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  1. #include <stdio.h>
  2.  
  3. #define PI 3.141592653589793
  4.  
  5. void circumference(double r) {
  6.     printf("Circumference for radius %.2f = %.2f\n", r, 2 * PI * r);
  7. }
  8.  
  9. void area(double r) {
  10.     printf("Circle Area for radius %.2f = %.2f\n", r, PI * r * r);
  11. }
  12.  
  13. void volume(double r) {
  14.     printf("Sphere Volume for radius %.2f = %.2f\n", r, (4.0 / 3.0) * PI * r * r * r);
  15. }
  16.  
  17. int main(void) {
  18.     void (*calc[3])(double) = {circumference, area, volume};
  19.     int choice;
  20.     double radius;
  21.  
  22.     printf("Enter 0 for Circumference, 1 for Circle Area, 2 for Sphere Volume: ");
  23.     scanf("%d", &choice);
  24.  
  25.     if (choice >= 0 && choice <= 2) {
  26.         printf("Enter radius: ");
  27.         scanf("%lf", &radius);
  28.         (*calc[choice])(radius);
  29.     } else {
  30.         puts("Invalid choice.");
  31.     }
  32.     return 0;
  33. }
Success #stdin #stdout 0.01s 5308KB
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Standard input is empty
stdout
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Enter 0 for Circumference, 1 for Circle Area, 2 for Sphere Volume: Invalid choice.
https://ideone.com/tAryZ0
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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