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<div id="projectbrief">Set of algorithms implemented in C.</div>
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<a href="#func-members">Functions</a> </div>
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<div class="headertitle"><div class="title">binary_search.c File Reference</div></div>
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<p>Program to perform <a href="https://en.wikipedia.org/wiki/Binary_search_algorithm" target="_blank">binary search</a> of a target value in a given <em>sorted</em> array.
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<a href="#details">More...</a></p>
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<div class="textblock"><code>#include <assert.h></code><br />
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<code>#include <stdio.h></code><br />
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</div><div class="textblock"><div class="dynheader">
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Include dependency graph for binary_search.c:</div>
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<div class="dyncontent">
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<div class="center"><iframe scrolling="no" frameborder="0" src="../../d0/d91/binary__search_8c__incl.svg" width="184" height="111"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe>
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</div><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:a40855c608ca64048d04cff6526f0a582"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d3b/binary__search_8c.html#a40855c608ca64048d04cff6526f0a582">binarysearch1</a> (const int *arr, int l, int r, int x)</td></tr>
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<tr class="memdesc:a40855c608ca64048d04cff6526f0a582"><td class="mdescLeft"> </td><td class="mdescRight">Recursive implementation. <br /></td></tr>
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<tr class="separator:a40855c608ca64048d04cff6526f0a582"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a908fd6d2ad0bba33f63f8454888a0032"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d3b/binary__search_8c.html#a908fd6d2ad0bba33f63f8454888a0032">binarysearch2</a> (const int *arr, int l, int r, int x)</td></tr>
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<tr class="memdesc:a908fd6d2ad0bba33f63f8454888a0032"><td class="mdescLeft"> </td><td class="mdescRight">Iterative implementation. <br /></td></tr>
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<tr class="separator:a908fd6d2ad0bba33f63f8454888a0032"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ae1a3968e7947464bee7714f6d43b7002"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d3b/binary__search_8c.html#ae1a3968e7947464bee7714f6d43b7002">test</a> ()</td></tr>
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<tr class="memdesc:ae1a3968e7947464bee7714f6d43b7002"><td class="mdescLeft"> </td><td class="mdescRight">Test implementations. <br /></td></tr>
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<tr class="separator:ae1a3968e7947464bee7714f6d43b7002"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a840291bc02cba5474a4cb46a9b9566fe"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d3b/binary__search_8c.html#a840291bc02cba5474a4cb46a9b9566fe">main</a> (void)</td></tr>
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<tr class="memdesc:a840291bc02cba5474a4cb46a9b9566fe"><td class="mdescLeft"> </td><td class="mdescRight">Main function. <br /></td></tr>
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<tr class="separator:a840291bc02cba5474a4cb46a9b9566fe"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Program to perform <a href="https://en.wikipedia.org/wiki/Binary_search_algorithm" target="_blank">binary search</a> of a target value in a given <em>sorted</em> array. </p>
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<dl class="section author"><dt>Authors</dt><dd><a href="https://github.com/theycallmemac" target="_blank">James McDermott</a> - recursive algorithm </dd>
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<dd>
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<a href="https://github.com/kvedala" target="_blank">Krishna Vedala</a> - iterative algorithm </dd></dl>
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</div><h2 class="groupheader">Function Documentation</h2>
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<a id="a40855c608ca64048d04cff6526f0a582" name="a40855c608ca64048d04cff6526f0a582"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a40855c608ca64048d04cff6526f0a582">◆ </a></span>binarysearch1()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<td class="memname">int binarysearch1 </td>
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<td>(</td>
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<td class="paramtype">const int * </td>
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<td class="paramname"><em>arr</em>, </td>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">int </td>
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<td class="paramname"><em>l</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">int </td>
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<td class="paramname"><em>r</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">int </td>
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<td class="paramname"><em>x</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</div><div class="memdoc">
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<p>Recursive implementation. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">arr</td><td>array to search </td></tr>
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<tr><td class="paramdir"></td><td class="paramname">l</td><td>left index of search range </td></tr>
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<tr><td class="paramdir"></td><td class="paramname">r</td><td>right index of search range </td></tr>
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<tr><td class="paramdir"></td><td class="paramname">x</td><td>target value to search for </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>location of x assuming array arr[l..r] is present </dd>
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<dd>
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-1 otherwise </dd></dl>
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<div class="fragment"><div class="line"><span class="lineno"> 22</span>{</div>
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<div class="line"><span class="lineno"> 23</span> <span class="keywordflow">if</span> (r >= l)</div>
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<div class="line"><span class="lineno"> 24</span> {</div>
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<div class="line"><span class="lineno"> 25</span> <span class="keywordtype">int</span> mid = l + (r - l) / 2;</div>
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<div class="line"><span class="lineno"> 26</span> </div>
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<div class="line"><span class="lineno"> 27</span> <span class="comment">// If element is present at middle</span></div>
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<div class="line"><span class="lineno"> 28</span> <span class="keywordflow">if</span> (arr[mid] == x)</div>
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<div class="line"><span class="lineno"> 29</span> <span class="keywordflow">return</span> mid;</div>
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<div class="line"><span class="lineno"> 30</span> </div>
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<div class="line"><span class="lineno"> 31</span> <span class="comment">// If element is smaller than middle</span></div>
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<div class="line"><span class="lineno"> 32</span> <span class="keywordflow">if</span> (arr[mid] > x)</div>
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<div class="line"><span class="lineno"> 33</span> <span class="keywordflow">return</span> <a class="code hl_function" href="../../df/d3b/binary__search_8c.html#a40855c608ca64048d04cff6526f0a582">binarysearch1</a>(arr, l, mid - 1, x);</div>
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<div class="line"><span class="lineno"> 34</span> </div>
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<div class="line"><span class="lineno"> 35</span> <span class="comment">// Else element is in right subarray</span></div>
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<div class="line"><span class="lineno"> 36</span> <span class="keywordflow">return</span> <a class="code hl_function" href="../../df/d3b/binary__search_8c.html#a40855c608ca64048d04cff6526f0a582">binarysearch1</a>(arr, mid + 1, r, x);</div>
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<div class="line"><span class="lineno"> 37</span> }</div>
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<div class="line"><span class="lineno"> 38</span> </div>
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<div class="line"><span class="lineno"> 39</span> <span class="comment">// When element is not present in array</span></div>
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<div class="line"><span class="lineno"> 40</span> <span class="keywordflow">return</span> -1;</div>
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<div class="line"><span class="lineno"> 41</span>}</div>
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<div class="ttc" id="abinary__search_8c_html_a40855c608ca64048d04cff6526f0a582"><div class="ttname"><a href="../../df/d3b/binary__search_8c.html#a40855c608ca64048d04cff6526f0a582">binarysearch1</a></div><div class="ttdeci">int binarysearch1(const int *arr, int l, int r, int x)</div><div class="ttdoc">Recursive implementation.</div><div class="ttdef"><b>Definition:</b> binary_search.c:21</div></div>
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</div><!-- fragment --><div class="dynheader">
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Here is the call graph for this function:</div>
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<div class="dyncontent">
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<div class="center"><iframe scrolling="no" frameborder="0" src="../../df/d3b/binary__search_8c_a40855c608ca64048d04cff6526f0a582_cgraph.svg" width="114" height="60"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe>
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<a id="a908fd6d2ad0bba33f63f8454888a0032" name="a908fd6d2ad0bba33f63f8454888a0032"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a908fd6d2ad0bba33f63f8454888a0032">◆ </a></span>binarysearch2()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<td class="memname">int binarysearch2 </td>
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<td>(</td>
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<td class="paramtype">const int * </td>
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<td class="paramname"><em>arr</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">int </td>
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<td class="paramname"><em>l</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">int </td>
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<td class="paramname"><em>r</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">int </td>
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<td class="paramname"><em>x</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Iterative implementation. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">arr</td><td>array to search </td></tr>
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<tr><td class="paramdir"></td><td class="paramname">l</td><td>left index of search range </td></tr>
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<tr><td class="paramdir"></td><td class="paramname">r</td><td>right index of search range </td></tr>
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<tr><td class="paramdir"></td><td class="paramname">x</td><td>target value to search for </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>location of x assuming array arr[l..r] is present </dd>
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<dd>
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-1 otherwise </dd></dl>
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<div class="fragment"><div class="line"><span class="lineno"> 52</span>{</div>
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<div class="line"><span class="lineno"> 53</span> <span class="keywordtype">int</span> mid = l + (r - l) / 2;</div>
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<div class="line"><span class="lineno"> 54</span> </div>
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<div class="line"><span class="lineno"> 55</span> <span class="keywordflow">while</span> (arr[mid] != x)</div>
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<div class="line"><span class="lineno"> 56</span> {</div>
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<div class="line"><span class="lineno"> 57</span> <span class="keywordflow">if</span> (r <= l || r < 0)</div>
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<div class="line"><span class="lineno"> 58</span> <span class="keywordflow">return</span> -1;</div>
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<div class="line"><span class="lineno"> 59</span> </div>
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<div class="line"><span class="lineno"> 60</span> <span class="keywordflow">if</span> (arr[mid] > x)</div>
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<div class="line"><span class="lineno"> 61</span> <span class="comment">// If element is smaller than middle</span></div>
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<div class="line"><span class="lineno"> 62</span> r = mid - 1;</div>
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<div class="line"><span class="lineno"> 63</span> <span class="keywordflow">else</span></div>
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<div class="line"><span class="lineno"> 64</span> <span class="comment">// Else element is in right subarray</span></div>
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<div class="line"><span class="lineno"> 65</span> l = mid + 1;</div>
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<div class="line"><span class="lineno"> 66</span> </div>
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<div class="line"><span class="lineno"> 67</span> mid = l + (r - l) / 2;</div>
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<div class="line"><span class="lineno"> 68</span> }</div>
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<div class="line"><span class="lineno"> 69</span> </div>
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<div class="line"><span class="lineno"> 70</span> <span class="comment">// When element is not present in array</span></div>
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<div class="line"><span class="lineno"> 71</span> <span class="keywordflow">return</span> mid;</div>
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<div class="line"><span class="lineno"> 72</span>}</div>
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</div><!-- fragment -->
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</div>
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<a id="a840291bc02cba5474a4cb46a9b9566fe" name="a840291bc02cba5474a4cb46a9b9566fe"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a840291bc02cba5474a4cb46a9b9566fe">◆ </a></span>main()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">int main </td>
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<td>(</td>
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<td class="paramtype">void </td>
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<td class="paramname"></td><td>)</td>
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<td></td>
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<p>Main function. </p>
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<div class="fragment"><div class="line"><span class="lineno"> 106</span>{</div>
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<div class="line"><span class="lineno"> 107</span> <a class="code hl_function" href="../../df/d3b/binary__search_8c.html#ae1a3968e7947464bee7714f6d43b7002">test</a>();</div>
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<div class="line"><span class="lineno"> 108</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><span class="lineno"> 109</span>}</div>
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<div class="ttc" id="abinary__search_8c_html_ae1a3968e7947464bee7714f6d43b7002"><div class="ttname"><a href="../../df/d3b/binary__search_8c.html#ae1a3968e7947464bee7714f6d43b7002">test</a></div><div class="ttdeci">void test()</div><div class="ttdoc">Test implementations.</div><div class="ttdef"><b>Definition:</b> binary_search.c:75</div></div>
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<a id="ae1a3968e7947464bee7714f6d43b7002" name="ae1a3968e7947464bee7714f6d43b7002"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ae1a3968e7947464bee7714f6d43b7002">◆ </a></span>test()</h2>
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<td class="memname">void test </td>
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<td>(</td>
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<td class="paramtype">void </td>
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<p>Test implementations. </p>
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<div class="fragment"><div class="line"><span class="lineno"> 76</span>{</div>
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<div class="line"><span class="lineno"> 77</span> <span class="comment">// give function an array to work with</span></div>
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<div class="line"><span class="lineno"> 78</span> <span class="keywordtype">int</span> arr[] = {2, 3, 4, 10, 40};</div>
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<div class="line"><span class="lineno"> 79</span> <span class="comment">// get size of array</span></div>
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<div class="line"><span class="lineno"> 80</span> <span class="keywordtype">int</span> n = <span class="keyword">sizeof</span>(arr) / <span class="keyword">sizeof</span>(arr[0]);</div>
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<div class="line"><span class="lineno"> 81</span> </div>
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<div class="line"><span class="lineno"> 82</span> printf(<span class="stringliteral">"Test 1.... "</span>);</div>
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<div class="line"><span class="lineno"> 83</span> <span class="comment">// set value to look for</span></div>
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<div class="line"><span class="lineno"> 84</span> <span class="keywordtype">int</span> x = 10;</div>
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<div class="line"><span class="lineno"> 85</span> <span class="comment">// set result to what is returned from binarysearch</span></div>
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<div class="line"><span class="lineno"> 86</span> <span class="keywordtype">int</span> result = <a class="code hl_function" href="../../df/d3b/binary__search_8c.html#a40855c608ca64048d04cff6526f0a582">binarysearch1</a>(arr, 0, n - 1, x);</div>
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<div class="line"><span class="lineno"> 87</span> assert(result == 3);</div>
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<div class="line"><span class="lineno"> 88</span> printf(<span class="stringliteral">"passed recursive... "</span>);</div>
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<div class="line"><span class="lineno"> 89</span> result = <a class="code hl_function" href="../../df/d3b/binary__search_8c.html#a908fd6d2ad0bba33f63f8454888a0032">binarysearch2</a>(arr, 0, n - 1, x);</div>
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<div class="line"><span class="lineno"> 90</span> assert(result == 3);</div>
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<div class="line"><span class="lineno"> 91</span> printf(<span class="stringliteral">"passed iterative...\n"</span>);</div>
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<div class="line"><span class="lineno"> 92</span> </div>
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<div class="line"><span class="lineno"> 93</span> printf(<span class="stringliteral">"Test 2.... "</span>);</div>
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<div class="line"><span class="lineno"> 94</span> x = 5;</div>
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<div class="line"><span class="lineno"> 95</span> <span class="comment">// set result to what is returned from binarysearch</span></div>
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<div class="line"><span class="lineno"> 96</span> result = <a class="code hl_function" href="../../df/d3b/binary__search_8c.html#a40855c608ca64048d04cff6526f0a582">binarysearch1</a>(arr, 0, n - 1, x);</div>
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<div class="line"><span class="lineno"> 97</span> assert(result == -1);</div>
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<div class="line"><span class="lineno"> 98</span> printf(<span class="stringliteral">"passed recursive... "</span>);</div>
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<div class="line"><span class="lineno"> 99</span> result = <a class="code hl_function" href="../../df/d3b/binary__search_8c.html#a908fd6d2ad0bba33f63f8454888a0032">binarysearch2</a>(arr, 0, n - 1, x);</div>
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<div class="line"><span class="lineno"> 100</span> assert(result == -1);</div>
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<div class="line"><span class="lineno"> 101</span> printf(<span class="stringliteral">"passed iterative...\n"</span>);</div>
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<div class="line"><span class="lineno"> 102</span>}</div>
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<div class="ttc" id="abinary__search_8c_html_a908fd6d2ad0bba33f63f8454888a0032"><div class="ttname"><a href="../../df/d3b/binary__search_8c.html#a908fd6d2ad0bba33f63f8454888a0032">binarysearch2</a></div><div class="ttdeci">int binarysearch2(const int *arr, int l, int r, int x)</div><div class="ttdoc">Iterative implementation.</div><div class="ttdef"><b>Definition:</b> binary_search.c:51</div></div>
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