#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#define print_int_expr_and_value(n)  printf("%s == %d\n", (#n), (n))
// swap(…) - CORRECT

void swap(int* a_lhs, int* a_rhs) {
    int lhs = *a_lhs;   // *a_lhs means "value at (address) a_lhs
    int rhs = *a_rhs;   // *a_rhs means "value at (address) a_rhs
    *a_lhs = rhs;
    *a_rhs = lhs;
}

int main(int argc, char* argv[]) {
    int n1 =   3;
    int n2 = 100;
    print_int_expr_and_value(n1);
    print_int_expr_and_value(n2);

    swap(&n1, &n2);
    printf("Called swap(&n1, &n2)\n");

    print_int_expr_and_value(n1);
    print_int_expr_and_value(n2);
    return EXIT_SUCCESS;
}
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