oke,

On 87 I have to made a choice so the user can choose between a Vcat and a VCham so one animal and one gauge. I have then to think how I can prevent that whn the user chooses a Vcham petting does not work.


Thanks for the help.

Roelof



Op 26-6-2012 16:38, Matthias Felleisen schreef:

On Jun 26, 2012, at 10:21 AM, Roelof Wobben wrote:

Sorry for the confusion.

I meant exercise 87 and 88 on the stable version of HtpD/2e.

So the questions I have should be :

Is it correct that on exercise 87 of How to design Programms I have to make 2 gauges and two animals.
And is exercise 88 part 1 not the same as exercise 56 ?


Roelof


I usually don't send out rich-text emails so sorry:


Exercise 87: ...

Design a world program that works with both cats and chameleons:
; A VAnimal is _either_
; – a VCat
; – a VCham

versus

Design a virtual pet program that supports both a virtual cat and a virtual chameleon.

The underline/bold should help -- Matthias



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