Rust 程式設計視訊教程對應講解內容－變數

頭條地址：https://www.ixigua.com/i676544267458235648...
Ｂ站地址：https://www.bilibili.com/video/av78062009?...
網易雲課堂地址：https://study.163.com/course/introduction....

const MAX_POINTS1: u32 = 100000; //const
fn main() {
    const MAX_POINTS: u32 = 100000; //const
    println!("MAX_POINTS = {}", MAX_POINTS); //
    println!("MAX_POINTS = {}", MAX_POINTS1); //
    //let a: u32 = 10; //inmut
    let mut a: u32 = 10;//mutable
    println!("a = {}", a);
    let b: String = String::from("Hello!");
    println!("b = {}", b);
    a = 20;
    println!("update a = {}", a);
    let b = 30; //hide
    println!("update b = {}", b);
    let a = String::from("this is a"); //hide
    println!("update second a = {}", a);
    println!("Hello, world!");
}

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