#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
sbit dula=P2^6;
sbit wela=P2^7;
void delay(uint x)
{
uchar i;
while(x--)
for(i=0;i<110;i++);
}
void main()
{
while(1)
{dula=1;
P0=table[1];
dula=0;wela=1;
P0=0xfe;
wela=0;
//P0=0xff;

P0=0xff;

delay(10);

wela=1;
P0=0xfd;
wela=0;
//P0=0xff;
 dula=1;
P0=table[2];
dula=0;
P0=0xff;

delay(10);
 wela=1;
P0=0xfb;
wela=0;
 dula=1;
P0=table[3];
dula=0;
//P0=0xff;

P0=0xff;

delay(10);
}

}

為什么這樣寫，第三個數碼管不能亮