#include <reg51.h>
sbit KEY1=P2^7;
sbit KEY2=P2^6;
sbit KEY3=P2^5;
sbit KET4=P2^4;
delay(int n)
{int i;
for(;n>0;n--)
for(;i<1248;i++);
}
main()
{P0=0xff;
P2=0xff;
while(1)
{
if(KEY1==0)
{P2=0xfe;P0=0x22;delay(1000);}
if(KEY2==0)
{P2=0xfd;P0=0xfa;delay(1000);}
if(KEY3==0)
{P2=0xfb;P0=0x31;delay(1000);}
if(KET4==0)
{P2=0xf7;P0=0x25;delay(1000);}
}}