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ust语言用println!宏打印一行信息,用print!宏打印信息,行尾不加换行符。
但是用print!宏打印信息后,并不会立即显示。
比如,下面代码会先等待用户输入,然后再打印消息。
use std::io;
fn main() {
print!("Please input your guess:");
let mut guess = String::new();
println!("You guessed: {}", guess);
}
rust标准输出是行缓冲的,只有到行尾才显示,如果想不到行尾直接显示怎么办?答案是手动刷新,方法如下:
use std::io;
fn main() {
print!("Please input your guess:");
io::stdout().flush().expect("Flush err");
let mut guess = String::new();
println!("You guessed: {}", guess);
}
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