[IMG]http://fm171.img.xiaonei.com/pic001/20071022/22/43/head_18374g169.jpg[/IMG]

图片太小了
#include <stdio.h>
static int a,b;
int main()
{
void swap(int x,int y);
//static int a,b;
a = 5;
b = 9;
if(a < b)swap(a,b);
printf("'a' is %d\n'b' is %d\n",a,b);
getchar();
//system("pause");
}
void swap(int x,int y)/*交换函数*/
{
int temp;
temp = x;
x = y;
y = temp;
a=x;
b=y;

}
/*swap()的值不能传出来*/



现在可以了