#include <stdio.h> #include <conio.h> #include <stdlib.h>

int add(int a, int b) { return a + b; }

int sub(int a, int b) { return a - b; }

int mul(int a, int b) { return a * b; }

int div(int a, int b) { return a / b; }

int main() { int num1, num2, choice;

printf("[0] Exit\v[1] Add\v[2] Subtract\v[3] Multiply\v[4] Divide");
scanf("%d", &choice);

int(*f)(int, int);
switch (choice)
{
case 0:
    return 0;
    break;

case 1:
    f = &add;
    break;

case 2:
    f = ⊂
    break;

case 3:
    f = &mul;
    break;

case 4:
    f = ÷
    break;

default:
    printf("That is not a valid choice.");
    return 0;
}

printf("Enter 1st number:\n");
scanf("%d", &num1);
printf("Enter 2nd number:\n");
scanf("%d", &num2);

printf("%d", f(num1, num2));

}