Gets.chomp input comparison returning an error

Question

I AM USING RUBY

ERROR: comparison of Integer with String failed (ArgumentError)

puts "Age: "
    age = gets.chomp
    if 0 < age < 130

I want the programm to allow the user to input all the numbers between 0 (not included) and 130 (included). How to do it?

From `:stdin` you receive strings. You need to convert it to integer before comparison: `0 < age.to_i < 130`. — Aleksei Matiushkin, Jul 26 '18 at 13:24

score 3 · Accepted Answer · answered Jul 26 '18 at 13:24

3

The input is a string. Try something like this

puts "Age: "
user_input = gets.chomp
begin
  age = Integer(user_input)
  # your code
rescue ArgumentError
  puts "Age must be an integer"
end

answered Jul 26 '18 at 13:24

Ursus

Using `Integer()` over `to_i` is good as `to_i` will return zero for non-numeric strings. – Kris Jul 26 '18 at 13:29
What (begin) rescue (end) stands for? – Onionixed Jul 26 '18 at 13:33
BUT HOW TO ALLOW USER ONLY TO INPUT INTEGERS BETWEEN 0 AND 130? – Onionixed Jul 26 '18 at 14:06
The same way you were doing :) – Ursus Jul 26 '18 at 14:07
This time your age is an integer. Oh, just, you can't do `< age <`. You need something like `if age >= 0 && age <= 130` – Ursus Jul 26 '18 at 14:08
`begin` and `rescue` are used to check and recover from errors – Ursus Jul 26 '18 at 14:08
Another way is using a range `if (0..130).include?(age)` – Ursus Jul 26 '18 at 14:15

1 Answers1