User Input: Ask for a number

use std.term

fn main() {
    const age = term.prompt_int("Your age?") ?? 0
    print("Next year you will be {age + 1}")
}

Your age? Please type a whole number.Your age? Next year you will be 32

Typed by the user: thirty, then 31. What is typed isn't part of the program's output, so it doesn't show in the box.

"thirty" isn't a number, so prompt_int says so and asks again. You never have to turn the text into a number yourself, or deal with an answer that isn't one. term.prompt_float does the same for numbers like 2.5.