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Re: I need help debugging my program

maestroiut-rubytalk

12/16/2007 11:34:00 AM



----- Original Message ----
> From: Icarus Daedalus <phantom3380@yahoo.co.uk>
> To: ruby-talk ML <ruby-talk@ruby-lang.org>
> Sent: Sunday, December 16, 2007 11:48:23 AM
> Subject: I need help debugging my program
>
> 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.

That is not surprising since Ruby does not automatically cast values
like it is done in other languages.

> puts "What is your name?"
> name = gets.chomp
> puts "How old are you?"
> age = gets.chomp

You may have written the above as

age = gets.chomp.to_i

> age.to_s

Note that does nothing since in your code age is already a string
and you do not use the resulting value.

> puts "What year is it?"

> year = gets.chomp

add a .to_id to get an integer.
and since you do the same thing twice, you could:

def geti
gets.chomp.to_i
end

then use geti and later improve it to detect an incorrect integer format.


> birth = year -= age #*********************************************

Why do you use the -= which has a side effect on the year variable?


birth = year - age

> puts name + " is " + age + " and was born in " + birth

will not work since now you would be adding strings and integers together.

You could write:

puts name + " is " + age.to_s + " and was born in " + birth.to_s

or in more Ruby style:

puts "#{name} is #{age} and was born in #{birth}"

> Any help you could give me would be appreciated. Thanks!

You are most welcome,

Christophe

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