练习时，查询到CSDN有为博主提供了IP的判断算法，如连接http://blog.csdn.net/dzyhenry/article/details/8138322

提交后，未通过验证，几经改进，通过了测试，但只拿到及格分数60.

代码如下：请各位指点一二

int IsValueValid(char IP[]) 

{ 

      char *p = IP;

      if(p[0] <'0' ||p[0] >'9')

             return 0;  

      int Len,Integer, DotCnt;

      Len=Integer=DotCnt=0; 

      char LastChar;

   while(*p !='\0') 

   { 

       if((*p)>='0' &&(*p) <='9')  

             {

                    Integer= Integer*10 + *p - '0';

                    Len++;

                    if(Len >3)

                           return 0;

             } 

             else if(*p !='.' ||Integer > 255 ||((*p == '.')&& LastChar == '.' ))

                    return 0;

             else

             {

                            DotCnt++;

                           Integer= 0; 

                           Len= 0;              

             }

             LastChar= *p;

       p++; 

   } 

       if(DotCnt ==3) 

       return1;  

   else   

      return0; 

} 

int main() 

{ 

      char IpAddress[18]; 

      cout << "Please input the ip address: \n";

      cin >> IpAddress; 

      if(IsValueValid(IpAddress)) 

             cout<<"YES";     

      else 

              cout << "NO";

  return0; 

}