using cmd for ruby

Question

How do you start a new line in cmd when using ruby?
for example, i wanted to say hello world and next line to have a number problem.

puts 'hello world!'
1 + 2

output:
hello world !
3

but instead i get an error. or it does not display the number

Answer 1

Sebastien Pham are you printing the number too like that

puts "hello world! "
puts 1+1

and what error are you facing can you please describe more about that