Function Pointer Dispatch Table

Code

#include <stdio.h>
typedef enum {
    ADD = 0,
    SUB,
    MUL,
    DEVIDE,
    INVALID
}COMMANDS;

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
    int (*fptr)(int, int);
    if(cmd < INVALID){
        switch (cmd){
            case ADD:
            fptr =&add;
            return fptr(a,b);
            break;
            case SUB:
            fptr =&sub;
            return fptr(a,b);
            break;
            case MUL:
            fptr =&mul;
            return fptr(a,b);
            break;
            case DEVIDE:
            fptr =&divide;
            return fptr(a,b);
            break;
        }
    }

    return 0;
}
/*SOLUTION BY ARRAY POINTER
int execute_command(int a, int b, int cmd) {
    
    int (*func_arr[])(int, int) = { add, sub, mul, divide };
    if (cmd >= 0 && cmd < 4) {
        return func_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