如何避免在Rust中使用stdin换行 [英] How to avoid going to new line with stdin in Rust

问题描述

我有此代码:

fn main() {
    let mut stdin = io::stdin();
    let input = &mut String::new();

    loop {
        input.clear();
        print!("Your age: ");
        stdin.read_line(input);
        print!("{}", input);
    }
}

因此，当我输入某些内容时，程序将返回您的年龄:"加上我的输入. 但是，当我运行程序时，我不想在新行中编写输入. 要在Python中执行类似的操作，我可以编写:

So when I input something, the programs returns "Your age:" plus my input. But when I run the program I don't want to write the input in a new line. To do something like that in Python, I can write:

var = input("Your age: ")

如何避免换行?我敢肯定这很简单，但我真的不知道该怎么做，我尝试了很多不同的方法...

How can I avoid going to a new line? I'm sure it's simple but I really can't realize how to do that, I tried a lot of different stuff...

推荐答案

在读取以下行之前，您需要先刷新stdout:

You need to flush stdout before reading the line:

use std::io::{self, Write};

fn main() {
    let mut stdin = io::stdin();
    let input = &mut String::new();

    loop {
        input.clear();
        print!("Your age: ");
        io::stdout().flush();
        stdin.read_line(input);
        print!("{}", input);
    }
}

从 print!文档:

请注意，默认情况下，stdout通常是行缓冲的，因此可能有必要使用io::stdout().flush()来确保立即发出输出.

Note that stdout is frequently line-buffered by default so it may be necessary to use io::stdout().flush() to ensure the output is emitted immediately.

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