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

#define log_int(n) printf("%s == %d\n", #n, (n))
#define log_addr(n) printf("%s == %p\n", #n, (void*)(n))

// when working with value types, a function just receives
// a copy of the value
// so this function does nothing useful
void swap(int left, int right) {
    log_int(left);
    log_int(right);
    int old_left = left;
    left = right;
    right = old_left;
    log_int(left);
    log_int(right);
}

int main(int argc, char* argv[]) {
    int num1 = 10;
    int num2 = 5;

    log_int(num1);
    log_int(num2);
    swap(num1, num2);
    log_int(num1);
    log_int(num2);
    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */