happy.c

这是用51单片机开发的流水灯程序

#include<reg52.h>
#include<intrins.h>
#define unit unsigned int
#define uchar unsigned char
uchar num;
void delay(unit);
void main()
{
    num=0xef;
       while(1)
  {
   
    
    if(num==0x7f)
    {
      P2=num;
      delay(300);
      num=_cror_(num,1);
    }
    if(num=0xef)
    {
     num=0xef;
     P2=num;
     delay(300);
    num=_crol_(num,1);

    }
  }
}
  void delay(unit z)
{
  unit x,y;
   for(x=z;x>0;x--)
     for(y=110;y>0;y--);
}