// exru7.ru  write and read  text files

use std::io::Write;   // for write
use std::io::Read;    // for first read
use std::fs;          // for second read

fn main() // write 3 lines to out.txt, then read out.txt
{
  println!("exru7.ru running");
  // write 3 lines to  out.txt
  let mut file_ref = std::fs::File::create("out.txt").expect("create failed");
   
  file_ref.write_all("Hello World\n".as_bytes()).expect("write failed");
  file_ref.write_all("Hello India\n".as_bytes()).expect("write failed");
  file_ref.write_all("last line  3\n".as_bytes()).expect("write failed");
  println!("Text written into file  out.txt");
  
  // first read  out.txt
  let mut file_ref = std::fs::File::open("out.txt").unwrap();
  let mut data = String::new();
   
  file_ref.read_to_string(&mut data).unwrap();
  println!("read  data= {:?}",data); 

  // second read  out.txt
  let file_name = "out.txt";

  let file_content = fs::read_to_string(file_name)
            .expect("Failed to read the file");
  println!("from second read: "); 
  println!("out.txt= {:?}",file_content);
  println!(" ");
  println!("\nFile contents:\n-----------\n{}\n", file_content);
  
  println!("exru7.ru finished");
}