#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

#define log_int(n) printf("%s == %d\n", #n, n)

int add(int left, int right) {
    return left + right;
}

int subtract(int left, int right) {
    return left - right;
}

int main(int argc, char* argv[]) {
    int (*binary_operator)(int, int) = add;

    log_int(add(5, 7));
    log_int(binary_operator(5, 7));

    binary_operator = subtract;
    log_int(subtract(5, 7));
    log_int(binary_operator(5, 7));

    printf("%p\n", (void*)&argc);
    printf("%p\n", (void*)(long int)binary_operator);

    return EXIT_SUCCESS;
}
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