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) {
    // Your logic here using function pointer array
    //definition of function pointer
    typedef int(*func_t)(int, int);
    func_t func_lib[4] = {add,sub,mul,divide};
    if(cmd<0 && cmd>3){
        printf("Invalid command operation\n.");
        return -1;
    }
    if(cmd == 3 && b == 0){
        printf("Division by Zero\n");
        return -2;
    }

    return func_lib[cmd](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