/*
 * using pointers for function parameters
 */

#include <stdio.h>

void swap(int i, int j)
{
    int t;

    t = i;
    i = j;
    j = t;
}

void swap_p(int *i, int *j)
{
    int t;

    t = *i;
    *i = *j;
    *j = t;
}

int main(void)
{
    int a, b;

    a = 5;
    b = 10;

    printf("%d %d\n", a, b);
    swap(a, b);
    printf("%d %d\n", a, b);
    swap_p(&a, &b);
    printf("%d %d\n", a, b);

    return 0;
}