给定n的值，打印箭头图案。 例如：
null
Input : n = 5Output : * ** *** **** ***** **** *** ** *Input : n = 7Output : * ** *** **** ***** ****** ******* ****** ***** **** *** ** *
下面是打印箭头图案的程序：
C++
// C++ program to print the // arrow pattern #include <bits/stdc++.h> using namespace std; // Function to print pattern void print_arrow( int n) { // for printing upper part // of the arrow for ( int i = 1; i < n; i++) { // To give space before printing // stars in upper part of arrow for ( int j = 0; j < i; j++) { cout << " " ; } // To print stars in upper // part of the arrow for ( int k = 0; k < i; k++) { cout << "*" ; } cout << "" ; } // for printing lower part // of the arrow for ( int i = 0; i < n; i++) { // To give space before printing // stars in lower part of arrow for ( int j = 0; j < n - i; j++) { cout << " " ; } // To print stars in lower // part of the arrow for ( int k = 0; k < n - i; k++) { cout << "*" ; } cout << "" ; } } // Driver code int main() { // taking input from user int n = 5; // function calling print_arrow(n); return 0; } |
JAVA
// Java program to print the // arrow pattern import java.io.*; class GFG { // Function to print pattern static void print_arrow( int n) { // for printing upper part // of the arrow for ( int i = 1 ; i < n; i++) { // To give space before printing // stars in upper part of arrow for ( int j = 0 ; j < i; j++) { System.out.print( " " ); } // To print stars in upper // part of the arrow for ( int k = 0 ; k < i; k++) { System.out.print( "*" ); } System.out.println(); } // for printing lower part // of the arrow for ( int i = 0 ; i < n; i++) { // To give space before printing // stars in lower part of arrow for ( int j = 0 ; j < n - i; j++) { System.out.print( " " ); } // To print stars in lower // part of the arrow for ( int k = 0 ; k < n - i; k++) { System.out.print( "*" ); } System.out.println(); } } public static void main (String[] args) { // taking input from user int n = 5 ; // function calling print_arrow(n); } } // This code is contributed by Gitanjali. |
Python3
# Python program to print the # arrow pattern import math # Function to print pattern def print_arrow(n): # for printing upper part # of the arrow for i in range ( 1 ,n): # To give space before printing # stars in upper part of arrow for j in range ( 0 ,i): print ( " " ,end = "") # To print stars in upper # part of the arrow for k in range ( 0 ,i): print ( "*" ,end = "") print () # for printing lower part # of the arrow for i in range ( 0 ,n): # To give space before printing # stars in lower part of arrow for j in range ( 0 ,n - i): print ( " " ,end = "") # To print stars in lower # part of the arrow for k in range ( 0 ,n - i): print ( "*" ,end = "") print () #driver code n = 5 # function calling print_arrow(n) # This code is contributed by Gitanjali. |
C#
// C# program to print // the arrow pattern using System; class GFG { // Function to print pattern static void print_arrow( int n) { // for printing upper // part of the arrow for ( int i = 1; i < n; i++) { // To give space before printing // stars in upper part of arrow for ( int j = 0; j < i; j++) { Console.Write( " " ); } // To print stars in upper // part of the arrow for ( int k = 0; k < i; k++) { Console.Write( "*" ); } Console.WriteLine(); } // for printing lower // part of the arrow for ( int i = 0; i < n; i++) { // To give space before printing // stars in lower part of arrow for ( int j = 0; j < n - i; j++) { Console.Write( " " ); } // To print stars in lower // part of the arrow for ( int k = 0; k < n - i; k++) { Console.Write( "*" ); } Console.WriteLine(); } } // Driver code public static void Main() { // taking input from user int n = 5; // function calling print_arrow(n); } } // This code is contributed by vt_m. |
PHP
<?php // PHP implementation to print // the arrow pattern // Function to print pattern function print_arrow( $n ) { // for printing upper part // of the arrow for ( $i = 1; $i < $n ; $i ++) { // To give space before printing // stars in upper part of arrow for ( $j = 0; $j < $i ; $j ++) { echo " " ; } // To print stars in upper // part of the arrow for ( $k = 0; $k < $i ; $k ++) { echo "*" ; } echo "" ; } // for printing lower part // of the arrow for ( $i = 0; $i < $n ; $i ++) { // To give space before printing // stars in lower part of arrow for ( $j = 0; $j < $n - $i ; $j ++) { echo " " ; } // To print stars in lower // part of the arrow for ( $k = 0; $k < $n - $i ; $k ++) { echo "*" ; } echo "" ; } } // Driver code $n = 5; print_arrow( $n ); // This code is contributed by Mithun Kumar ?> |
Javascript
<script> // JavaScript program to print the // arrow pattern // Function to print pattern function print_arrow(n) { // for printing upper part // of the arrow for ( var i = 1; i < n; i++) { // To give space before printing // stars in upper part of arrow for ( var j = 0; j < i; j++) { document.write( " " ); } // To print stars in upper // part of the arrow for ( var k = 0; k < i; k++) { document.write( "*" ); } document.write( "<br>" ); } // for printing lower part // of the arrow for ( var i = 0; i < n; i++) { // To give space before printing // stars in lower part of arrow for ( var j = 0; j < n - i; j++) { document.write( " " ); } // To print stars in lower // part of the arrow for ( var k = 0; k < n - i; k++) { document.write( "*" ); } document.write( "<br>" ); } } // Driver code // taking input from user var n = 5; // function calling print_arrow(n); </script> |
输出：
* ** *** **** ***** **** *** ** *
另一种方法：
C++
// C++ program to print the // arrow pattern #include <iostream> #include<stdlib.h> using namespace std; class gfg { public : void print_arrow( int n) { // Total no of rows for ( int i = 0; i < n + n - 1; i++) { int size = i; if (i >= n) { size = n + n - i - 2; } // cols in each row for ( int j = 0; j <= size + size; j++) { if (j < size) // For printing space { cout<< " " ; } else // For printing * { cout<< "*" ; } } cout<< "" ; } } }; // Driver code int main() { gfg g; // taking input from user int n = 5; // function calling g.print_arrow(n); return 0; } |
C
// C program to print the // arrow pattern #include <stdio.h> #include<stdlib.h> void print_arrow( int n) { // Total no of rows for ( int i = 0; i < n + n - 1; i++) { int size = i; if (i >= n) { size = n + n - i - 2; } // cols in each row for ( int j = 0; j <= size + size; j++) { if (j < size) // For printing space { printf ( " " ); } else // For printing * { printf ( "*" ); } } printf ( "" ); } } // Driver code int main() { // taking input from user int n = 5; // function calling print_arrow(n); return 0; } |
JAVA
// Java program to print the // arrow pattern class GFG { static void print_arrow( int n) { // Total no of rows for ( int i = 0 ; i < n + n - 1 ; i++) { int size = i; if (i >= n) { size = n + n - i - 2 ; } // cols in each row for ( int j = 0 ; j <= size + size; j++) { if (j < size) // For printing space { System.out.print( " " ); } else // For printing * { System.out.print( "*" ); } } System.out.print( "" ); } } // Driver code public static void main(String args[]) { // taking input from user int n = 5 ; // function calling print_arrow(n); } } // This code is contributed // by Akanksha Rai |
Python3
# Python 3 program to print the # arrow pattern def print_arrow(n): # Total no of rows for i in range (n + n - 1 ): size = i if i > = n: size = n + n - i - 2 # cols in each row for j in range (size + size): if j < size: # For printing space print ( ' ' , end = '') else : # For printing * print ( '*' , end = '') print () # Driver code # taking input from user n = 5 # function calling print_arrow(n) # This code is contributed # by SamyuktaSHegde. |
C#
// C# program to print the // arrow pattern using System; class GFG { static void print_arrow( int n) { // Total no of rows for ( int i = 0; i < n + n - 1; i++) { int size = i; if (i >= n) { size = n + n - i - 2; } // cols in each row for ( int j = 0; j <= size + size; j++) { if (j < size) // For printing space { Console.Write( " " ); } else // For printing * { Console.Write( "*" ); } } Console.Write( "" ); } } // Driver code public static void Main() { // taking input from user int n = 5; // function calling print_arrow(n); } } // This code is contributed // by Akanksha Rai |
Javascript
<script> // javascript program to print the // arrow pattern function print_arrow(n) { // Total no of rows for ( var i = 0; i < n + n - 1; i++) { var size = i; if (i >= n) { size = n + n - i - 2; } // cols in each row for ( var j = 0; j <= size + size; j++) { if (j < size) // For printing space { document.write( " " ); } else // For printing * { document.write( "*" ); } } document.write( "<br>" ); } } // Driver code // taking input from user var n = 5; // function calling print_arrow(n); // This code is contributed by Princi Singh </script> |
输出：
* ** *** **** ***** **** *** ** *
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