application breaks on line16

string to double

use std::io;

fn main() {
	let i_default: u64 = 4;
	let d_default: f64 = 4.0;
	let s_default = "HackerRank ".to_string();

	let mut input = String::new();

	println!("Type second integer!");
	io::stdin().read_line(&mut input).unwrap();
	let i_input: u64 = input.trim().parse().unwrap();

	println!("Type second double!");
	io::stdin().read_line(&mut input).unwrap();
	let d_input: f64 = input.trim().parse().unwrap();

	println!("Type second string!");
	io::stdin().read_line(&mut input).unwrap();
	let s_input = input.trim();

	println!("{}\n{}\n{}", i_default + i_input, d_default + d_input, s_default + &s_input);
}