I agree with peter_budo, in that if you're looking for a javaSCRIPT tile-based game...well that's a whole other story, and quite frankly I wouldn't bother.

A Java tile-based game though is...

C++ for a text-based game?? I think that would be overkill. In today's day and age, the web is a perfect place to deploy a text-based game (and makes it really easy to do multiplayer!)

Why not...

Haha that's awesome. I think it's great when young folks are setting their goals high to do some crazy stuff. The worst that could happen is....nothing...you don't complete anything, but you'll learn...

I would stay away from ActionScript and the like, unless your true goal is to make a bunch of browser games. The Flash market seems to be quite different from all the rest of the games, so that's a...

I would check out BlitzMax. Yes, it's based on BASIC, but don't let that fool you into thinking it's not powerful — it's essentially a cross-platform wrapper around C++. It builds upon OpenGL/DirectX...

This is pretty simple. Just take your string (which depending on how your using strings, will be a char* or an std::string), and iterate through each char until you reach the '\n' new line character.