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257: Mainline

When you define a structure, you tell C about the variables that describe the objects that belong to that structure.

*--------------------------------------------* 
| Description of variables:                  | <-- Description of the 
|   for example, price and number            |     trade structure 
*--------------------------------------------* 
      ^               ^               ^          
      | Instance of   | Instance of   | Instance of     
      |               |               |          
*------------*  *------------*  *------------*   
| price 10.2 |  | price 12.0 |  | price 13.2 | <-- Descriptions of   
| number 600 |  | number 100 |  | number 200 |     particular trade 
*------------*  *------------*  *------------*     objects