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  1. #include <stdio.h>
  2.  
  3. void add(double number1, double number2)
  4. {
  5.     printf("\nAddition\n");
  6.     printf("%.2f + %.2f = %.2f\n",
  7.            number1,
  8.            number2,
  9.            number1 + number2);
  10. }
  11.  
  12. void subtract(double number1, double number2)
  13. {
  14.     printf("\nSubtraction\n");
  15.     printf("%.2f - %.2f = %.2f\n",
  16.            number1,
  17.            number2,
  18.            number1 - number2);
  19. }
  20.  
  21. void multiply(double number1, double number2)
  22. {
  23.     printf("\nMultiplication\n");
  24.     printf("%.2f * %.2f = %.2f\n",
  25.            number1,
  26.            number2,
  27.            number1 * number2);
  28. }
  29.  
  30. void divide(double number1, double number2)
  31. {
  32.     printf("\nDivision\n");
  33.  
  34.     if (number2 == 0)
  35.     {
  36.         printf("Cannot divide by zero.\n");
  37.     }
  38.     else
  39.     {
  40.         printf("%.2f / %.2f = %.2f\n",
  41.                number1,
  42.                number2,
  43.                number1 / number2);
  44.     }
  45. }
  46.  
  47. int main(void)
  48. {
  49.     void (*operations[4])(double, double) =
  50.     {
  51.         add,
  52.         subtract,
  53.         multiply,
  54.         divide
  55.     };
  56.  
  57.     int choice;
  58.     double number1;
  59.     double number2;
  60.  
  61.     printf("Enter 0 to add\n");
  62.     printf("Enter 1 to subtract\n");
  63.     printf("Enter 2 to multiply\n");
  64.     printf("Enter 3 to divide\n");
  65.  
  66.     scanf("%d", &choice);
  67.  
  68.     if (choice < 0 || choice > 3)
  69.     {
  70.         printf("Invalid choice.\n");
  71.     }
  72.     else
  73.     {
  74.         printf("Enter two numbers: ");
  75.         scanf("%lf %lf", &number1, &number2);
  76.  
  77.         (*operations[choice])(number1, number2);
  78.     }
  79.  
  80.     return 0;
  81. }
  82.  
Success #stdin #stdout 0s 5312KB
comments (?)
stdin 
Standard input is empty
stdout 
Enter 0 to add
Enter 1 to subtract
Enter 2 to multiply
Enter 3 to divide
Invalid choice.
https://ideone.com/CNmxhK
language:
C (gcc 8.3)
created:
4 hours ago
visibility:
public

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