How i see the question this is actually a compiler question.
Look at it this way, you write a piece of code in Assembly(you can do it in any language) which translates your newly written language you want to call Z++ into Assembly, for simplicity lets call it a compiler (it is a compiler).
Now you give this compiler some basic functions, so that you can write int, string, arrays etc. actually you give it enough abilities so that you can write the compiler itself in Z++. and now you have a compiler for Z++ written in Z++, pretty neat right.
Whats even cooler is that now you can add abilities to that compiler using the abilities it already has, thus expanding the Z++ language with new features by using the previous features
An example, if you write enough code to draw a pixel in any color, then you can expand it using the Z++ to draw anything you want.
