Accept only numeric input

Question

I want to force user to enter only numeric value from console. Below is my piece of code that is supposed to do that.

puts \"Enter numeric value: \"
result =         


        

Answer 1

If you mean integer by "numeral", then:

puts "Enter numeric value: "
result = gets.chomp
case result
when /\D/, ""
  puts "Invalid input"
else
  puts "Valid input."
end

It also takes care of empty strings, which would be turned into 0 by to_i, which you probably do not want.