给定两个整形变量的值，将两个值的内容进行交换

#include <stdio.h>

int main ()
{
	int a = 10;
	int b = 20;
	int tmp = 0;
	printf ("a = %d,b = %d\n",a,b);
	tmp = a;
	a = b;
	b = tmp;
	printf ("a = %d,b = %d\n",a,b);
	return 0;
}

程序运行结果如下：