Re: [Dev-C++] Lookup tables, with bsearch, lsearch, qsort etc.

[Per W. <pw...@ia...>]

Lookup tables are used when the lookup parameter is non-numeric or
non-sequential.

In your case, it would be easier with a normal vector and direct indexing
after checking that PaperSize is within valid range.


If your problem had been the reverse, i.e.

height = paperformats["A4"];

a lookup table would have been a possible method to implement the
associative array, with bsearch() to locate the array entry if the array
is sorted, or lsearch() if the array is unsorted.

/Per W

On Wed, 15 Jan 2003, Daniel Glenfield wrote:

>
> I'm trying to understand lookup tables and the bsearch, lsearch, qsort
> functions. I'm trying to create a structure with an integer and a text
> string, and I want to look up the number and get the text associated with
> it. for example, at the moment I have
>
> // BIG switch here
> switch (PaperSize)  // can be 1 - 41
> {
> case 1: ListBox = "Paper Type: Letter";
>         Listbox->AddString(ListBoxChoice);
>         break;
>
> case 2: //... the same again
> //...
> case 41: // same again
>
>
> I'm trying to replace this with a lookup table but I'm finding it difficult
> - examples on the net about bsearch are not quite what I need.
>
>
>
>
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