//to int
let str_number = "42";
//the first method
let number1: i32 = str_number.parse().unwrap();
//the second method
let number2 = str_number.parse::<i32>().unwrap();

//to Double and Float
//the first method
let str_pi = "3.14";
let pi: f32 = str_pi.parse().unwrap();

//the second method
let str_exp = "2.71828";
let exp = str_exp.parse::<f64>().unwrap();

//the third method
let str_half = "0,5";
let half = str_half
    .replace(",", ".")
    .parse::<f32>().unwrap();

println!("number1 is {number1}");
println!("number2 is {number2}");
println!("pi is {pi}");
println!("exp is {exp}");
println!("half is {half}");