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

void bad_swap(int a, int b) {
    int copy_of_a = a;
    a = b;
    b = copy_of_a;
}

void swap(int* a_a, int* a_b) {
    int copy_of_a = *a_a;
    *a_a = *a_b;
    *a_b = copy_of_a;
}

int swap_dumb(int* a_a, int* a_b) {
    int copy_of_a = *a_a;
    *a_a = *a_b;
    return copy_of_a;
}

int main(int argc, char* argv[]) {
    int a = 5;
    int b = 7;
    printf("a == %d   b == %d\n", a, b);

    bad_swap(a, b);
    printf("a == %d   b == %d\n", a, b);
    
    //swap(&a, &b);
    b = swap_dumb(&a, &b);
    printf("a == %d   b == %d\n", a, b);

    return EXIT_SUCCESS;
}
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