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copied!<p>The <code><file></code> include tells the preprocessor to search in <code>-I</code> directories and in predefined directories <strong>first</strong>, then in the .c file's directory. The <code>"file"</code> include tells the preprocessor to search the source file's directory <strong>first</strong>, and then revert to <code>-I</code> and predefined. All destinations are searched anyway, only the order of search is different.</p> <p>The 2011 standard mostly discusses the include files in "16.2 Source file inclusion".</p> <blockquote> <p>2 A preprocessing directive of the form</p> <p><code># include <h-char-sequence> new-line</code></p> <p>searches a sequence of implementation-defined places for a header identified uniquely by the specified sequence between the < and > delimiters, and causes the replacement of that directive by the entire contents of the header. How the places are specified or the header identified is implementation-defined.</p> <p>3 A preprocessing directive of the form</p> <p><code># include "q-char-sequence" new-line</code></p> <p>causes the replacement of that directive by the entire contents of the source file identified by the specified sequence between the " delimiters. The named source file is searched for in an implementation-defined manner. If this search is not supported, or if the search fails, the directive is reprocessed as if it read</p> <p><code># include <h-char-sequence> new-line</code></p> <p>with the identical contained sequence (including > characters, if any) from the original directive.</p> </blockquote> <p>Note that <code>"xxx"</code> form degrades to <code><xxx></code> form if the file is not found. The rest is implementation-defined.</p>

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