println

fn println(string s) -> Result<int, IoError>

use io::sync::{println};

Writes s and a newline to standard output.

The usual way to print. It returns a Result like all IO, so write println(…)?; in a function that can return the error (main can). Build the text with string::format.

Parameters#

Returns#

Result<int, IoError>

Errors#

Returns Err when standard output cannot be written (for example, a closed pipe).

Examples#

use io::sync::{println};
use string::{format};

fn main() {
    println("Hello, Coil!")?;
    println(format("%i + %i = %i", 2, 2, 2 + 2))?;
}

See also#

• Result
• string::format
• write_all: Writes all of buf to s, waiting whenever the stream is not ready.
• read_exact: Fills all of buf from s, waiting whenever no data is ready.
• read_to_end: Reads from s until it ends and returns everything read.
• accept_wait: Waits for the next connection on a TCP listener and returns its stream.
• recv_from_wait: Waits for a UDP datagram, reads it into buf, and returns (bytes, sender host, sender port).
• send_to_wait: Sends buf as one UDP datagram to host:port, waiting while the socket is not ready.