#include<stdio.h>
void Swap(int* pa,int* pb)
{
	int tmp = 0;
	 tmp = *pa;
	*pa = *pb;
	*pb = tmp;
}
int main()
{
	int a = 10;
	int b = 20;
	printf("%d %d\n", a, b);
	Swap(&a, &b);
		printf("%d %d", a, b);
	return 0;

}