How hard is it to code a game in C++?

I'm just wanting a rough estimation here, but I, like most of the 4chan community, have ideas for games, or movies, or what have you.

So I'm learning C++, and I'm doing pretty good with everything I've learned so far.  I'm only taking a beginning course in my college, but I'm still doing good in it.

So, if I wanted to create a platform game, or a fighting game, or even a tile game (Pokemon Clone), how hard is it?

If I already had all the graphics, all the story written out, and all the gameplay mechanics worked out, how long, and how hard would it be to create a game from scratch, using just C++?

>>1 if you are really serius, i would recommend SDL (http://www.libsdl.org)
I also strongly advice you to create a very basic game before you continue with you grand plans, maybe like a minigame in your larger game plans.