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For while loop

Rust的循环有while和loop 以及 for 三种形式

Loop 循环

rust
fn main() {
    let mut x = 0;
    loop {
        x += 1;
        if x == 75 {
            break;
        }
    }
    println!("{}", x);
}

loop 可以被中断以返回一个值。

从循环中返回值

rust
fn main() {
    let mut x = 0;
    let v = loop {
        x += 1;
        if x == 30 {
            break "found the 30";
        }
    };
    println!("from loop: {}", v);
}

While 循环

rust
fn main() {
    let mut x = 0;
    while x != 75 {
        x += 1;
    }

    println!("{}", x)
}

For 循环

for循环可以更方便的实现便利元素

rust
fn main() {
    for x in 0..5 {
        println!("{}", x);
    }

    for x in 0..=5 {
        println!("{}", x);
    }
}