int a1,a2;

/*数据内容交换*/
        swapchangedata(p11,p12)
        int *p11,*p12;
        {
                int p;
                p=*p11;
                *p11=*p12;
                *p12=p;
        }
/*数据指针地址交换*/
        swapchangepoint(p21,p22)
        int *p21,*p22;
        {
        int *pp;
        pp=&*p21;
        p21=&*p22;
        p22=pp;
 a1=*p21;
 a2=*p22;
 return;
        }
main()
{
 int *p1,*p2,a,b;
 scanf("%d,%d",&a,&b);
 p1=&a;
 p2=&b;
/* 数据交换 */
 if(*p1<*p2)
 {
         printf("max:%d min:%d\n",*p2,*p1);
 } else {
         printf("max:%d min:%d\n",*p1,*p2);
 }

/*指针地址交换*/
        if(*p1<*p2)
        {
                p1=&b;
                p2=&a;
        }
        printf("max:%d min:%d\n",*p1,*p2);

        swapchangedata(p1,p2);
        printf("swapchangedata:%d,%d\n",a,b);

        swapchangepoint(p1,p2);
        printf("swapchangepoint:%d,%d\n",a1,a2);

}