#include<reg51.h>
#define uchar unsigned char
#define uint  unsigned int
sbit l1=P2^4;
sbit l2=P2^1;
sbit s1=P0^3;
main()
{
 if(l1==0)
  {
      if(s1==0)
        {
         delay 1ms(20);
        if(s1==0){goto loop1;}
        }
    else
      ;
    }
  else
     ;
loop1:l1=1;
       ;
      l2=1;
      delay1s(50);
      P2=0xfd;
}
这个程序有如下错误：
compiling 234.c...
234.C(13): error C202: 'delay': undefined identifier
234.C(13): error C141: syntax error near '1'
234.C(13): error C141: syntax error near 'ms'
234.c - 3 Error(s), 0 Warning(s).
这个如何修改，请大侠赐教

这个程序要实现的功能是：l1断开，此时按下开关s1，执行：l1一直通，l2通1s后，然后断开。
请帮忙看看，给出你们宝贵的建议

听话，别学了，出去玩玩

给指点一下呗

只指点想学习的人

我就想学习啊，也正在学习，麻烦指点

delay(50);

dalay函数用的不对。。。。这个是单片机入门程序吧。。。当年我也玩过。。。

#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 s5=P0^4;
sbit key0=P0^0;
sbit key1=P0^1;
sbit key2=P0^2;
sbit key3=P0^3;
void KEY_Init(void);
delay1s(uint x)
{uchar n;
 while(x--)
   {for(n=0;n<125;n++);}
}
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;
     delay1s();
     P2=0xff;
loop2:s1=1;
      s3=1;
      delay1s();
      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;
      delay4s();
      P2=0xff;
loop6: ;
loop7:s1=1;
      delay3s();
      P2=oxff;
      s3=1;
      delay4s();
      P2=0xff;
      if(key3==0||s1==1){s4=1;}
      else
         s4=0;
      if(s1==0&extern key2 Reset1Flagshort==0)
       s1=0;
       delay1s();
       s1=1;
      else
         ;
      if(s1==0&&extern key2 Reset1Flaglong==0)
       s6=1;
       delay3s();
       P2=0xff;
      else
         ;
      if(key3==0&key1==0)
       {
         s2=1;
         delay1s();
         P2=0xff;
       }
      else
       {
          ;
       }
}

compiling 456.c...
456.C(28): error C141: syntax error near 'extern'
456.C(31): error C141: syntax error near 'extern'
456.c - 2 Error(s), 0 Warning(s).
这个错误如何修改啊

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