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

void swap(int* a_n1, int* a_n2) {
    int temp = *a_n1;
    *a_n1 = *a_n2;
    *a_n2 = temp;
}

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

    swap(&a, &b);

    /* ****************** */

    printf("a == %d     b == %d   // before calling swap(…)\n", a, b);

    assert(a == 7);
    assert(b == 5);
    // Program will stop executing if conditions are false.
    // Use assert(…) only to check for BUGS in YOUR CODE,
    // i.e., things that must be true unless your code is BUGGY.
    // Do not use assert(…) to check for existance of files,
    // or appropriateness of parameters passed by other people's code.
    
    return EXIT_SUCCESS;
}
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