#include <reg52.h>

#define uchar unsigned char 

sbit dula=P2^6;
sbit wela=P2^7;

sbit jia_key=P3^6;
sbit jian_key=P3^7;
sbit zf_key=P3^5;
bit flag=0;
uchar num=0,show_num=2,maichong=4,table_begin=0;

uchar code table1[]={0x01,0x02,0x04,0x08,0x08,0x04,0x02,0x01};

//uchar code table1[]={0x09,0x03,0x06,0x0c,0x08,0x04,0x02,0x01};

//uchar code table1[]={0x01,0x04,0x02,0x08,0x08,0x02,0x04,0x01};

uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
                        0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void delay(uchar i)
{
  uchar j,k;
  for(j=i;j>0;j--)
    for(k=125;k>0;k--);
}
void display()
{
   dula=0;
   P0=table[show_num];
   dula=1;
   dula=0;
   
   wela=0;
   P0=0xfe;
   wela=1;
   wela=0;
   delay(5);
   
   P0=table[0];
   dula=1;
   dula=0;
   
   P0=0xfd;
   wela=1;
   wela=0;
   delay(5);

  
}
void key ()
{
   if(jia_key==0)
   {
     delay(5);
	 if(jia_key==0)
	 {
	   num++;
	   if(num==4)
	     num=3;	
	 	 while(jia_key==0);
	 }
   }

   if(jian_key==0)
   {
     delay(5);
	 if(jian_key==0)
	 {
        if(num!=0)	  
         num--;
		 else 
		 num=0;
		 while(jian_key==0);
	 }
   }

   if(zf_key==0)
   {
     delay(5);
     if(zf_key==0)
	 {
	   flag=~flag;
	   while(zf_key==0);
	 }
   }
}

void dispose()
{
  switch(num)
  {
    case 0:
     show_num=2;
     maichong=5;
	 break;
	case 1:
	 show_num=4;
     maichong=4;
	break;
	case 2:
	 show_num=6;
     maichong=3;
	break;
	case 3:
	 show_num=8;
     maichong=2;
	break;
  }
  if(flag==0)
  {
    table_begin=0;
  }
  else 
    table_begin=4;
}


void qudong()
{
  uchar i,j;
  for(j=0+table_begin;j<4+table_begin;j++)  
 {
    P1=table1[j];
    for(i=0;i<maichong;i++)
	{
	  display();
	}
  }
}

void main()
  {
     while(1)
       {
         
		 key();
		 dispose();
		 qudong();
         }

    }