text file name

[Lucas Fiorini]

I need to enter only the name of a user and automatically put ".txt" in the end of the name to create a text archive without the need of the user to write the ".txt" in the end;
something like that:

string name;
cin >> name;
ofstream user(name.c_str());//but add the .txt in the end

[jlb]

What have you tried? You're using a std::string so you can just "add" the desired extension to the end of the string.

By the way if you are compiling for one of the current C++ standards (C++11, C++14) you shouldn't need to use c_str() any longer for the stream constructors.

[CosminPerRam]

Try this: name += ".txt"; :) after cin >> name;

[Chervil]

There are lots of ways to do this.
The most direct would be

ofstream user( (name + ".txt").c_str() );

or if that seems hard to read,
you might do

string filename = name + ".txt";
ofstream user(filename.c_str());

Also a modern C++ compiler (in C++11 mode or later) should accept a std::string without the .c_str()

ofstream user(filename);

[Lucas Fiorini]

Thanks everyone! It worked!