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<title>On Includes</title>
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<h1>On Includes</h1>
<p>Many programming languages and other computer files have a directive,
often called include (sometimes copy or import), that causes the
contents of a second file to be inserted into the original file. These
included files are called copybooks or header files. They are often used
to define the physical layout of program data, pieces of procedural code
and/or forward declarations while promoting encapsulation and the reuse
of code.</p>
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<p> Source: Wikipedia on Include directive </p>
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