求圆面积的程序-yiteyi-C++库

                         // C++ program to find area                       
                         // of circle                       
                         #include <iostream>                       
                         const                                     double                                     pi = 3.14159265358979323846;                       
                         using                                     namespace                                     std;                       
           
                         // function to calculate the area of circle                       
                         float                                     findArea(                                     float                                     r)                       
                         {                       
                                                 return                                     (pi * r * r);                       
                         }                       
                         // driver code                       
                         int                                     main()                       
                         {                       
                                                 float                                     r, Area;                       
                                                 r = 5;                       
           
                                                 // function calling                       
                                                 Area = findArea(r);                       
                                                 // displaying the area                       
                                                 cout <<                                     "Area of Circle is :"                                     << Area;                       
                                                 return                                     0;                       
                         }                       

                         // C program to find area                       
                         // of circle                       
                         #include <stdio.h>                       
                         #include <math.h>                       
                         #define PI 3.142                       
           
                         double                                     findArea(                                     int                                     r)                       
                         {                       
                                                 return                                     PI *                                     pow                                     (r, 2);                       
                         }                       
           
                         int                                     main()                       
                         {                       
                                                 printf                                     (                                     "Area is %f"                                     , findArea(5));                       
                                                 return                                     0;                       
                         }                       

                         // Java program to find area                       
                         // of circle                       
                                   
                         class                                     Test                       
                         {                       
                                                 static                                     final                                     double                                     PI = Math.PI;                       
                                   
                                                 static                                     double                                     findArea(                                     int                                     r)                       
                                                 {                       
                                                 return                                     PI * Math.pow(r,                                     2                                     );                       
                                                 }                       
                                   
                                                 // Driver method                       
                                                 public                                     static                                     void                                     main(String[] args)                       
                                                 {                       
                                                 System.out.println(                                     "Area is "                                     +  findArea(                                     5                                     ));                       
                                                 }                       
                         }                       

                         # Python3 program to find Area of a circle                       
           
                         def                                     findArea(r):                       
                                                 PI                                     =                                     3.142                       
                                                 return                                     PI                                     *                                     (r                                     *                                     r);                       
           
                         # Driver method                       
                         print                                     (                                     "Area is %.6f"                                     %                                     findArea(                                     5                                     ));                       
           
                         # This code is contributed by Chinmoy Lenka                       

                         // C# program to find area of circle                       
                         using                                     System;                       
           
                         class                                     GFG                       
                         {                       
                                                 static                                     double                                     PI = Math.PI;                       
                                   
                                                 static                                     double                                     findArea(                                     int                                     r)                       
                                                 {                       
                                                 return                                     PI * Math.Pow(r, 2);                       
                                                 }                       
                                   
                                                 // Driver method                       
                                                 static                                     void                                     Main()                       
                                                 {                       
                                                 Console.Write(                                     "Area is "                                     + findArea(5));                       
                                                 }                       
                         }                       
           
                         // This code is contributed by Sam007.                       

                         <?php                       
                         // PHP program to find area                       
                         // of circle                       
                                   
                         function                                     findArea(                                     $r                                     )                       
                         {                       
                                                 $PI                                     =3.142;                       
                                                 return                                     $PI                                     * pow(                                     $r                                     , 2);                       
                         }                       
                                   
                         // Driver Code                       
                         echo                                     (                                     "Area is "                                     );                       
                         echo                                     (findArea(5));                       
                         return                                     0;                       
           
                         // This code is contributed by vt_m.                       
                         ?>                       

                         <script>                       
           
                         // Javascript program to find area                       
                         // of circle                       
           
                         let pi = 3.14159265358979323846;                       
           
                         // function to calculate the area of circle                       
                         function                                     findArea(r)                       
                         {                       
                                                 return                                     (pi * r * r);                       
                         }                       
           
                         // Driver code                       
                                                 let r, Area;                       
                                                 r = 5;                       
           
                                                 // function calling                       
                                                 Area = findArea(r);                       
                                   
                                                 // displaying the area                       
                                                 document.write(                                     "Area of Circle is :"                                     + Area);                       
                                   
                         // This code is contributed by Mayank Tyagi                       
           
                         </script>                       

求圆面积的程序

C++

C

JAVA

Python3

C#

PHP

Javascript