For computer games, you'd need to know many different language to make a very nice and good looking game, but I'd prefer you give C++ a shot. If you have no knowledge prior to programming, I'd suggest to not start with C++ as it will be hard for you to get into it.

As for application for iPhone, you'd need to know Obj-C or Apple's new programming language "Swift" which has just been released. For Android you can use Java, C++, Python etc.

If you have no knowledge of coding right now, I'd suggest starting with Batch. It's basic but easy to learn and it shows you some of the basics. After that you could move up to Java/C++.

Wand wrote If you have no knowledge of coding right now, I'd suggest starting with Batch. It's basic but easy to learn and it shows you some of the basics. After that you could move up to Java/C++.

Python is a great language to learn as well, it's basically like the English language.

Try a few languages and learn the language that you feel most comfortable with. I personally like java since it's easy but there are loads of languages to choose from like C++ or Python.

Python is a good one but if you want to try something else, then try java

Everyone here clearly doesn't program. Python is terrible. I actually don't consider it to be a programming language.
People keep saying jump straight into C++, don't.
A lot of computer games are C# w/ Unity (uses OpenGL or Unity, idk) or C++ w/ plain OpenGL or sometimes python with blender but doesn't look that nice tbh.
For apps, it's Obj-c or Java depending on platform. Anyone who says C++ for android etc. although possible, is retarded.