How can I read text in front of a print! message?

Question

I'm trying to make a program that reads any word on the command line and prints it on a new line that's all, what I'm trying to do is something like this:

Some text: hello

But instead I get something like this:

Some text:
Hello

Since using print! instead of println! the phrase "some text" is not printed.

What's going on?

fn main() {
    loop {
        let mut linea = String::new();
        print!("something:\t");
        let ingreso = std::io::stdin().read_line(&mut linea).unwrap();
        println!("{:?}",ingreso);
        if linea == "exit".to_string(){
            break;
        }
    }
}

score 3 · Accepted Answer · answered Jun 06 '20 at 05:34

print! does not flush stdout. You need to import the std::io::Write trait and call std::io::stdout().flush().

Also, the return value from read_line returns how many bytes where read. If you want to print the text that was entered, print the linea variable.

How can I read text in front of a print! message?

1 Answers1