1. create a HelloWorld-App folder and navigate to that folder using the console
2. reate a Rust file by executing

   notepad Hello.rs

3. program defines a function main fn main()
   fn keyword is used to define a function
   main() is a predefined function that acts as an entry point to the program
   println! is a predefined macro in Rust
   used to print a string (here Hello) to the console
   macro calls are always marked with an exclamation mark !

   fn
   main(){
      println!("Rust says Hello to TutorialsPoint !!");
   }

4. compile the Hello.rs file using rustc

   rustc Hello.rs

5. use dir command to check results
   from the console run Hello.exe

• Using the println! Macro - Syntax
• Comments in Rust

Rust provides a powerful macro system that allows meta-programming
macros look like functions except that their name ends with a bang(!)
instead of generating a function call, macros are expanded into source code that gets compiled with the rest of the program
macros provide more runtime features to a program unlike functions
macros are an extended version of functions

println!(); // prints just a newline
println!("hello "); //prints hello
println!("format {} arguments", "some"); //prints 'format some arguments'

• Single-line comments ( // ) − any text between a // and the end of a line is treated as a comment
• Multi-line comments (/* */) − these comments may span multiple lines