Rust Programming Variable Casting

// THIS PROGRAM CASTS DIFFERING DATATYPES IN RUST


fn main() {

    println!("\nBEGIN PROGRAM.\n");
    println!("\nHere are some stored answers.\n");

    // INITIAL DECLARATIONS

    let x1: u8 = 0;
    println!("\nFIRST ANSWER: {x1}");

    let x2: u16 = 256;
    println!("SECOND ANSWER: {x2}");

    let x3: u32 = 65536;
    println!("THIRD ANSWER: {x3}");

    let y1: i8 = -1;
    println!("FOURTH ANSWER: {y1}");

    let y2: i16 = -129;
    println!("FIFTH ANSWER: {y2}");

    let y3: i32 = -66000;
    println!("SIXTH ANSWER: {y3}\n");

    // CASTINGS BEFORE ADDITION
    let z1 = x1 as u32;
    let z2 = x2 as u32;
    let z3 = y1 as i32;
    let z4 = y2 as i32;

    let z_flash = z1 + z2 + x3;
    let z2_flash = z3 + z4 + y3;

    println!("\nThe sum of the first three values is {z_flash}.");
    println!("The sum of the second three values is {z2_flash}.\n");

    let box_1 = z_flash as i32;
    let box_2 = z2_flash as i32;
    let trailer = box_1 + box_2;

    println!("The sum of both groups is: {trailer}.\n");

    println!("\nEND PROGRAM.\n");