File Input/Output

C++:

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main () {
    ofstream ofile("example.txt");
    ofile << "Sample line 1" << endl;
    ofile << "Sample line 2" << endl;
    ofile.close();

    ifstream ifile("example.txt");
    string line;
    while (getline(ifile, line))
    {
        cout << line << endl;
    }
    ifile.close();

    return 0;
}

Rust :

use std::fs::File;
use std::io::{BufRead, BufReader, Write};

fn main()
{
    let mut ofile = File::create("example.txt").unwrap();
    ofile.write_all("Sample line 1\n".as_bytes());
    ofile.write_all("Sample line 2\n".as_bytes());
    ofile.flush();

    let ifile = File::open("example.txt").unwrap();
    let ifile = BufReader::new(ifile);
    for line in ifile.lines() 
    {
        println!("{}", line.unwrap());
    }
}

Similar to the chapter "Console Input/Output", you should ignore warning messages regarding error handling in this program. You can read about how I/O errors are handled in the official tutorials.