56. Function Pointer Dispatch Table

#include <stdio.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 divide(int a, int b) { return a / b; }
typedef int(* ptr) (int,int);
int execute_command(int a, int b, int cmd) {
 ptr arr[4]={&add,&sub,&mul,&divide};
 return arr[cmd](a,b);
   return 0;
}

int main() {
    int a, b, cmd;
    scanf("%d %d %d", &a, &b, &cmd);

    int result = execute_command(a, b, cmd);
    printf("%d", result);

    return 0;
}

Solving Approach