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<a href="#define-members">Macros</a> &#124;
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<div class="headertitle"><div class="title">exponential_search.c File Reference</div></div>
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<p><a href="https://github.com/TheAlgorithms/Algorithms-Explanation/blob/master/en/Search%20Algorithms/Exponential%20Search.md" target="_blank">Exponential Search</a>
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;assert.h&gt;</code><br />
<code>#include &lt;inttypes.h&gt;</code><br />
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Include dependency graph for exponential_search.c:</div>
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Macros</h2></td></tr>
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#define&#160;</td><td class="memItemRight" valign="bottom"><b>ELEMENT</b>&#160;&#160;&#160;-10</td></tr>
<tr class="memdesc:aa5e9be47d76a4e1865914bcb7a2a7479"><td class="mdescLeft">&#160;</td><td class="mdescRight">for assert for int64_t, uint16_t <br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:aae97ef76c065e91c188f1f8c8076869a"><td class="memItemLeft" align="right" valign="top">int64_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../da/d6c/exponential__search_8c.html#aae97ef76c065e91c188f1f8c8076869a">binary_search</a> (const int64_t *arr, const uint16_t l_index, const uint16_t r_index, const int64_t n)</td></tr>
<tr class="memdesc:aae97ef76c065e91c188f1f8c8076869a"><td class="mdescLeft">&#160;</td><td class="mdescRight">used to perform the binary search over the given array <a href="../../da/d6c/exponential__search_8c.html#aae97ef76c065e91c188f1f8c8076869a">More...</a><br /></td></tr>
<tr class="separator:aae97ef76c065e91c188f1f8c8076869a"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a82d4de0907b9601a376febf50955bacd"><td class="memItemLeft" align="right" valign="top">int64_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../da/d6c/exponential__search_8c.html#a82d4de0907b9601a376febf50955bacd">exponential_search</a> (const int64_t *arr, const uint16_t length, const int64_t n)</td></tr>
<tr class="memdesc:a82d4de0907b9601a376febf50955bacd"><td class="mdescLeft">&#160;</td><td class="mdescRight">used to perform the exponential search over the given array <a href="../../da/d6c/exponential__search_8c.html#a82d4de0907b9601a376febf50955bacd">More...</a><br /></td></tr>
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<tr class="memitem:aa8dca7b867074164d5f45b0f3851269d"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../da/d6c/exponential__search_8c.html#aa8dca7b867074164d5f45b0f3851269d">test</a> ()</td></tr>
<tr class="memdesc:aa8dca7b867074164d5f45b0f3851269d"><td class="mdescLeft">&#160;</td><td class="mdescRight">used to run the self-test implementations <a href="../../da/d6c/exponential__search_8c.html#aa8dca7b867074164d5f45b0f3851269d">More...</a><br /></td></tr>
<tr class="separator:aa8dca7b867074164d5f45b0f3851269d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../da/d6c/exponential__search_8c.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Main function. <a href="../../da/d6c/exponential__search_8c.html#ae66f6b31b5ad750f1fe042a706a4e3d4">More...</a><br /></td></tr>
<tr class="separator:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p ><a href="https://github.com/TheAlgorithms/Algorithms-Explanation/blob/master/en/Search%20Algorithms/Exponential%20Search.md" target="_blank">Exponential Search</a> </p>
<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/faridevnz" target="_blank">Alessio Farinelli</a> </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="aae97ef76c065e91c188f1f8c8076869a" name="aae97ef76c065e91c188f1f8c8076869a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aae97ef76c065e91c188f1f8c8076869a">&#9670;&#160;</a></span>binary_search()</h2>
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<td class="memname">int64_t binary_search </td>
<td>(</td>
<td class="paramtype">const int64_t *&#160;</td>
<td class="paramname"><em>arr</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const uint16_t&#160;</td>
<td class="paramname"><em>l_index</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const uint16_t&#160;</td>
<td class="paramname"><em>r_index</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const int64_t&#160;</td>
<td class="paramname"><em>n</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>used to perform the binary search over the given array </p>
<p >Function: binary_search.</p>
<p >algorithm that search the index of the given item</p>
<p >recursive function that search the given element in </p>
<h2><a class="anchor" id="autotoc_md75"></a>
the array using the &lt;a href="https://github.com/TheAlgorithms/Algorithms-Explanation/blob/master/en/Search%20Algorithms/Binary%20Search.md" target="_blank" &gt;Binary Search&lt;/a&gt;</h2>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">arr</td><td>array where search the element </td></tr>
<tr><td class="paramname">l_index</td><td>start index of the array (arr) to apply the algorithm </td></tr>
<tr><td class="paramname">r_index</td><td>end index of the array (arr) to apply the algorithm </td></tr>
<tr><td class="paramname">n</td><td>element to find in the array (arr)</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>the index of the element (n) in the array (arr) </dd>
<dd>
-1 if the n element wasn't found </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 56</span>{</div>
<div class="line"><span class="lineno"> 57</span> <span class="comment">// calculate the middle index of the array</span></div>
<div class="line"><span class="lineno"> 58</span> uint16_t middle_index = l_index + ( r_index - l_index ) / 2;</div>
<div class="line"><span class="lineno"> 59</span> <span class="comment">// base cases</span></div>
<div class="line"><span class="lineno"> 60</span> <span class="keywordflow">if</span> ( l_index &gt; r_index ) { <span class="keywordflow">return</span> -1; }</div>
<div class="line"><span class="lineno"> 61</span> <span class="keywordflow">if</span> ( arr[middle_index] == n ) { <span class="keywordflow">return</span> middle_index; }</div>
<div class="line"><span class="lineno"> 62</span> <span class="comment">// recursion</span></div>
<div class="line"><span class="lineno"> 63</span> <span class="keywordflow">if</span> ( arr[middle_index] &gt; n ) { <span class="keywordflow">return</span> <a class="code hl_function" href="../../da/d6c/exponential__search_8c.html#aae97ef76c065e91c188f1f8c8076869a">binary_search</a>(arr, l_index, middle_index-1, n); } <span class="comment">// left</span></div>
<div class="line"><span class="lineno"> 64</span> <span class="keywordflow">return</span> <a class="code hl_function" href="../../da/d6c/exponential__search_8c.html#aae97ef76c065e91c188f1f8c8076869a">binary_search</a>(arr, middle_index+1, r_index, n); <span class="comment">// right</span></div>
<div class="line"><span class="lineno"> 65</span>}</div>
<div class="ttc" id="aexponential__search_8c_html_aae97ef76c065e91c188f1f8c8076869a"><div class="ttname"><a href="../../da/d6c/exponential__search_8c.html#aae97ef76c065e91c188f1f8c8076869a">binary_search</a></div><div class="ttdeci">int64_t binary_search(const int64_t *arr, const uint16_t l_index, const uint16_t r_index, const int64_t n)</div><div class="ttdoc">used to perform the binary search over the given array</div><div class="ttdef"><b>Definition:</b> exponential_search.c:55</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a82d4de0907b9601a376febf50955bacd">&#9670;&#160;</a></span>exponential_search()</h2>
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<td class="memname">int64_t exponential_search </td>
<td>(</td>
<td class="paramtype">const int64_t *&#160;</td>
<td class="paramname"><em>arr</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const uint16_t&#160;</td>
<td class="paramname"><em>length</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const int64_t&#160;</td>
<td class="paramname"><em>n</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>used to perform the exponential search over the given array </p>
<p >Function: exponential_search.</p>
<p >algorithm that search the index of the given item</p>
<p >recursive function that take an array and quickly find the range </p>
<h2><a class="anchor" id="autotoc_md74"></a>
where to apply the binary search algorithm to find the given element</h2>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">arr</td><td>array where search the element </td></tr>
<tr><td class="paramname">length</td><td>the total length of the given array (arr) </td></tr>
<tr><td class="paramname">n</td><td>element to find in the array (arr)</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>the index of the element (n) in the array (arr) </dd>
<dd>
-1 if the element wasn't found </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 29</span>{</div>
<div class="line"><span class="lineno"> 30</span> <span class="keywordflow">if</span> ( length == 0 ) { <span class="keywordflow">return</span> -1; }</div>
<div class="line"><span class="lineno"> 31</span> <span class="comment">// find the upperbound</span></div>
<div class="line"><span class="lineno"> 32</span> uint32_t upper_bound = 1;</div>
<div class="line"><span class="lineno"> 33</span> <span class="keywordflow">while</span> ( upper_bound &lt;= length &amp;&amp; arr[upper_bound] &lt; n ) { upper_bound = upper_bound * 2; }</div>
<div class="line"><span class="lineno"> 34</span> <span class="comment">// calculate the range ( between lower_boud and upper_bound )</span></div>
<div class="line"><span class="lineno"> 35</span> uint16_t lower_bound = upper_bound/2;</div>
<div class="line"><span class="lineno"> 36</span> <span class="keywordflow">if</span> ( upper_bound &gt; length ) { upper_bound = length; }</div>
<div class="line"><span class="lineno"> 37</span> <span class="comment">// apply the binary search in the range</span></div>
<div class="line"><span class="lineno"> 38</span> <span class="keywordflow">return</span> <a class="code hl_function" href="../../da/d6c/exponential__search_8c.html#aae97ef76c065e91c188f1f8c8076869a">binary_search</a>(arr, lower_bound, upper_bound, n);</div>
<div class="line"><span class="lineno"> 39</span>}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&#160;</a></span>main()</h2>
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<td class="memname">int main </td>
<td>(</td>
<td class="paramtype">void&#160;</td>
<td class="paramname"></td><td>)</td>
<td></td>
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<p>Main function. </p>
<dl class="section return"><dt>Returns</dt><dd>0 on exit </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 72</span>{</div>
<div class="line"><span class="lineno"> 73</span> <a class="code hl_function" href="../../da/d6c/exponential__search_8c.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// run self-test implementations</span></div>
<div class="line"><span class="lineno"> 74</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 75</span>}</div>
<div class="ttc" id="aexponential__search_8c_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../da/d6c/exponential__search_8c.html#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">used to run the self-test implementations</div><div class="ttdef"><b>Definition:</b> exponential_search.c:81</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#aa8dca7b867074164d5f45b0f3851269d">&#9670;&#160;</a></span>test()</h2>
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<td class="memname">static void test </td>
<td>(</td>
<td class="paramtype">void&#160;</td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">static</span></span> </td>
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<p>used to run the self-test implementations </p>
<p >Self-test implementations.</p>
<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 82</span>{</div>
<div class="line"><span class="lineno"> 83</span> <span class="comment">// empty array</span></div>
<div class="line"><span class="lineno"> 84</span> int64_t arr_empty[] = {};</div>
<div class="line"><span class="lineno"> 85</span> assert(<a class="code hl_function" href="../../da/d6c/exponential__search_8c.html#a82d4de0907b9601a376febf50955bacd">exponential_search</a>(arr_empty, 0, 10) == -1);</div>
<div class="line"><span class="lineno"> 86</span> <span class="comment">// elent not found</span></div>
<div class="line"><span class="lineno"> 87</span> int64_t arr_found[] = {1, 2, 3};</div>
<div class="line"><span class="lineno"> 88</span> assert(<a class="code hl_function" href="../../da/d6c/exponential__search_8c.html#a82d4de0907b9601a376febf50955bacd">exponential_search</a>(arr_found, 3, 10) == -1);</div>
<div class="line"><span class="lineno"> 89</span> <span class="comment">// element found in an array of length 1</span></div>
<div class="line"><span class="lineno"> 90</span> int64_t arr_one[] = {1};</div>
<div class="line"><span class="lineno"> 91</span> assert(<a class="code hl_function" href="../../da/d6c/exponential__search_8c.html#a82d4de0907b9601a376febf50955bacd">exponential_search</a>(arr_found, 1, 1) == 0);</div>
<div class="line"><span class="lineno"> 92</span> <span class="comment">// find the first element in an array of length 2</span></div>
<div class="line"><span class="lineno"> 93</span> int64_t arr_first_2[] = {1, 2};</div>
<div class="line"><span class="lineno"> 94</span> assert(<a class="code hl_function" href="../../da/d6c/exponential__search_8c.html#a82d4de0907b9601a376febf50955bacd">exponential_search</a>(arr_first_2, 2, 1) == 0);</div>
<div class="line"><span class="lineno"> 95</span> <span class="comment">// find the last element in an array of length 2</span></div>
<div class="line"><span class="lineno"> 96</span> int64_t arr_last_2[] = {1, 2};</div>
<div class="line"><span class="lineno"> 97</span> assert(<a class="code hl_function" href="../../da/d6c/exponential__search_8c.html#a82d4de0907b9601a376febf50955bacd">exponential_search</a>(arr_last_2, 2, 2) == 1);</div>
<div class="line"><span class="lineno"> 98</span> <span class="comment">// find the first element in an array of length n</span></div>
<div class="line"><span class="lineno"> 99</span> int64_t arr_first_n[] = {-1, 2, 4, 6, 8};</div>
<div class="line"><span class="lineno"> 100</span> assert(<a class="code hl_function" href="../../da/d6c/exponential__search_8c.html#a82d4de0907b9601a376febf50955bacd">exponential_search</a>(arr_first_n, 5, -1) == 0);</div>
<div class="line"><span class="lineno"> 101</span> <span class="comment">// find the last element in an array of length n</span></div>
<div class="line"><span class="lineno"> 102</span> int64_t arr_last_n[] = {-1, 2, 4, 6, 8};</div>
<div class="line"><span class="lineno"> 103</span> assert(<a class="code hl_function" href="../../da/d6c/exponential__search_8c.html#a82d4de0907b9601a376febf50955bacd">exponential_search</a>(arr_last_n, 5, 8) == 4);</div>
<div class="line"><span class="lineno"> 104</span> <span class="comment">// find an element in an array of length n</span></div>
<div class="line"><span class="lineno"> 105</span> int64_t arr_middle[] = {-1, 2, 4, 6, 8};</div>
<div class="line"><span class="lineno"> 106</span> assert(<a class="code hl_function" href="../../da/d6c/exponential__search_8c.html#a82d4de0907b9601a376febf50955bacd">exponential_search</a>(arr_middle, 5, 6) == 3);</div>
<div class="line"><span class="lineno"> 107</span>}</div>
<div class="ttc" id="aexponential__search_8c_html_a82d4de0907b9601a376febf50955bacd"><div class="ttname"><a href="../../da/d6c/exponential__search_8c.html#a82d4de0907b9601a376febf50955bacd">exponential_search</a></div><div class="ttdeci">int64_t exponential_search(const int64_t *arr, const uint16_t length, const int64_t n)</div><div class="ttdoc">used to perform the exponential search over the given array</div><div class="ttdef"><b>Definition:</b> exponential_search.c:28</div></div>
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