[variables] added some content to main & explanations

# This file is automatically @generated by Cargo.

# It is not intended for manual editing.

version = 4

[[package]]

name = "variables"

version = "0.1.0"

[package]

name = "variables"

version = "0.1.0"

edition = "2024"

[dependencies]

fn main() {

//    let mut x = 5;

//    println!("The value of x is {x}");

//    x = 6;

//    println!("The value of x is {x}");

    let x1 = 5;

    let x1 = x1 + 1;

    {

        let x1 = x1 * 2;

        println!("The value of x1 in the inner scope is: {x1}");

    }

    println!("The value of x1 is: {x1}");

    let mut x: u32 = 1;

    {

        let mut x = x;

        x += 2;

    }

    println!("{x}"); // this outputs 1 because the shadowed value == 3 stays in scope of the brackets

    // let mut y: u32 = 1;

    // y = "Hello world"; // doesn't compile: you're trying to shadow a mut variable with a different data type, which is not allowed!

    // println!("{y}");

}