LISTBOX indexes

[mark smit]

Hello all...

Why is it that the DDT functions in PBDLL use one for the LISTBOX base index and the default WindowsAPI use a zero based index?

Cheers!

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Cheers

[Lance Edmonds]

It's just traditional. Many things in the Basic language set originate with the base of 1 rather than zero.

For example, reading the first character from a string would be done with the reference of 1 (ie, MID$(A$,1,n)); Binary files (by default) have a base equal to 1; etc...

I'm sure you get my drift.



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Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

[Michael Mattias]

It's just traditional. Many things in the Basic language set originate with the base of 1 rather than zero.
For example, reading the first character from a string would be done with the reference of 1 (ie, MID$(A$,1,n)); Binary files (by default) have a base equal to 1; etc...

Binary files in PB *for WINDOWS* originate at one; binary files in PB/DOS used zero as the default. Microsoft BASICs use zero by default.

PB's main "indexed" tool, the array, uses zero; of course, I don't think I've ever seen a BASIC with 1-based default arrays.

I don't think it's traditional: it's more or less that both PB and Microsoft had to pick "something" for listbox indexes, and just happened to choose differently.

MCM

[Lance Edmonds]

Michael, you are correct in that the default base for binary files is zero in PB/DOS, but this is not really pertinent given that the question centers around the DDT LISTBOX control in the PowerBASIC for Windows forum...

Besides, there are still other items use a "base" of 1, such as DATACOUNT, READ$(), PARSECOUNT, PARSE$(), LEN(), SIZEOF(), etc.


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Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>