/*************** writer:shopping.w ******************/
#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit Signal = P1^0;
sbit BEEP = P3^7;
void Delay(uint x)
{
uchar i;
while(x--)
{
for(i=0;i<120;i++);
}
}
void main()
{
while(1)
{
if(Signal)
{
BEEP=~BEEP;
Delay(3);
}
}
}
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