use of method in ruby program

program for ruby:

#method#

def addition

@arg1=gets.chomp
@arg2=gets.chomp

puts "addition of two numbers :"
puts "What is  @arg1 + @arg2 ? "

@arg3 =@arg1.to_i - @arg2.to_i
puts "#@arg3"

end
puts "enter 2 nos"
addition

OUTPUT
enter 2 nos
23
3
addition of two numbers :
What is  @arg1 + @arg2 ?
20