Ruby no implicit conversion of Fixnum into String (TypeError)

Question

I am trying to answer the following question from Chris Pine\'s \"Learn to Program\" book:

Leap years. Write a program that asks for a starting year and a

Answer 1

This is because the input from gets.chomp is a String. You cannot perform modulo (%) on a String. You need to convert it to an integer first.

Try this...

puts 'What is the starting year?'
starting_year = gets.chomp.to_i
puts 'What is the ending year?'
ending_year = gets.chomp.to_i

while starting_year <= ending_year
  if starting_year%4 == 0 && (starting_year%100 != 0 && starting_year%400 == 0)
    puts starting_year 
  end 
  starting_year+=1
end

Does that work now?

Answer 2

Add a .to_i to your gets.chomp calls. You're trying to do math operations on text. When inputted from the console, everything starts out as text, even if it's numeric looking text.