通过字符串文件c ++查找子字符串

Question

初学者（大多数情况下，无论如何）在这里。我正在开发一个程序，它从字典文件中获取单词，将其循环到一个字符串中，然后找到一个特定的子字符串，每个单词可能出现多次。这个节目正在通过＆＃34; Cie＆＃34;和＆＃34; Cei＆＃34;查看每个弹出文件的次数。我大部分时间都在工作，它确实准确地获得了＃34; cei＆＃34;的正确时间。但是，它会向tally添加几个额外的增量，使其显得微不足道。这是代码：

    struct Dictionary
{
    void checker(ifstream&);
    void out();
private:
    int tally, tally2 = 0;
};

void Dictionary::checker(ifstream&usa)
{
    string k;
    while (usa >> k)
    {
        transform(k.begin(), k.end(), k.begin(), ::tolower);
        string::size_type start_pos = 0;
        while(string::npos != (start_pos = k.find(cie, start_pos)))
        {
            tally++;
            ++start_pos;
        }
        string::size_type begin_pos = 0;
        while(string::npos != (begin_pos = k.find(cei, begin_pos)))
        {
            tally2++;
            ++begin_pos;
        }
    }
}



void Dictionary::out()
{
    cout << "The number of words cie is used in is: " << tally << endl;
    cout << "The number of words cei is used in is: " << tally2 << endl;
}


int main()
{
    try{
        //string american("/usr/share/dict/american");
        ifstream american {"./american.rtf"};
        if (!american)
            throw runtime_error("Can't open input file.");
        Dictionary words;
        words.checker(american);
        words.out();
    }
    catch(const runtime_error& e)
    {
        cerr << "Exception: " << e.what() << endl;
    }

    return 0;
}