Learning Rust - Syntax

Rust is another compiling language that may replace the position of C/C++ in server filed.

It runs fast and can be written easily comparing with Python/Go. Python is a dynamic language

and is limited in GIL, while Go is limited in its GC. That is reason why I prefer to learning Rust.

Without managing memory by yourself, GC limitation and GIL limitation, I like the feeling of

flying and do what I want. Actual it is a kind of feature of a programming language. In reality,

we are going to choose a proper language when developing a poject according to the condition

that can save cost and a better future of extending.

1.Rust macro:

If we add `!` affter a callee function, we call on a macro. And it is normal function when we call

without `!`.

println!("Hello World")