dev-cpp-users

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

[Daniel G. <sp...@ho...>]

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

[Ioannis V. <no...@ho...>]

=46rom standard library you can use map, etc. =0D
 =0D
 =0D
 =0D
Ioannis Vranos=0D
 =0D
* Programming pages: http://www.noicys.freeurl.com=0D
* Alternative URL: http://run.to/noicys  =0D
 =0D
 =0D
-------Original Message-------=0D
 =0D
From: Daniel Glenfield=0D
Date: Wednesday, 15 January 2003 5:59:53 PM=0D
To: dev...@li...=0D
Subject: [Dev-C++] Lookup tables, with bsearch, lsearch, qsort etc.=0D
 =0D
I'm trying to understand lookup tables and the bsearch, lsearch, qsort =0D
functions. I'm trying to create a structure with an integer and a text =0D
string, and I want to look up the number and get the text associated with=
 =0D
it. for example, at the moment I have=0D
 =0D
// BIG switch here=0D
switch (PaperSize) // can be 1 - 41=0D
{=0D
case 1: ListBox =3D "Paper Type: Letter";=0D
Listbox->AddString(ListBoxChoice);=0D
break;=0D
 =0D
case 2: //... the same again=0D
//...=0D
case 41: // same again=0D
 =0D
 =0D
I'm trying to replace this with a lookup table but I'm finding it difficu=
lt =0D
- examples on the net about bsearch are not quite what I need.

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.
>
>
>
>
> _________________________________________________________________
> Add photos to your e-mail with MSN 8. Get 2 months FREE*.
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