Wol,
It is not how the compiler deals with the information but how the runtime
engine deals with the data.
I have demonstrated the runtime engine types the data based on how it is
entered in the source code.
A = 1 is typed as a numeric by the runtime engine and A = "1" is typed as a
string. In an earlier
post I provided the following proof.
TST
0001 DEBUG
0002 A = 1
0003 A = "1"
0004 STOP
>RUN XP TST
TST: 2: A = 1
:: S
TST: 3: A = "1"
:: A/
INTEGER: 1
:: S
TST: 4: STOP
:: A/
STRING: T r L=1 `1'
::
The program simply sets the variable A to 1 or "1" and when run it goes in
to debug mode.
I then stepped through each line and displayed the contents of the variable
A by typing A/ as you can
see the runtime engine reports each line as INTEGER or STRING depending on
how the data was entered in the
source code.
Regards,
Stewart
-----Original Message-----
From: Anthony Youngman [mailto:[EMAIL PROTECTED]
Sent: Wednesday, 31 March 2004 19:15
To: U2 Users Discussion List
Subject: RE: Data typing in MV Basic
Why?
Let's work on the basic principal of "coercion occurs when necessary,
and not before".
The compiler detects "1" as a string literal. It stores it as a literal.
The compiler detects 1 as a numeric literal. It stores it as a literal.
(The compiler doesn't give a damn about strings or numerics - a literal
is a literal is a literal)
Therefore 'A = 1' and 'A = "1"' both result in IDENTICAL p-code.
Therefore, unless you know how the compiler works, your conclusion is
demonstrably flawed.
Cheers,
Wol
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Mitchell, Stewart
Sent: 31 March 2004 08:31
To: 'U2 Users Discussion List'
Subject: RE: Data typing in MV Basic
A = 1 is held as an integer
A = "1" is held as a string
A = "1" + 0 is held as an integer
Cheers,
Stewart
-----Original Message-----
From: Anthony Youngman [mailto:[EMAIL PROTECTED]
Sent: Wednesday, 31 March 2004 17:00
To: U2 Users Discussion List
Subject: RE: Data typing in MV Basic
You've missed the point! :-)
These two statements apparently have exactly the same effect - the
question is do they?
A = 1
A = "1"
(In the stuff I'm writing, they'd be the same - everything is a string
until it is forced into numeric.)
Cheers,
Wol
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Jim Garratt
Sent: 31 March 2004 07:39
To: U2 Users Discussion List
Subject: Re: Data typing in MV Basic
Would this not be set by your initialisation of the variable A.
eg A = '' ;*Alpha/Numeric or String
A = 0 ; Numeric
----- Original Message -----
From: "Trevor Ockenden" <[EMAIL PROTECTED]>
To: "U2 Users Discussion List" <[EMAIL PROTECTED]>
Sent: Wednesday, March 31, 2004 2:25 PM
Subject: Re: Data typing in MV Basic
> Will, I stand corrected on that one. So far in 20 odd years of
programming
> in MV I haven't needed to worry about it.
>
> Now Will raises a terrific question. If A = "1" assigns 1 as numeric.
How
> would you determine if A contained a numeric or a string in this case?
>
> My short answer is - why would I need to know? BUT I'm sure somebody
has a
> good answer to that one.
>
> Cheers
>
> Trevor Ockenden
> Open Systems Professionals
>
> ----- Original Message -----
> From: <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, March 31, 2004 4:10 PM
> Subject: Re: Data typing in MV Basic
>
>
> > In a message dated 3/30/2004 8:19:18 PM Pacific Standard Time,
> > [EMAIL PROTECTED] writes:
> >
> >
> > > A = 1 assigns a numeric integer. The expression need not contain
> operators
> > > (+,-,etc) to be numeric.
> > > A = "1" assigns a string however, as you have explicitly declared
it
to
> be
> > > string.
> > > A = "1" + 2 assigns a numeric integer value (3) as the result is
> numeric.
> > > A = "one" + 2 assigns a zero - according to the error message.
> >
> > yes
> > no
> > yes
> > yes
> >
> > they all assign numerics imho
> > "1" is cast as a numeric because the system is smart enough to
realize
its
> a
> > numeric string and has no purpose casting it as a string
> > Any idea how to test which it is?
> > Will
> > --
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> >
>
>
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