#include <unistd.h>
void    ft_swap( int    *a, int *b)
{
        a = b + a;
        b = b - a;
        a = a - b;
}


int main() {
    int a = 49;
    int b = 50;
    write(1, &a, 1);
    write(1,":",1);
    write(1, &b, 1);
    write(1,"\n",1);

    ft_swap( a, b);
    
    return 0;
}