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; }

int execute_command(int a, int b, int cmd) {
    int (*functions[4])(int,int) = {add,sub,mul,divide};
    if(cmd == 0)    return functions[0](a,b);
    else if(cmd == 1)    return functions[1](a,b);
    else if(cmd == 2)    return functions[2](a,b);
    else if(cmd == 3)    return functions[3](a,b);
}

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