Rust语言中的常量，变量，运算符，数据类型

简单练练，

夏天太热。

const MAX_POINTS: u32 = 100_100;

fn main() {
    let mut x = 5;
    let y = 5;
    let y = y + 1;
    let y = y * 2;
    let guess: u32 = "42".parse().expect("Not a number");
    println!("The value of x is: {}", x);
    x = 6;
    println!("The value of x is: {}", x);
    println!("The value of y is: {}", y);
    println!("The value of guess is: {}", guess);
    println!("The value of MAX_POINTS is: {}", MAX_POINTS);

    let _sum = 5 + 10;
    let _difference = 95.5 - 5.4;
    let _product = 4 * 20;
    let _quotient = 56.7 / 43.2;
    let _remainer = 43 % 4;
    let _t = true;
    let _f: bool = false;
    let _c = 'c';
    let _z = 'Z';

    let tup = (500, 6.4, 10);
    let (_x, y, _z) = tup;
    println!("The value of y is: {}", y);
    println!("The value of tup is: {}", tup.2);

    let a = [1, 2, 3, 4, 5];
    let _first = a[0];
    println!("The value of _first is: {}", _first);

}