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

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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