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  1. #include <stdio.h>
  2.  
  3. #define PI 3.141592653589793
  4.  
  5. void circumference(double radius)
  6. {
  7.     double result = 2 * PI * radius;
  8.  
  9.     printf("\nCircle circumference\n");
  10.     printf("Radius = %.2f\n", radius);
  11.     printf("Circumference = %.2f\n", result);
  12. }
  13.  
  14. void circleArea(double radius)
  15. {
  16.     double result = PI * radius * radius;
  17.  
  18.     printf("\nCircle area\n");
  19.     printf("Radius = %.2f\n", radius);
  20.     printf("Area = %.2f\n", result);
  21. }
  22.  
  23. void sphereVolume(double radius)
  24. {
  25.     double result = (4.0 / 3.0) * PI * radius * radius * radius;
  26.  
  27.     printf("\nSphere volume\n");
  28.     printf("Radius = %.2f\n", radius);
  29.     printf("Volume = %.2f\n", result);
  30. }
  31.  
  32. int main(void)
  33. {
  34.     void (*calculations[3])(double) =
  35.     {
  36.         circumference,
  37.         circleArea,
  38.         sphereVolume
  39.     };
  40.  
  41.     int choice;
  42.     double radius;
  43.  
  44.     printf("Enter 0 to calculate circle circumference\n");
  45.     printf("Enter 1 to calculate circle area\n");
  46.     printf("Enter 2 to calculate sphere volume\n");
  47.  
  48.     scanf("%d", &choice);
  49.  
  50.     if (choice < 0 || choice > 2)
  51.     {
  52.         printf("Invalid choice.\n");
  53.     }
  54.     else
  55.     {
  56.         printf("Enter radius: ");
  57.         scanf("%lf", &radius);
  58.  
  59.         (*calculations[choice])(radius);
  60.     }
  61.  
  62.     return 0;
  63. }
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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Enter 0 to calculate circle circumference
Enter 1 to calculate circle area
Enter 2 to calculate sphere volume
Invalid choice.
https://ideone.com/0kXAtY
language:
C (gcc 8.3)
created:
5 hours ago
visibility:
public

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