A complete, executable Delphi application consists of multiple unit modules, all tied together by a single source code module called a project file. In traditional Pascal programming, all source code, including the main program, is stored in .pas files. Borland tools use the file extension .dpr to designate the main program source module, while most other source code resides in unit files having the traditional .pas extension. To build a project, the compiler needs the project source file, and either a source file or a compiled unit file for each unit.
Note: Strictly speaking, you need not explicitly use any units in a project, but all programs automatically use the System unit and the Sysinit unit. The source code file for an executable Delphi application contains
Additionally, a Delphi 8 for .NET program may contain a namespaces clause, to specify additional namespaces in which to search for generic units. This topic is covered in more detail in the section Using .NET Namespaces with Delphi.
The compiler, and hence the IDE, expect to find these three elements in a single project (.dpr) file.
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What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.