Borland® Delphi™ 6 Developer's Guide

Units

Units are the individual source code modules that make up a Pascal program. A unit is a place for you to group functions and procedures that can be called from your main program. To be a unit, a source module must consist of at least three parts:

• A unit statement—Every unit must have as its first line a statement saying that it's a unit and identifying the unit name. The name of the unit must always match the filename. For example, if you have a file named FooBar, the statement would be

  unit FooBar;
  

• The interface part—After the unit statement, a unit's next functional line of code should be the interface statement. Everything following this statement, up to the implementation statement, is information that can be shared with your program ...