swap.c

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#include <stdio.h>

void swap(int *x, int *y)
{
    printf("Memory addresses of x and y: %p, %p\n", &x, &y);
    printf("Memory addresses of a and b: %p, %p\n", x, y);
    int a_copy = *x;
    int b_copy = *y;
    *y = a_copy;
    *x = b_copy;
    // when this exits, 'a' and 'b' here will disappear
    // remember: we can't return stuff we create inside here
    // (with one exception we'll talk about later!)
}

int main(void)
{
    int a = 3;
    int b = 8;               
    printf("%d, %d\n", a, b);
    printf("Memory addresses of a and b: %p, %p\n", &a, &b);
    swap(&a, &b);             
    printf("%d, %d\n", a, b);
        
    return 0;
}