单片机键盘检测程序不知道哪错了求高手指教，

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit dula=P2^6;
sbit wela=P2^7;
sbit key1=P3^4;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,0};
void display();
void delay(uint);
uchar bb,num,temp;
void main()
{
wela=1;
P0=0xc0;
wela=0;
dula=1;
P0=0;
dula=0;
while(1)
{
P3=0XFE;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xee:num=1; break;
case 0xde:num=2; break;
case 0xbe:num=3;break;
case 0x7e:num=4;break;
}
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0Xf0;
}
} dula=1;
P0=table[num-1];
dula=0 ;
P3=0XFd;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0 ;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xed:num=5; break;
case 0xdd:num=6; break;
case 0xbd:num=7;break;
case 0x7d:num=8;break;
}
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0Xf0;
}
dula=1;
P0=table[num-1] ;
dula=0;
}
P3=0XFb;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xeb:num=9; break;
case 0xdb:num=10; break;
case 0xbb:num=11;break;
case 0x7b:num=12;break;
}
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0Xf0;
}
dula=1;
P0=table[num-1];
dula=0;
}
P3=0XF7;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xe7:num=13; break;
case 0xd7:num=14; break;
case 0xb7:num=15;break;
case 0x7e:num=16;break;
}
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0Xf0;
}
dula=1;
P0=table[num-1];
dula=0;
}
}
}
void delay(uint xms)
{
uint x,y;
for(x=xms;x>0;x--)
for(y=110;y>0;y--);
}