1467下载地址 https://docs.qq.com/doc/DWEpnR2pOWU91b3p4?pub=1&dver=2.1.0

#include <reg52.h>

sbit guang = P0 ^ 2;
sbit shen = P2 ^ 0;

void delay( unsigned char a )
{
	while ( --a )
		;
}


void main()
{
	unsigned char	i	= 0;
	unsigned char	j	= 0;
	unsigned char	k	= 0;

	while ( 1 )
	{
		//没有光的情况下
		if ( guang == 0)
		{
			//判断有无声音