use tokio;

#[tokio::test]
async fn f64_tests() {
    println!("{:?}", 0.3f64 - 0.1f64);
    println!("{:?}", 0.3f64 - 0.2f64);
}

#[cfg(test)]
mod tests {
    use std::time::{Instant, Duration};

    #[test]
    // 计算十秒内能执行多少次f64计算
    fn test_f64_subtraction_performance() {
        // 在AMD Ryzen 7 5800X 8-Core Processor下，f64平均每秒可以计算2300w次~2600w次（1位小数）
        let mut count = 0u64;
        let num = 0.3f64 - 0.2f64;
        let seconds = 10;

        let start = Instant::now();
        while start.elapsed() < Duration::from_secs(seconds) {
            let _ = 0.3f64 - 0.2f64;
            count += 1;
        }

        println!("Performed {} f64 subtractions in one second(avg), result is {}.", count / seconds, num);
    }
}