rust test std out
To test the standard output (stdout) in Rust, you can use the std::io::stdout
module from the standard library. Here's an example of how to do it:
use std::io::{self, Write};
fn main() {
let message = "Hello, world!";
// Get a mutable handle to the stdout
let stdout = io::stdout();
let mut handle = stdout.lock();
// Write the message to stdout
handle.write_all(message.as_bytes()).unwrap();
}
In this example, we import the io
module from the std
crate, specifically the Write
trait and the stdout
function. We then define a main
function where we store the message to be printed in a variable called message
.
Next, we obtain a mutable handle to the stdout by calling stdout.lock()
, which returns a StdoutLock
object. We can then use the write_all
method from the Write
trait to write the message to stdout. The as_bytes
method is used to convert the message string into a byte slice.
To run this code and see the output, you can use the cargo run
command in your terminal. The message "Hello, world!" will be printed to the console.
This is a basic example of how to test the standard output in Rust. There are other ways to accomplish this as well, depending on your specific requirements.