What does "birth = year -= age" try to do?

Tek

On Dec 16, 2007, at 7:48 PM, Icarus Daedalus wrote:

> I'm new to Ruby and I'm trying out a very basic user input program.  
> The
> codes below and also I've indicated the line giving me grief.
>
> puts "What is your name?"
> name = gets.chomp
> puts "How old are you?"
> age = gets.chomp
> age.to_s
> puts "What year is it?"
> year = gets.chomp
> birth = year -= age #*********************************************
> puts name + " is " + age + " and was born in " + birth