macro_rules! print { ($($arg:tt)*) => { ... }; }
Prints to the standard output.
Equivalent to the println!
macro except that a newline is not printed at the end of the message.
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.
Use print!
only for the primary output of your program. Use eprint!
instead to print error and progress messages.
Panics if writing to io::stdout()
fails.
use std::io::{self, Write}; print!("this "); print!("will "); print!("be "); print!("on "); print!("the "); print!("same "); print!("line "); io::stdout().flush().unwrap(); print!("this string has a newline, why not choose println! instead?\n"); io::stdout().flush().unwrap();
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/macro.print.html