C++ string和map容器实现简单的英文翻译

int main(int argc, const char *argv[]){    ifstream ifl;    ifl.close();    ifl.clear();    string mapfilename("map.txt");    string transformname("transform.txt");    ifl.open(mapfilename.c_str());        string key,value;    map<string,string> maptransform;    while(ifl>>key>>value)    {        maptransform.insert(make_pair(key,value));         }    ifl.close();     ifl.clear();        ostream::fmtflags oldflags=cout.flags();         map<string,string>::iterator iter=maptransform.begin();        cout<<"---------------------------------------"<<endl;    cout<<"the map.txt is: "<<endl;    while(iter!=maptransform.end())    {        string tmp;        cout<<setw(16)<<left;        (tmp="key: ")+=iter->first;        cout<<tmp;        cout<<setw(16)<<left;        (tmp="value: ")+=iter->second;        cout<<tmp<<endl;        ++iter;    }        cout.flags(oldflags);        cout<<"---------------------------------------"<<endl;    ifl.open(transformname.c_str());    string tmp,text;    cout<<"the transformname.txt is: "<<endl;    while(getline(ifl,tmp))    {        cout<<tmp<<endl;        text+=tmp+='\n';    }        {        string subtext(text);        cout<<"transform transform.txt`s text by string::find "            <<"and string::replace : "<<endl;         for(iter=maptransform.begin();iter!=maptransform.end();++iter)        {            string::size_type pos=subtext.find(iter->first);            if(pos!=string::npos)                subtext.replace(pos,iter->first.size(),iter->second);        }        cout<<subtext;    }         {        cout<<"---------------------------------------"<<endl;        cout<<"transform transform.txt`s text "            <<"by instead ostream : "<<endl;         istringstream istm(text);        string word;        bool firstword=true;        while(istm>>word)        {            map<string,string>::const_iterator iter=                maptransform.find(word);            if(iter!=maptransform.end())                word=iter->second;            cout<<(firstword?(firstword=false,""):" ")<<word;        }        cout<<endl;    }    ifl.close();    ifl.clear();    system("pause");    return 0;}