#include <stdio.h>

void swap(int *i, int *j)
{
int t;
t = *i;
*i = *j;
*j = t;
}

void main()
{
int a,b;
a=5;
b=10;
printf("%d %d\n",a,b);
swap(&a,&b);
printf("%d %d\n",a,b);
}