打印左右箭头图案的程序-yiteyi-C++库

写入程序以打印由星星组成的右箭头图案和左箭头图案。输入是一个奇数n，表示要打印的图案的高度和宽度。 例如：

null

Input : n = 9Output :    *     *                     *         **********       *      *     *    *    *   *  * ********** *   *   *    *Input : n = 7Output :   *    *     ********     *    *   *   *  * ******** *  *   *

推荐：请尝试你的方法 {IDE} 首先，在进入解决方案之前。

C++

                         // C++ program to print Pyramid pattern                       
                         #include <iostream>                       
                         using                                     namespace                                     std;                       
           
                         // function to print right arrow pattern                       
                         void                                     rightpattern(                                     int                                     n)                       
                         {                       
                                                 // for printing upper portion                       
                                                 int                                     c1 = (n - 1) / 2;                       
           
                                                 // for printing lower portion                       
                                                 int                                     c2 = 3 * n / 2 - 1;                       
           
                                                 for                                     (                                     int                                     i = 0; i < n; i++) {                       
                                                 for                                     (                                     int                                     j = 0; j < n; j++) {                       
           
                                                 // checking conditions to print right arrow                       
                                                 if                                     (j - i == c1 || i + j == c2 || i == c1)                       
                                                 cout <<                                     "*"                                     ;                       
           
                                                 // otherwise print space                       
                                                 else                       
                                                 cout <<                                     " "                                     ;                       
                                                 }                       
                                                 // for jumping to next line                       
                                                 cout <<                                     ""                                     ;                       
                                                 }                       
                         }                       
           
                         // function to print left arrow pattern                       
                         void                                     leftpattern(                                     int                                     n)                       
                         {                       
                                                 char                                     s =                                     ' '                                     ;                       
                                                 char                                     st =                                     '*'                                     ;                       
           
                                                 // for printing upper part                       
                                                 for                                     (                                     int                                     i = (n - 1) / 2; i > 0; i--)                       
                                                 cout << string(i, s) << st << endl;                       
           
                                                 // for printing middle part                       
                                                 for                                     (                                     int                                     i = 0; i < n; i++)                       
                                                 cout <<                                     "*"                                     ;                       
                                                 cout << endl;                       
           
                                                 // for printing lower part                       
                                                 for                                     (                                     int                                     i = 1; i <= (n - 1) / 2; i++)                       
                                                 cout << string(i, s) << st << endl;                       
                                                 cout << endl;                       
                         }                       
           
                         // Driver program                       
                         int                                     main()                       
                         {                       
                                                 int                                     n = 9;                                     // Must be odd                       
           
                                                 // function calling to print right arrow                       
                                                 rightpattern(n);                       
           
                                                 cout << endl  << endl;                       
           
                                                 // function calling to print left arrow                       
                                                 leftpattern(n);                       
           
                                                 return                                     0;                       
                         }                       

JAVA

                         // Java program to print Pyramid pattern                       
                         class                                     GFG                       
                         {                       
           
                         // function to print right arrow pattern                       
                         static                                     void                                     rightpattern(                                     int                                     n)                       
                         {                       
                                                 // for printing upper portion                       
                                                 int                                     c1 = (n -                                     1                                     ) /                                     2                                     ;                       
           
                                                 // for printing lower portion                       
                                                 int                                     c2 =                                     3                                     * n /                                     2                                     -                                     1                                     ;                       
           
                                                 for                                     (                                     int                                     i =                                     0                                     ; i < n; i++)                       
                                                 {                       
                                                 for                                     (                                     int                                     j =                                     0                                     ; j < n; j++)                       
                                                 {                       
           
                                                 // checking conditions to print                       
                                                 // right arrow                       
                                                 if                                     (j - i == c1 ||                       
                                                 i + j == c2 || i == c1)                       
                                                 {                       
                                                 System.out.print(                                     "*"                                     );                       
                                                 }                                     // otherwise print space                       
                                                 else                       
                                                 {                       
                                                 System.out.print(                                     " "                                     );                       
                                                 }                       
                                                 }                       
                                                 // for jumping to next line                       
                                                 System.out.print(                                     ""                                     );                       
                                                 }                       
                         }                       
           
                         static                                     void                                     string(                                     int                                     n)                       
                         {                       
                                                 for                                     (                                     int                                     i = n; i >                                     0                                     ; i--)                       
                                                 {                       
                                                 System.out.print(                                     " "                                     );                       
                                                 }                       
                         }                       
           
                         // function to print left arrow pattern                       
                         static                                     void                                     leftpattern(                                     int                                     n)                       
                         {                       
                                                 char                                     s =                                     ' '                                     ;                       
                                                 char                                     st =                                     '*'                                     ;                       
           
                                                 // for printing upper part                       
                                                 for                                     (                                     int                                     i = (n -                                     1                                     ) /                                     2                                     ; i >                                     0                                     ; i--)                       
                                                 {                       
                                                 string(i);                       
                                                 System.out.println(st);                       
                                                 }                       
                                   
                                                 // for printing middle part                       
                                                 for                                     (                                     int                                     i =                                     0                                     ; i < n; i++)                       
                                                 {                       
                                                 System.out.print(                                     "*"                                     );                       
                                                 }                       
                                                 System.out.println();                       
           
                                                 // for printing lower part                       
                                                 for                                     (                                     int                                     i =                                     1                                     ; i <= (n -                                     1                                     ) /                                     2                                     ; i++)                       
                                                 {                       
                                                 string(i);                       
                                                 System.out.println(st);                       
                                                 }                       
                                                 System.out.println();                       
                         }                       
           
                         // Driver Code                       
                         public                                     static                                     void                                     main(String args[])                       
                         {                       
                                                 int                                     n =                                     9                                     ;                                     // Must be odd                       
           
                                                 // function calling to print                       
                                                 // right arrow                       
                                                 rightpattern(n);                       
           
                                                 System.out.println(                                     ""                                     );                       
           
                                                 // function calling to print                       
                                                 // left arrow                       
                                                 leftpattern(n);                       
                         }                       
                         }                       
           
                         // This code is contributed                       
                         // by PrinciRaj1992                       

Python3

                         # Python3 program to print Pyramid pattern                       
           
                         # function to print right arrow pattern                       
                         def                                     rightpattern(n):                       
                                   
                                                 # for printing upper portion                       
                                                 c1                                     =                                     (n                                     -                                     1                                     )                                     /                                     /                                     2                                     ;                       
           
                                                 # for printing lower portion                       
                                                 c2                                     =                                     3                                     *                                     n                                     /                                     /                                     2                                     -                                     1                                     ;                       
           
                                                 for                                     i                                     in                                     range                                     (n):                       
           
                                                 for                                     j                                     in                                     range                                     (n):                       
           
                                                 # checking conditions to print                       
                                                 # right arrow                       
                                                 if                                     (j                                     -                                     i                                     =                                     =                                     c1                                     or                       
                                                 i                                     +                                     j                                     =                                     =                                     c2                                     or                                     i                                     =                                     =                                     c1):                       
           
                                                 print                                     (                                     "*"                                     , end                                     =                                     "");                       
                                   
                                                 # otherwise print space                       
                                                 else                                     :                       
           
                                                 print                                     (                                     " "                                     , end                                     =                                     "");                       
           
                                                 # for jumping to next line                       
                                                 print                                     ();                       
           
                         def                                     string(n):                       
           
                                                 for                                     i                                     in                                     range                                     (n):                       
                                                 print                                     (                                     " "                                     , end                                     =                                     "");                       
           
                         # function to print left arrow pattern                       
                         def                                     leftpattern(n):                       
           
                                                 s                                     =                                     ' '                                     ;                       
                                                 st                                     =                                     '*'                                     ;                       
           
                                                 # for printing upper part                       
                                                 for                                     i                                     in                                     range                                     ((n                                     -                                     1                                     )                                     /                                     /                                     2                                     ,                                     0                                     ,                                     -                                     1                                     ):                       
                                                 string(i);                       
                                                 print                                     (st);                       
           
                                                 # for printing middle part                       
                                                 for                                     i                                     in                                     range                                     (n):                       
                                                 print                                     (                                     "*"                                     , end                                     =                                     "");                       
           
                                                 print                                     ();                       
           
                                                 # for printing lower part                       
                                                 for                                     i                                     in                                     range                                     (                                     1                                     , ((n                                     -                                     1                                     )                                     /                                     /                                     2                                     )                                     +                                     1                                     ):                       
                                                 string(i);                       
                                                 print                                     (st);                       
           
                                                 print                                     ();                       
           
                         # Driver Code                       
                         if                                     __name__                                     =                                     =                                     '__main__'                                     :                       
                                                 n                                     =                                     9                                     ;                                     # Must be odd                       
           
                                                 # function calling to print                       
                                                 # right arrow                       
                                                 rightpattern(n);                       
           
                                                 print                                     ("");                       
           
                                                 # function calling to print                       
                                                 # left arrow                       
                                                 leftpattern(n);                       
           
                         # This code is contributed by PrinciRaj1992                       

C#

                         // C# program to print Pyramid pattern                       
                         using                                     System;                       
           
                         class                                     GFG                       
                         {                       
           
                         // function to print right arrow pattern                       
                         static                                     void                                     rightpattern(                                     int                                     n)                       
                         {                       
                                                 // for printing upper portion                       
                                                 int                                     c1 = (n - 1) / 2;                       
           
                                                 // for printing lower portion                       
                                                 int                                     c2 = 3 * n / 2 - 1;                       
           
                                                 for                                     (                                     int                                     i = 0; i < n; i++)                       
                                                 {                       
                                                 for                                     (                                     int                                     j = 0; j < n; j++)                       
                                                 {                       
           
                                                 // checking conditions to print                       
                                                 // right arrow                       
                                                 if                                     (j - i == c1 ||                       
                                                 i + j == c2 || i == c1)                       
                                                 {                       
                                                 Console.Write(                                     "*"                                     );                       
                                                 }                                     // otherwise print space                       
                                                 else                       
                                                 {                       
                                                 Console.Write(                                     " "                                     );                       
                                                 }                       
                                                 }                       
                                                 // for jumping to next line                       
                                                 Console.Write(                                     ""                                     );                       
                                                 }                       
                         }                       
           
                         static                                     void                                     String(                                     int                                     n)                       
                         {                       
                                                 for                                     (                                     int                                     i = n; i > 0; i--)                       
                                                 {                       
                                                 Console.Write(                                     " "                                     );                       
                                                 }                       
                         }                       
           
                         // function to print left arrow pattern                       
                         static                                     void                                     leftpattern(                                     int                                     n)                       
                         {                       
                                                 char                                     s =                                     ' '                                     ;                       
                                                 char                                     st =                                     '*'                                     ;                       
           
                                                 // for printing upper part                       
                                                 for                                     (                                     int                                     i = (n - 1) / 2; i > 0; i--)                       
                                                 {                       
                                                 String(i);                       
                                                 Console.WriteLine(st);                       
                                                 }                       
                                   
                                                 // for printing middle part                       
                                                 for                                     (                                     int                                     i = 0; i < n; i++)                       
                                                 {                       
                                                 Console.Write(                                     "*"                                     );                       
                                                 }                       
                                                 Console.WriteLine();                       
           
                                                 // for printing lower part                       
                                                 for                                     (                                     int                                     i = 1; i <= (n - 1) / 2; i++)                       
                                                 {                       
                                                 String(i);                       
                                                 Console.WriteLine(st);                       
                                                 }                       
                                                 Console.WriteLine();                       
                         }                       
           
                         // Driver Code                       
                         public                                     static                                     void                                     Main()                       
                         {                       
                                                 int                                     n = 9;                                     // Must be odd                       
           
                                                 // function calling to print                       
                                                 // right arrow                       
                                                 rightpattern(n);                       
           
                                                 Console.WriteLine(                                     ""                                     );                       
           
                                                 // function calling to print                       
                                                 // left arrow                       
                                                 leftpattern(n);                       
                         }                       
                         }                       
           
                         // This code is contributed                       
                         // by Akanksha Rai                       

PHP

                         <?php                       
           
                         // function to print right arrow pattern                       
                         function                                     rightpattern(                                     $n                                     )                       
                         {                       
                                   
                                                 // for printing upper portion                       
                                                 $c1                                     = (                                     $n                                     - 1) / 2;                       
           
                                                 // for printing lower portion                       
                                                 $c2                                     =                                     floor                                     (3 *                                     $n                                     / 2 - 1);                       
           
                                                 for                                     (                                     $i                                     = 0;                                     $i                                     <                                     $n                                     ;                                     $i                                     ++)                       
                                                 {                       
                                                 for                                     (                                     $j                                     = 0;                                     $j                                     <                                     $n                                     ;                                     $j                                     ++)                       
                                                 {                       
           
                                                 // checking conditions to                       
                                                 // print right arrow                       
                                                 if                                     ((                                     $j                                     -                                     $i                                     ) ==                                     $c1                                     ||                       
                                                 (                                     $i                                     +                                     $j                                     ) ==                                     $c2                                     ||                       
                                                 $i                                     ==                                     $c1                                     )                       
                                                 echo                                     "*"                                     ;                       
           
                                                 // otherwise print space                       
                                                 else                       
                                                 echo                                     " "                                     ;                       
                                                 }                       
                                   
                                                 // for jumping to next line                       
                                                 echo                                     ""                                     ;                       
                                                 }                       
                         }                       
           
                         // function to print left arrow pattern                       
                         function                                     leftpattern(                                     $n                                     )                       
                         {                       
                                                 $s                                     =                                     ' '                                     ;                       
                                                 $st                                     =                                     '*'                                     ;                       
           
                                                 // for printing upper part                       
                                                 for                                     (                                     $i                                     = (                                     $n                                     - 1) / 2;                                     $i                                     > 0;                                     $i                                     --)                       
                                                 {                       
                                                 for                                     (                                     $j                                     = 0;                                     $j                                     <                                     $i                                     ;                                     $j                                     ++)                       
                                                 echo                                     " "                                     ;                       
                                                 echo                                     $st                                     .                                     ""                                     ;                       
                                                 }                       
                                   
                                                 // for printing middle part                       
                                                 for                                     (                                     $i                                     = 0;                                     $i                                     <                                     $n                                     ;                                     $i                                     ++)                       
                                                 echo                                     "*"                                     ;                       
                                                 echo                                     ""                                     ;                       
           
                                                 // for printing lower part                       
                                                 for                                     (                                     $i                                     = 1;                                     $i                                     <= (                                     $n                                     - 1) / 2;                                     $i                                     ++)                       
                                                 {                       
                                                 for                                     (                                     $j                                     = 0;                                     $j                                     <                                     $i                                     ;                                     $j                                     ++)                       
                                                 echo                                     " "                                     ;                       
                                                 echo                                     $st                                     .                                     ""                                     ;                       
                                                 }                       
                                                 echo                                     ""                                     ;                       
                         }                       
           
                                                 // Driver Code                       
                                                 $n                                     = 9;                                     // Must be odd                       
           
                                                 // function calling to                       
                                                 // print right arrow                       
                                                 rightpattern(                                     $n                                     );                       
           
                                                 echo                                     ""                                     ;                       
           
                                                 // function calling to                       
                                                 // print left arrow                       
                                                 leftpattern(                                     $n                                     );                       
           
           
                         // This code is contributed by mits                       
           
                         ?>                       

Javascript

                         <script>                       
           
                                                 // function to print right arrow pattern                       
                                                 function                                     rightpattern(n) {                       
                                                 // for printing upper portion                       
                                                 var                                     c1 = (n - 1) / 2;                       
           
                                                 // for printing lower portion                       
                                                 var                                     c2 = Math.floor((3 * n) / 2 - 1);                       
           
                                                 for                                     (                                     var                                     i = 0; i < n; i++) {                       
                                                 for                                     (                                     var                                     j = 0; j < n; j++) {                       
                                                 // checking conditions to                       
                                                 // print right arrow                       
                                                 if                                     (j - i === c1 || i + j === c2                       
                                                 || i === c1)                       
                                                 document.write(                                     "*"                                     );                       
                                                 // otherwise print space                       
                                                 else                       
                                                 document.write(                                     "  "                                     );                       
                                                 }                       
           
                                                 // for jumping to next line                       
                                                 document.write(                                     "<br>"                                     );                       
                                                 }                       
                                                 }                       
           
                                                 // function to print left                       
                                                 // arrow pattern                       
                                                 function                                     leftpattern(n) {                       
                                                 var                                     s =                                     " "                                     ;                       
                                                 var                                     st =                                     "*"                                     ;                       
           
                                                 // for printing upper part                       
                                                 for                                     (                                     var                                     i = (n - 1) / 2; i > 0; i--) {                       
                                                 for                                     (                                     var                                     j = 0; j < i; j++)                       
                                                 document.write(                                     "  "                                     );                       
                                                 document.write(st +                                     "<br>"                                     );                       
                                                 }                       
           
                                                 // for printing middle part                       
                                                 for                                     (                                     var                                     i = 0; i < n; i++)                       
                                                 document.write(                                     "*"                                     );                       
                                                 document.write(                                     "<br>"                                     );                       
           
                                                 // for printing lower part                       
                                                 for                                     (                                     var                                     i = 1; i <= (n - 1) / 2; i++)                       
                                                 {                       
                                                 for                                     (                                     var                                     j = 0; j < i; j++)                       
                                                 document.write(                                     "  "                                     );                       
                                                 document.write(st +                                     "<br>"                                     );                       
                                                 }                       
                                                 document.write(                                     "<br>"                                     );                       
                                                 }                       
           
                                                 // Driver Code                       
                                                 var                                     n = 9;                                     // Must be odd                       
                                                 // function calling to                       
                                                 // print right arrow                       
                                                 rightpattern(n);                       
                                                 document.write(                                     "<br><br>"                                     );                       
                                                 // function calling to                       
                                                 // print left arrow                       
                                                 leftpattern(n);                       
                                   
                         </script>                       

输出：

    *     *                     *         **********       *      *     *    *    *   *  * ********** *  *   *    *

时间复杂性： O（n^2）

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