MQ4 Functions?

First I would like to know if a "function" in MQ4 is what is called a "subroutine" on regular programming.

Second I would like to know if you can look in the code of so called " standard functions" on metatrader. I was unable to find the folder.

Third, is it possible to alter standard functions, meaning customizing them while keeping the same name.

Thanks!

1. Functions and methods are the commonly used term for most languages these days. Subroutine means the same thing, but I haven't heard that term for years.

2. The source code for technical indicators like RSI and MACD is available in the expertsindicators folder. The source code for common functions like OrderSend() and iCustom() is not, but that should not be a problem once you get used to using them.

3. MQL4 is a very primitive, out of date programming language. That makes it simple to use for simple things that is was designed to do, but you will struggle trying to do fancy things. No, overloading of function names is not possible. MQL5 has object oriented features. It has been a while since I worked with it, but I believe it allows inheritance and object extensions.

Thanks for the input Meister. The little I know about programming is based on assemble language thats why I use some arcane terms.

I did find the source code for standard indicators, etc that come with metatrader, but what I was really after things like "MathSqrt", "iMA" etc. Now you clarified that saying that they are not available.

Thank you very much your help was really appreciated!