求高手看看这程序有什么问题，51单片机温度传感器数码管显示，

Question

#include<reg52.h> //包含头文件，一般情况不需要改动，头文件包含特殊功能寄存器的定义
#define uchar unsigned char
#define uint unsigned int
#define dataport P2

sbit duan=P1^1;//定义锁存使能端口 段锁存
sbit wei=P1^2;// 位锁存
sbit DQ=P3^0;
uchar temp;
unsigned char code DuanM[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};// 显示段码值0~F
unsigned char code WeiM[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};//分别对应相应的数码管点亮,即位码

void delay(unsigned int t);
void Delay_50us(uint t);
void write_byte(uchar dat);
uchar read_byte(void);
uchar readtemperature(void);
void init_ds18b20(void);
void display(void);

main()
{
while(1)
{
temp=readtemperature();
display();
}
}

void init_dis18b20(void)
{
uchar n;
DQ=1;
delay(8);
DQ=0;
delay(80);
DQ=1;
delay(8);
n=DQ;
delay(4);

}

void write_byte(uchar dat)
{
uchar i;
for(i=0;i<8;i++)
{
DQ=0;
DQ=dat&0x01;
delay(4);
DQ=1;
dat>>=1;
}
delay(4);
}

uchar read_byte(void)
{
uchar i,value;
for(i=0;i<8;i++)
{
DQ=0;
value>>=1;
DQ=1;
if(DQ)
value|=0x80;
delay(4);

}
return value;
}

uchar readtemperature(void)

{
uchar a,b;
init_ds18b20();
write_byte(0xcc);
write_byte(0x44);
delay(300);

init_ds18b20();
write_byte(0xcc);
write_byte(0xbe);
a=read_byte();
b=read_byte();
b<<=4;
b+=(a&0xf0)>>4;
return b;

}

void display(void)
{
dataport=1;
duan=1;
duan=0;

dataport=WeiM[1];
wei=1;
wei=0;
dataport=0xff;

dataport=DuanM[temp%10];

duan=1;
duan=0;

Delay_50us(20);

wei=1;
dataport=WeiM[2];
wei=0;
dataport=0xff;

duan=1;
P2=DuanM[temp/10];
duan=0;
Delay_50us(20);

}

void delay(uint k)
{
while(k--);
}

void Delay_50us(uint t)
{
uchar j;
for( ;t>0;t--)
for(j=19;j>0;j--);
}

Answer 1

运行之后有什么现象？不然这么一大堆程序，到哪儿去找啊？