#include<reg51.h>
#define uchar unsigned char
#define uint  unsigned int
sbit s1=P2^4;
sbit s6=P2^3
sbit s2=P2^2;
sbit s3=P2^1;
sbit s4=P2^0;
sbit key0=P0^0;
sbit key1=P0^1;
sbit key2=P0^2;
sbit key3=P0^3;
sbit s5=P0^4;
main
 {
   if(key3==1)
    if(s1==0)  
     if(key0==0){goto loop1;}
     else
         ;
     else
        if(extern key0 SwitchFlagshort==0){goto loop2;}
        else
           ;
         if(extern key0 SwitchFlaglong==0){goto loop3;}
         else
            ;
loop:s1=1;
     s3=1;
     delay 1s();
     P2=0xff;
loop2:s1=1;
      s3=1;
      delay 1s();
      P2=0xff;
loop3:s1=0;
      else
         if(s1==0)
          if(extern key0 SwitchFlagshort==0){goto loop4;}
          else
             ;
           if(extern key0 SwitchFlaglong==0){goto loop5;}
           else
              ;
         else
           if(extern key0 SwitchFlagshort==0){goto loop6;}
           else
              ;
           if(extern key0 SwitchFlaglong==0){goto loop7;}
           else
              ;
loop4:s1=1;
loop5:s3=1;
      delay 4s();
      P2=0xff;
loop6: ;
loop7:s1=1;
      delay 3s();
      P2=oxff;
      s3=1;
      delay 4s();
      P2=0xff;
      if(key3==0||s1==1){s4=1;}
      else
         s4=0;
      if(s1==0&extern key2 Reset1Flagshort==0)
       s1=0;
       delay 1s();
       s1=1;
      else
         ;
      if(s1==0&extern key2 Reset1Flaglong==0)
       s6=1;
       delay 3s();
       P2=0xff;
      else
         ;
      if(key3==0&key1==0)
       {
         s2=1;
         delay 1s();
         P2=0xff;
       }
      else
       {
          ;
       }
 }
       compiling 456.c...
456.C(6): error C141: syntax error near 'sbit', expected ';'
456.C(15): error C129: missing ';' before '{'
456.c - 2 Error(s), 0 Warning(s).

求高人指点，感激不尽

缺分号，缺圆括号，自己找

多谢啊

错误信息把行号都标着呢……

我把main后加了（），为何还不行

请循着错误信息仔细查找……

纯属不用心

你这是51单片机的头文件名，应该在keil中运行，c++运行会出现错误的。

我在main后加个（），出现下列错误：
456.C(76): error C141: syntax error near 'else'
456.C(81): error C202: 'delay': undefined identifier
456.C(81): error C141: syntax error near '1'
456.C(81): error C141: syntax error near 's'
456.C(88): error C233: 'loop1': undefined label
456.c - 37 Error(s), 0 Warning(s).
可是main不加（）出现这样的错误：
compiling 456.c...
456.C(15): error C129: missing ';' before '{'
456.c - 1 Error(s), 0 Warning(s).

我检查了好多次，还是不知哪错了，请高人指点