Надо сделать изменения с++

void changeLogin()
{
cin.ignore();
ofstream fof("bd.txt");
string nume;
cout<<"Введите Логин пользователя, имя которого вы хотите изменить"<<endl;
cout<<"Логин: ";
getline(cin,nume);
for(int i=0;i<n-1;i++){
if(arr[i].login == nume){
string newbal;
fof<<arr[i].position<<endl;
cout<<"Введите новое имя пользователя с логином: "<<nume<<endl;
cout<<"> ";
getline(cin,newbal);
fof<<newbal<<endl;
fof<<arr[i].surname<<endl;
fof<<arr[i].login<<endl;
fof<<arr[i].sex<<endl;
fof<<arr[i].rego[i].year<<" "<<arr[i].rego[i].month<<" "<<arr[i].rego[i].day<<endl;
fof<<arr[i].birth[i].year<<" "<<arr[i].birth[i].month<<" "<<arr[i].birth[i].day<<endl;
fof<<arr[i].balance<<endl;
fof<<arr[i].mbalance<<endl;
i++;
}
fof<<arr[i].position<<endl;
fof<<arr[i].name<<endl;
fof<<arr[i].surname<<endl;
fof<<arr[i].login<<endl;
fof<<arr[i].sex<<endl;
fof<<arr[i].rego[i].year<<" "<<arr[i].rego[i].month<<" "<<arr[i].rego[i].day<<endl;
fof<<arr[i].birth[i].year<<" "<<arr[i].birth[i].month<<" "<<arr[i].birth[i].day<<endl;
fof<<arr[i].balance<<endl;
fof<<arr[i].mbalance<<endl;
}
fof<<arr[n-1].position<<endl;
fof<<arr[n-1].name<<endl;
fof<<arr[n-1].surname<<endl;
fof<<arr[n-1].login<<endl;
fof<<arr[n-1].sex<<endl;
fof<<arr[n-1].rego[n-1].year<<" "<<arr[n-1].rego[n-1].month<<" "<<arr[n-1].rego[n-1].day<<endl;
fof<<arr[n-1].birth[n-1].year<<" "<<arr[n-1].birth[n-1].month<<" "<<arr[n-1].birth[n-1].day<<endl;
fof<<arr[n-1].balance<<endl;
fof<<arr[n-1].mbalance;
fof.close();

Код

 

void changeLogin()

{

    cin.ignore();

    ofstream fof("bd.txt");

    string nume;

    cout<<"Введите Логин пользователя, имя которого вы хотите изменить"<<endl;

    cout<<"Логин: ";

    getline(cin,nume);

    for(int i=0;i<n-1;i++){

        if(arr[i].login == nume){

                string newbal;

                fof<<arr[i].position<<endl;

                cout<<"Введите новое имя пользователя с логином: "<<nume<<endl;

                cout<<"> ";

                getline(cin,newbal);

                fof<<newbal<<endl;

                fof<<arr[i].surname<<endl;

                fof<<arr[i].login<<endl;

                fof<<arr[i].sex<<endl;

                fof<<arr[i].rego[i].year<<" "<<arr[i].rego[i].month<<" "<<arr[i].rego[i].day<<endl;

                fof<<arr[i].birth[i].year<<" "<<arr[i].birth[i].month<<" "<<arr[i].birth[i].day<<endl;

                fof<<arr[i].balance<<endl;

                fof<<arr[i].mbalance<<endl;

                i++;

        }

       fof<<arr[i].position<<endl;

       fof<<arr[i].name<<endl;

       fof<<arr[i].surname<<endl;

       fof<<arr[i].login<<endl;

       fof<<arr[i].sex<<endl;

       fof<<arr[i].rego[i].year<<" "<<arr[i].rego[i].month<<" "<<arr[i].rego[i].day<<endl;

       fof<<arr[i].birth[i].year<<" "<<arr[i].birth[i].month<<" "<<arr[i].birth[i].day<<endl;

       fof<<arr[i].balance<<endl;

       fof<<arr[i].mbalance<<endl;

    }

     fof<<arr[n-1].position<<endl;

       fof<<arr[n-1].name<<endl;

       fof<<arr[n-1].surname<<endl;

       fof<<arr[n-1].login<<endl;

       fof<<arr[n-1].sex<<endl;

       fof<<arr[n-1].rego[n-1].year<<" "<<arr[n-1].rego[n-1].month<<" "<<arr[n-1].rego[n-1].day<<endl;

       fof<<arr[n-1].birth[n-1].year<<" "<<arr[n-1].birth[n-1].month<<" "<<arr[n-1].birth[n-1].day<<endl;

       fof<<arr[n-1].balance<<endl;

       fof<<arr[n-1].mbalance;

    fof.close();

надо изменить логин и имя отдельно но не для всех как сделать?