zuoye.c

这是Keil C51中的两个例子

#include <reg52.h>
#include <stdio.h>
void main (void)
{
  unsigned char a,b,c;
  unsigned char *p,*q,*s,*t;
  SCON=0x52;
  TMOD=0x20;
  TH1=0XF3;
  TR1=1;
  printf("please input a,b,c:\n");
  scanf("%c %c %c",&a,&b,&c);
  p=&a;
  q=&b;
  s=&c;
  if(*p<*q) {t=p;p=q;q=t;}
  if(*p<*s) {t=p;p=s;s=t;}
  if(*q<*s) {t=q;q=s;s=t;}
  printf("\n%c %c %c",*p,*q,*s);
 }