Rust Basics

basics.rs

const MAX_ITEM1: i64 = 1000000;
const MAX_ITEM2: &str = "HJ";

fn main() {
    let y = 3;
    println!("y = {}", y);

    let mut x = 1;
    x += 1;
    println!("x = {}", x);

    println!("MAX_ITEM1 = {}", MAX_ITEM1);
    println!("MAX_ITEM2 = {}", MAX_ITEM2);

    let msg = "Hello World";
    println!("{}", msg);

    // Shadowing
    let h = 2;
    println!("h before = {}", h);

    let h = "h";
    println!("h after = {}", h);

    /*
      Data Types
      ----------
      Signed Integers --> i8, i16, i32, i64, i128, isize
      Unsigned Integers --> u8, u16, u32, u64, u128, usize

      floats
      boolean
    */
    let a: i32 = 2;
    let b = 24i64;
    println!("a = {}", a);
    println!("b = {}", b);

    let c: bool = true;
    let d = if c { "c is true" } else { "c is false" };
    println!("d = {}", d);

    let mut e = 1;

    let f = loop {
        e += 1;
        if e == 10 {
            break "e is 10";
        }
    };

    println!("e = {}", e);
    println!("f = {}", f);
    println!("test1(1., 2.24) = {}", test1(1., 2.24));
}

fn test1(a: f64, b: f64) -> f64 {
    a + b
}

Playground -> https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=6f231d50947f1ec4f2553d483b879bce