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

Try regular expressions, like this:

puts "Enter numeric value: "
result = gets

if result =~ /^-?[0-9]+$/
    puts "Valid input"
else
    puts "Invalid input."
end

The example above allows only digits [0..9]. If you want to read not only integers, you can allow a dot as well: ^-?[0-9]+$/. Read more about regexp in Ruby: http://ruby-doc.org/core-2.2.0/Regexp.html