I am writing a program in C++ that needs to create and open files based on user input, right now the file is created by the use typing in the filename and the extension like: filename.ext.
What I need to know is, is there a way to automatically add a file extension to user input, and if there is, how.

-Thanks

Assuming you are taking the user input as a string, simply apend the extension t the string the user has entered.

http://www.cppreference.com/cppstring/append.html

That's just what I needed, Thanks!

Wait, Now it will not let me use a string for ofstream, is there a way I can convert the string back to a char?

This post has been edited by aj32: 31 Aug, 2007 - 01:50 PM

Yup...feed it to the function using the c_str() method.

http://www.cppreference.com/cppstring/c_str.html

Yes, that works thanks!

Hey! I just found another way to append something to user input, it is the strcat() function:

I've think this one works best!

...Well, it C instead of C++, but it still works!

Very true, although it's not a great idea to mix the two languages.

Yes, it's not a good idea. But if you do, you have to take care of lot of things like:

##The C++ compiler must be used to compile main(). This allows the C++ compiler to deal with static initialization and other magical things that main() has to do.

##The C++ compiler must be used to direct the linking process. This allows the C++ compilers to deal with templates and also to link in the C++ libraries.

##The C++ and C compilers probably need to come from the same vendor and have compatible versions. This allows them to use compatible calling conventions in the binary code they generate, as well as compatible naming strategies.

##The interface between the two languages should be kept reasonably small. For example, it is unwise to enable all C++ routines in the entire application to be callable from C, although the reverse is possible: it is not that hard to make C routines callable by C++.

This post has been edited by Xing: 6 Sep, 2007 - 05:28 AM