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 (*Add)(int, int) = add;
int (*Sub)(int, int) = sub;
int (*Mul)(int, int) = mul;
int (*Divide)(int, int) = divide;

int execute_command(int a, int b, int cmd) {
    switch (cmd) {
        case 0:
            return Add(a, b);
        case 1:
            return Sub(a, b);
        case 2:
            return Mul(a, b);
        case 3:
            if (b == 0) {
                printf("Cannot divide by zero\n");
                return 0;
            }
            return Divide(a, b);
        default:
            printf("Invalid command\n");
            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