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  1. #include <stdio.h>
  2.  
  3. void add(double a, double b) {
  4.     printf("%.2f + %.2f = %.2f\n", a, b, a + b);
  5. }
  6.  
  7. void subtract(double a, double b) {
  8.     printf("%.2f - %.2f = %.2f\n", a, b, a - b);
  9. }
  10.  
  11. void multiply(double a, double b) {
  12.     printf("%.2f * %.2f = %.2f\n", a, b, a * b);
  13. }
  14.  
  15. void divide(double a, double b) {
  16.     if (b != 0) {
  17.         printf("%.2f / %.2f = %.2f\n", a, b, a / b);
  18.     } else {
  19.         puts("Error: Division by zero.");
  20.     }
  21. }
  22.  
  23. int main(void) {
  24.     void (*operations[4])(double, double) = {add, subtract, multiply, divide};
  25.     int choice;
  26.     double n1, n2;
  27.  
  28.     printf("Choose: 0 (Add), 1 (Subtract), 2 (Multiply), 3 (Divide): ");
  29.     scanf("%d", &choice);
  30.  
  31.     if (choice >= 0 && choice <= 3) {
  32.         printf("Enter two numbers: ");
  33.         scanf("%lf %lf", &n1, &n2);
  34.         (*operations[choice])(n1, n2);
  35.     } else {
  36.         puts("Invalid selection.");
  37.     }
  38.     return 0;
  39. }
Success #stdin #stdout 0.01s 5320KB
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Standard input is empty
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Choose: 0 (Add), 1 (Subtract), 2 (Multiply), 3 (Divide): Invalid selection.
https://ideone.com/IKTje3
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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