Writing first Rust program

Before writing a program in rust, lets look up some necessosary keywords, recommendations and steps :

• rustup : A tool to manage rust and its tools.
• rustc : A rust compiler that converts rust source code into executable.
• rustfmt : A rust tool to make your source code pretty and clear. (fmt ⟶ Format)
• rust-analyzer : A tool for some IDEs to make developer experience better.
• Always create source code file with .rs extention and snake_case naming style.
• Create a function main in source code file

Program execution

To execute a program you have to :

• Create a file with .rs extention. (ex: hello_world.rs)
• Make a main function within that file then save that file.(mendatory)
• Use rustc compiler to create a executable file of source file. rustc hello_world.rs It will create a executable file with same name.
• Run the executable file.

Project Setup

It is necessosary to write code in a structured format instead of writing code in different directories or throwing files on desktop.

• Create a directory which you uses for practicals along with your rust code journey. (ex: mkdir rust_practicals)
• Make meaningfull source file name with recommended snake_case
• You can create more child directories for more ease when you make the journey longer.
• If you are using IDE, then make sure to install rust-analyzer for more ease.

Writing Hello World!! program

Lets write our first hello world program in rust using following steps :

• Step 1 - Create a directory for our all rust source code and practicals and open it in any IDE/editor. (mac/linux : mkdir rust_practicals && cd rust_practicals)
• Step 2 - Create a new file with .rs extention. ex : hello_world.rs
• Step 3 - Create a main function that prints "Hello World!!" to output.
  
  hello_world.rs rust

  fn main() {
      println!("Hello World!!");
  }

• Step 4 - Use rustc to make executable file using above source code file.
  rustc hello_world.rs
• Step 5 - Run the executable. (mac/linux: ./hello_world, Powershell: .\hello_world.exe)
• Now you can see the output Hello World!! on your screen.

Remember the flow : source_code ⟶ compiler ⟶ executable ⟶ run ⟶ output