普中51单片机 蜂鸣器和k3键有bug？

#include <reg52.h>
typedef unsigned int uint;
typedef unsigned char uchar;
uchar code smgduan[17]={0x3f, 0x06,0x5b,0x4f,0x66,0x6d,
0x7d,0x07,0x7f,0x6f,0x77,
0x7c,0x39,0x5e,0x79,0x71,0x00};
void LSMGD(uint a,uint b);
sbit LSA=P2^2; sbit LSB=P2^3;
sbit LSC=P2^4
sbit k3=P3^2;
sbit beep=P1^5;
void delay(uint x);
void LS(uint x); //位选
void LSMGD(uint a,uint b);//第a个数码管显示数字b
{ uint n;
while(1)
{
if(k3==0)
{
delay(10);
if(k3==0)
{
LSMGD(3,3);
}
while(!k3);
for(n=250;n>0;n--)
{
beep=~beep;
delay(2);
}
}
P0=0x00;
}
}
void delay(uint x){
uchar y;
while(x--){
for(y=110;y>0;y--);}
}
void LS(uint x){
if(x==1) {LSA=0;LSB=0;LSC=0; }
if(x==2) {LSA=1;LSB=0;LSC=0; }
if(x==3) {LSA=0;LSB=1;LSC=0; }
if(x==4) {LSA=1;LSB=1;LSC=0; }
if(x==5) {LSA=0;LSB=0;LSC=1; }
if(x==6) {LSA=1;LSB=0;LSC=1; }
if(x==7) {LSA=0;LSB=1;LSC=1; }
if(x==8) {LSA=1;LSB=1;LSC=1; }
}
void LSMGD(uint a,uint b)
{
LS(a); P0=smgduan[b]; delay(10);
}

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