程序代码：

#include <reg51.h>
sbit key=P3^0;
void delay10ms(unsigned char i)
{
   int n,p;
   for(n=0;n<i;n++)
   for(p=0;p<200;p++);
}
void main()
{
P2=0xa0;P0=0x00;P2=0;
P2=0x80;

while(1)
{
unsigned int i;
if(key==0)
{
for(i=0;i<9;i++)
{
P0=0xFF<<i;
delay10ms(100);
}
for(i=0;i<7;i++)
{P0=0xFF;
P0=0xFF<<(7-i);
delay10ms(100);
}
}
else if(key==1)
{
P0=0x7F;
  delay10ms(100);
  P0=0x3F;
  delay10ms(100);
  P0=0x9F;
  delay10ms(100);
  P0=0xCF;
  delay10ms(100);
  P0=0xEF;
  delay10ms(100);
  P0=0xF3;
  delay10ms(100);
  P0=0xF9;
  delay10ms(100);
  P0=0xFC;
  delay10ms(100);
  P0=0xFE;
  delay10ms(100);
  P0=0xFF;
  delay10ms(100);
  }
  }
  }[local]1[/local]