Exiting in the middle of the program

Ruby
1

Good-Day to you all, programmers!

There is a ruby calculator in the /ruby installation folder which has
the ability of that when you just type ‘Exit’, the program exits.

How can I add this feature to a program built by myself? So when I type
‘Exit’ in the middle of the program, the program exits …

2

On Mar 19, 4:05 pm, Helgitomas G. [email protected]
wrote:

There is a ruby calculator in the /ruby installation folder which has
the ability of that when you just type ‘Exit’, the program exits.

How can I add this feature to a program built by myself? So when I type
‘Exit’ in the middle of the program, the program exits …

RTFM :slight_smile:

C:>ri Kernel#exit

Kernel#exit
exit(integer=0)
Kernel::exit(integer=0)
Process::exit(integer=0)

 Initiates the termination of the Ruby script by raising the
 +SystemExit+ exception. This exception may be caught. The

optional
parameter is used to return a status code to the invoking
environment.

    begin
      exit
      puts "never get here"
    rescue SystemExit
      puts "rescued a SystemExit exception"
    end
    puts "after begin block"

 _produces:_

    rescued a SystemExit exception
    after begin block

 Just prior to termination, Ruby executes any +at_exit+ functions
 (see Kernel::at_exit) and runs any object finalizers (see
 ObjectSpace::define_finalizer).

    at_exit { puts "at_exit function" }
    ObjectSpace.define_finalizer("string",  proc { puts "in

finalizer" })
exit

 _produces:_

    at_exit function
    in finalizer
3

Helgitomas G. wrote:

Good-Day to you all, programmers!

There is a ruby calculator in the /ruby installation folder which has
the ability of that when you just type ‘Exit’, the program exits.

How can I add this feature to a program built by myself? So when I type
‘Exit’ in the middle of the program, the program exits …

I’m pretty sure those examples are there just so you can see how to do
things with Ruby. Why don’t you just look at the program, figure out how
it’s doing it, and then do it the same way in your program?

4

Errm… That does not tell me what code to put in the program to exit
it…

Example:

  1. puts ‘Hello there’
  2. puts ‘What’s your name?’
  3. puts ’ ’
  4. name = gets.chomp
  5. puts ’ ’
  7. if name == ‘John’
  8. puts ‘Nice name!’
  9. end
  11. if name == ‘Mary’
  12. puts ‘What a beautiful name!’
  13. end

Now. If I’d like to exit the program without typing the name, just say
“exit”, what code should I put?

Can I only say:

if name == ‘exit’
exit
end

?

5

if name == ‘exit’
exit
end

Yes. But why didn’t you try ? You’d have seen by yourself :slight_smile:

Haha, lol. I will try the case thingy =D THX

6
  1. if name == ‘John’
  2. puts ‘Nice name!’
  3. end
  5. if name == ‘Mary’
  6. puts ‘What a beautiful name!’
  7. end

Wow, I really recommend you look around to the “case” statement.
And the ‘star’ (*) operator (this one is tricky : it can either make
an array from separated vars or splat an existing array into several
separate stuff).

case name
when “John”, “Johnny” ; puts “nice name”
when * girls_name ; puts “beautiful name”
when “exit” ; exit 0
else puts name
end

if name == ‘exit’
exit
end

Yes. But why didn’t you try ? You’d have seen by yourself :slight_smile:

7

Yes,

if name == ‘exit’
exit
end

will get you an exit, or you can also put ‘’ without the word exit and
an empty entry will exit the program as well.

code:
if name = = ’ ’
exit
end

~Kay~