输出句子中的最长单词和最短单词

 

void selectsentence()
{
    string line1("We were her pride of 10 she named us:");
    string line2("Benjamin,Phoenix,the Prodigal");
    string line3("and perspicacious pacific Suzanne");
    string sentence=line1+" "+line2+" "+line3;
    string seperate(" \n\v\r\a\? : ,\t\b\f");
    vector<string>longword,shortword;
    string word,Lword,Sword;
    int count=0;
    string::size_type startpos=0,endpos=0,slen;
    while((startpos=sentence.find_first_not_of(seperate,endpos))!=string::npos)
    {
       ++count;
       endpos=sentence.find_first_of(seperate,startpos);
      // word=sentence.substr(startpos,endpos);
       cout<<endpos<<endl;
       if(endpos==string::npos)
       {
           slen=sentence.size()-startpos;
       }
       else
       {
           slen=endpos-startpos;

       }
       word.assign(sentence.begin()+startpos,sentence.begin()+startpos+slen);
      // startpos=sentence.find_first_not_of(seperate,endpos);
       cout<<word<<endl;
       if(count==1)
       {
           Lword=Sword=word;
           longword.push_back(Lword);
           shortword.push_back(Sword);
       }
       else
       {   if(word.size()>Lword.size())
            {
                longword.clear();
                   Lword=word;
                   longword.push_back(Lword);

            }
          else   if(word.size()==Lword.size())
               {
                   Lword=word;
                   longword.push_back(Lword);

               }
         else   if(word.size()<Sword.size())
               {
                   shortword.clear();
                   Sword=word;
                   shortword.push_back(Sword);

               }
         else if(word.size()==Sword.size())
               {
                   Sword=word;
                   shortword.push_back(Sword);
               }

       }



    }
    cout<<"单词的个数为"<<count<<endl;
    vector<string>::iterator longw=longword.begin(),shortw=shortword.begin();
    cout<<"最长的单词为";
    while(longw!=longword.end())
        cout<<*longw++<<endl;
    cout<<"最短的单词为";
    while(shortw!=shortword.end())
        cout<<*shortw++<<endl;


}

endpos的值在到最后的时候返回的是失败的值，所以必须考虑进去,,,
 

里边有一点需要主要的 
   if(endpos==string::npos)
   {
   slen=sentence.size()-startpos;
   }
   else
   {
   slen=endpos-startpos;

   }