找不出問題在哪里啊

#include "reg51.h" 
#include"stdio.h"
#define Unsigned char 
sfr p2=0xa0;
sfr p1=0x90;
sfr p0=0x80;
sbit P10=P1^0;                                               
sbit P11=P1^1;    
sbit P12=P1^2;
sbit P13=P1^3;
sbit P14=P1^4;
sbit P15=P1^5;
sbit P16=P1^6;
sbit P17=P1^7;
Unsigned char dis[11]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x67,0x00};                                                 
unsigned char num,num2,num3,num4,num5,num6,num7;
unsigned char nu=0;
main()
{ P1=0xff;P11=1;                            
  while(1)                                        
  {if(!P10)                   
   {num=0;nu++;scan();}                  
   else
   {num2=0;num3=0;num4=0;num5=0;num6=0;num7=0;}    
                                          
  }
}
void disp()                                         
{ num=num2+num +num4+num5+num6+num7; 
if(!p11) nu=1;
p0=dis[num];
p2=dis[nu];
}
scan()
{
   while(!P10)   
   {  if(!P12)
      {  num2=1;while(!P12);}   
      if(!P13)
      {  num3=1;while(!P13);}
      if(!P14)
      {  num4=1;while(!P14);}
      if(!P15)
      {  num5=1;while(!P15);}
      if(!P16)
      {  num6=1;while(!P16);}
      if(!P17)
      {  num7=1;while(!P17);}
   disp();
    }
}