I wrote a simple program which works:
a = 4.to_s(2)
puts a.reverse
I want to be able to change it based on input from the user in the terminal. This is what I wrote:
puts 'Please enter a number you would like to see expressed in binary form'
i = gets.chomp
b = i.to_s(2)
puts b
This is the error that I keep getting:
`to_s': wrong number of arguments(1 for 0) (ArgumentError)
You're starting with a string, so you need to convert it:
i.to_i.to_s(2)
The #to_s method on a string doesn't take any arguments.
You do not need the chomp method, #to_i will take care of it.
Write it as:
puts 'Please enter a number you would like to see expressed in binary form'
i = gets.to_i
b = i.to_s(2)
puts b
You are calling to_s on an string, not on integer as you are thinking, because Kernel#gets always gives you a String object.
First, convert it to Fixnum, then call Fixnum#to_s on the Fixnum instance, which takes an argument, but String#to_s doesn't accept arguments, which was why you got a complaint from Ruby.
It seems that you want to use Fixnum#to_s but in your program gets.chomp returns a string, so you actually call String#to_s
You can could do:
i = gets.chomp.to_i
Fixnum#to_s was redefined?(6*9).to_s(13) returns "42" which makes this method pretty handy.
4or2?