/*任务4：K1，K2全按下，P1全亮，松开K2,LED不灭，松开K1，LED全灭*/
#include"reg52.h"
sbit K1=P0^0;
sbit K2=P0^1;
void delay(unsigned int c)
{
while(c--);
}
void main()
{
K1=1;
K2=1;
P1=0X00;
while(1)
{
if(K1==0)
{
delay(500);
if(K1==0)
{
if(K2==0)
{
delay(500);
if(K2==0)
{
P1=0XFF;
}
}
}
else
{
P1=0X00;
}
}
}
}
