struct Person {
    first_name: String,
    last_name: String,
    age: u8,
}
fn main() {
    let first_name = ask_for_a_string("What is your first name?");
    let last_name = ask_for_a_string("What is your last name?");
    let age = ask_for_a_number("How old are you?").unwrap_or(0);
    let person = Person {
        first_name,
        last_name,
        age,
    };
    println!(
        "{}\n{}\n{}",
        person.first_name, person.last_name, person.age
    );
}
use std::str::FromStr;
fn read_string() -> String {
    let mut input = String::new();
    std::io::stdin()
        .read_line(&mut input)
        .expect("can not read user input");
    input.trim().to_string()
}
fn read_number() -> Result<u8, String> {
    let input = read_string();
    if input.is_empty() {
        Err("You did not enter any data".to_string())
    } else {
        u8::from_str(&input).or(Err("You've entered an invalid number".to_string()))
    }
}
fn ask_for_a_string(question: &str) -> String {
    print!("{} ", question);
    read_string()
}
fn ask_for_a_number(question: &str) -> Result<u8, String> {
    print!("{} ", question);
    read_number()
}

(Playground)

Output:

What is your first name? What is your last name? How old are you? h
q
1

Errors:

   Compiling playground v0.0.1 (/playground)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.74s
     Running `target/debug/playground`

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