/Rust/Rust enter number from keyboard / stdin

Rust enter number from keyboard / stdin

use std::io;

// Request number
println!("Enter number? ");
let mut input = String::new();
io::stdin().read_line(&mut input).expect("Failed to read line");
let bint: i32 = input.trim()
  .parse()
  .ok()
  .expect("Program only processes numbers, Enter number");    
println!("Square {}", bint * bint); // use number

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