1 #include 
      
         2 #include 
       
          3 #include 
        
           4 #include 
         
            5 #define MAXN 1024+10  6 char url [MAXN] = "http://www.google.com:80/wiki/Search?search=train&go=Go#steammachine";   7   8 int main()  9 { 10     const char *parseptr1; 11     const char *parseptr2; 12     int len; 13     int i; 14     parseptr2 = url; 15     parseptr1 = strchr(parseptr2, ':'); 16     if ( NULL == parseptr1 ) { 17         printf("URL错误!\n"); 18         return 0; 19     } 20     len = parseptr1 - parseptr2; 21     for ( i = 0; i < len; i++ ) { 22         if ( !isalpha(parseptr2[i]) ) { 23             printf("URL错误!\n"); 24             return 0; 25         } 26     } 27     printf("protocol: "); 28     for(i=0;i