rust while 循环输出

fn main() {
    use std::time::Instant;
    let now = Instant::now(); //计算耗时

    //=====================================================
    let mut i = 0;
    while i < 10000 {
        // 循环体
        i += 1;
        println!("值为 : {}", i);
    }

    //=====================================================

    //计算耗时
    let duration = now.elapsed();
    let s = duration.as_secs();
    let mut ms = duration.as_millis();
    let mut us = duration.as_micros();
    us -= ms * 1000;
    ms -= s as u128 * 1000;
    println!("耗时：{} s {} ms {} us", s, ms, us);
}

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