编程题目记录140522：C++的第一份还算丰富的代码

class TestQuery
{
    public:
        void InputFile(ifstream *fptr)
        {
            StoreLines(fptr);
            WordCount();
        }
        void StoreLines(ifstream *fptr);
        void WordCount();
        void Quest(string word);
    private:
        vector<string> lines;
        multimap<string,int> word_cnts;        
};

int main()
{
    ifstream fp("textof10.txt");
    if(fp==NULL)
        cerr<<"open file error!"<<endl;
        
    TestQuery tq;
    tq.InputFile(&fp);
    
    string word;
    cout<<"Please enter the word you want to search,q to quit"<<endl;
    
    while(cin>>word&&word!="q")
        tq.Quest(word); 

    return 0;
}

void TestQuery::StoreLines(ifstream *fptr)
{
    string line;
    while(getline(*fptr,line))
        lines.push_back(line);
}

void TestQuery::WordCount()
{    
    for(vector<string>::size_type i=0;i<=lines.size()-1;++i)
    {
        istringstream line_by_word(lines[i]);
        string word;
        while(line_by_word>>word)
            word_cnts.insert(make_pair(word,i));
    }
}

void TestQuery::Quest(string word)
{
    multimap<string,int>::size_type tol=word_cnts.count(word);
    cout<<word<<" occurs "<<tol<<" times."<<endl;
    multimap<string,int>::iterator itl=word_cnts.lower_bound(word);
    multimap<string,int>::iterator itu=word_cnts.upper_bound(word);
    
    for(;itl!=itu;++itl)
        cout<<"\t(line "<<itl->second+1<<") "<<lines[itl->second]<<endl;    
}