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

// RIGHT

void swap(int* a_n1, int* a_n2) {
    int copy_of_n1 = *a_n1;
    *a_n1 = *a_n2;  // store the value at address a_n2 at address a_n1.
    *a_n2 = copy_of_n1;  // store copy_of_n1 at address a_n2.
}

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

    swap(&x, &y);
    printf("swap(&x, &y);\n");
    printf("x == %d    y == %d\n", x, y);

    return EXIT_SUCCESS;
}
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