Re: Beginners Guide Euphoria
On Sat, 8 Feb 1997, David Mosley wrote:
>The problem I am having is
> that when I try to declare a varable it keeps telling me that I am
> wrong(e.g. c = c + 1) When I try to declare C I write atom c --It tells
> me this is wrong so I try object c or integer c--but those are wrong too.I
> have reread the frist part over again and looked in the manual and I can,t
> see anything wrong HELP?
> P.S. When I say I have "reread the frist part over again" I mean that I
> have printed your data.doc out on my printer I find that it works good as a
> refrence when I am try write a program.Hope that is ok! please tell me if
> it is not.
In the beginning of your code (usually) you declare you variables like
this:
atom c
It doesn't give it ANY INITIAL VALUE WHEN YOU DECLARE IT. Unlike Basic,
which just quietly assigns it to 0, Euphoria DOESN'T. Before you can go
c=c+1, you need to give a an initial value. At the program start, you may
say c=0 or whatever, then you are freee to add, subtract, or whatever to
it, as long as you use legal values. If c is declared as an integer, you
can't add fractional values to it (like c=c+.5). If c is an atom, you can
add fractional values to it, but you can't add sequences to it, like
c=c+{1,2,3,4}. If c is declared as a sequence or an object you can do
all of the above.
If c is the sequence {1,2,3,4} and you go c=c+1, you get c={2,3,4,5}. If
c is a sequence of sequences like {{1,2},{3,4},{5,6}} c=c+1 gives
c={{2,3},{4,5},{6,7}}
I hope this helps...
Michael Packard
Lord Generic Productions
lgp at exo.com http://exo.com/~lgp
A Crash Course in Game Design and Production
http://exo.com/~lgp/euphoria
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