add of project

void addnum:: add(string name)
{
    fstream fin;
    //ofstream out;
    fin.open("phonebook.csv",ios::in | ios::app);
    //out.open("Edited.csv",ios::out);
    vector<string>row;
    string line,word,temp,num;
    cout<<"Enter the Number"<<endl;
    cin>>num;
    fin<<name<<","<<num<<endl;
    fin.close();
}