请问这个程序为什么晶体管上数字不变
#include<reg52.h>
#define uchar unsigned char
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uchar num,a,b,c,d;
sbit dula=P2^6;
sbit wela=P2^7;
void delay(uchar);
void main()
{
num=0;
wela=1;
P0=0xfe;
wela=0;
while(1)
{
d=0;
d++;
if(d==2)
{
d=0;
num++;
}
dula=1;
P0=table[num];
dula=0;
if(num==16)
num=0;
delay(100);
}
}
void delay(uchar c)
{
uchar a,b;
for(a=1;a<c;a++)
for(b=1;b<200;b++);
}
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