#include <stdio.h>

typedef int (*fx)(void); // fx is pointer to function taking no parameters and returning int

int foo_1(void) { printf("%s\n", __func__); return 1; }
int foo_2(void) { printf("%s\n", __func__); return 2; }
int foo_three(void) { printf("%s\n", __func__); return 3; }

int main(void) {
    fx foo[3] = { foo_1, foo_2, foo_three };
    for (int k = 0; k < 3; k++) {
        printf("foo[%d]() returns %d\n", k, foo[k]());
    }
}