File Input Output in Rust

Published on 28 April 2022 (Updated: 18 September 2022)

File Input Output in Rust

Welcome to the File Input Output in Rust page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

use std::fs::File;
use std::io::prelude::*;
use std::io::Result;

fn write_file() -> Result<()> {
    let mut out = File::create("output.txt")?;

    let bytes_written = out.write(b"A line of text written to this file in Rust!\n").unwrap_or(0);
    let bytes_written2 = out.write(b"Another line also written by a Rust program!\n").unwrap_or(0);

    if bytes_written == 0 || bytes_written2 == 0 {
        ()
    }

    out.flush()?;

    Ok(())
}

fn read_file() -> Result<()> {
    let mut in_file = File::open("output.txt")?;

    let mut line = String::new();
    match in_file.read_to_string(&mut line) {
        Ok(_)   =>  println!("{}", line),
        Err(_)  =>  panic!("Could not read contents into string!")
    }

    Ok(())
}

fn main() -> Result<()> {
    write_file()?;
    Ok(read_file()?)
}

File Input Output in Rust was written by:

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.