// C equivalent
#include <stdio.h>

void swap(int* x, int* y)
{
    auto const tmp = *x;
    *x = *y;
    *y = tmp;
}

int main()
{
    int i = 1;
    int j = 2;
    printf("%d %d\n", i, j);
    swap(&i, &j);
    printf("%d %d\n", i, j);
}