Every compilers doesn't need internet connection while coding ah?

Answer 1

No, there is no need for an internet connection. What a compiler does is that it translate a programming language into another computer language, which often have a binary form know as object code.

The compiler is based on your computer locally and should be thought of as a computer program, that knows how to translate C# (for instance) into object code.

Answer 2

no you don't need internet for compiling