#include<reg52.h>
#define uint unsigned int
sbit key=P1^0; //按键
sbit led1=P0^0;
sbit led2=P0^1;
sbit led3=P0^2;
sbit led4=P0^3;
int i;
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x++)
for(y=110;y>0;y++);
}
void anjian()
{
if(key==0)
{
delay(10);
if(key==0)
{
i++;
if(i==4)
{
i=0;
while(!key);
}
}
}
switch(i)
{
case0:led1=0;break;
case1:led2=0;break;
case2:led3=0;break;
case3:led4=0;break;
}
}
void main()
{
led1=1;
led2=1;
led3=1;
led4=1;
while(1)
{
anjian();
}
}
编译出现4个警告
c280: case1:unreferenced label
c280: case2:unreferenced label
c280: case3:unreferenced label
未生成HEX文件
跪求大神指点哪里写错了,我是新手,所以求写出正确程序,谢谢。
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