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<p><a href="https://en.wikipedia.org/wiki/Shell_sort">Shell sort</a> algorithm
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;cassert&gt;</code><br />
<code>#include &lt;cstdlib&gt;</code><br />
<code>#include &lt;ctime&gt;</code><br />
<code>#include &lt;iostream&gt;</code><br />
<code>#include &lt;utility&gt;</code><br />
<code>#include &lt;vector&gt;</code><br />
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Include dependency graph for shell_sort2.cpp:</div>
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<tr class="memdesc:d5/d91/namespacesorting"><td class="mdescLeft">&#160;</td><td class="mdescRight">Sorting algorithms. <br /></td></tr>
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Functions</h2></td></tr>
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<tr class="memitem:a7eb77daed2cf1513f6d68c47a1c2db1c"><td class="memTemplItemLeft" align="right" valign="top">int&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="../../d4/d7a/shell__sort2_8cpp.html#a7eb77daed2cf1513f6d68c47a1c2db1c">compare</a> (const void *<a class="el" href="../../d7/d35/matrix__exponentiation_8cpp.html#a9ecd98ce0064e2f7f97bb6a92f58ee72">a</a>, const void *b)</td></tr>
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<tr class="memitem:a22ea0d1f7943ebb4371d31e44b465b6d"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d4/d7a/shell__sort2_8cpp.html#a22ea0d1f7943ebb4371d31e44b465b6d">test_f</a> (const int NUM_DATA)</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://en.wikipedia.org/wiki/Shell_sort">Shell sort</a> algorithm </p>
<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/kvedala">Krishna Vedala</a> </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="a7eb77daed2cf1513f6d68c47a1c2db1c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a7eb77daed2cf1513f6d68c47a1c2db1c">&#9670;&nbsp;</a></span>compare()</h2>
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template&lt;typename T &gt; </div>
<table class="memname">
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<td class="memname">int <a class="el" href="../../d1/db3/structcompare.html">compare</a> </td>
<td>(</td>
<td class="paramtype">const void *&#160;</td>
<td class="paramname"><em>a</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const void *&#160;</td>
<td class="paramname"><em>b</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>function to compare sorting using cstdlib's qsort </p>
<div class="fragment"><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; {</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; T arg1 = *<span class="keyword">static_cast&lt;</span><span class="keyword">const </span>T *<span class="keyword">&gt;</span>(<a class="code" href="../../d7/d35/matrix__exponentiation_8cpp.html#a9ecd98ce0064e2f7f97bb6a92f58ee72">a</a>);</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; T arg2 = *<span class="keyword">static_cast&lt;</span><span class="keyword">const </span>T *<span class="keyword">&gt;</span>(b);</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; </div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; <span class="keywordflow">if</span> (arg1 &lt; arg2)</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; <span class="keywordflow">return</span> -1;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <span class="keywordflow">if</span> (arg1 &gt; arg2)</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; </div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; <span class="comment">// return (arg1 &gt; arg2) - (arg1 &lt; arg2); // possible shortcut</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; <span class="comment">// return arg1 - arg2; // erroneous shortcut (fails if INT_MIN is present)</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;}</div>
</div><!-- fragment -->
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<h2 class="memtitle"><span class="permalink"><a href="#a0ddf1224851353fc92bfbff6f499fa97">&#9670;&nbsp;</a></span>main()</h2>
<div class="memitem">
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<td class="memname">int main </td>
<td>(</td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>argc</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">char *&#160;</td>
<td class="paramname"><em>argv</em>[]&#160;</td>
</tr>
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<td></td>
<td>)</td>
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<p>Main function </p>
<div class="fragment"><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160; {</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160; <span class="comment">// initialize random number generator - once per program</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/numeric/random/srand.html">std::srand</a>(<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/time.html">std::time</a>(NULL));</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160; </div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160; <a class="code" href="../../d4/d7a/shell__sort2_8cpp.html#a895b313cb2671e8f712040460325573e">test_int</a>(100); <span class="comment">// test with sorting random array of 100 values</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Test 1 - 100 int values - passed. \n&quot;</span>;</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160; <a class="code" href="../../d4/d7a/shell__sort2_8cpp.html#a895b313cb2671e8f712040460325573e">test_int</a>(1000); <span class="comment">// test with sorting random array of 1000 values</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Test 2 - 1000 int values - passed.\n&quot;</span>;</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160; <a class="code" href="../../d4/d7a/shell__sort2_8cpp.html#a895b313cb2671e8f712040460325573e">test_int</a>(10000); <span class="comment">// test with sorting random array of 10000 values</span></div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Test 3 - 10000 int values - passed.\n&quot;</span>;</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>&#160; </div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>&#160; <a class="code" href="../../d4/d7a/shell__sort2_8cpp.html#a22ea0d1f7943ebb4371d31e44b465b6d">test_f</a>(100); <span class="comment">// test with sorting random array of 100 values</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Test 1 - 100 float values - passed. \n&quot;</span>;</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>&#160; <a class="code" href="../../d4/d7a/shell__sort2_8cpp.html#a22ea0d1f7943ebb4371d31e44b465b6d">test_f</a>(1000); <span class="comment">// test with sorting random array of 1000 values</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Test 2 - 1000 float values - passed.\n&quot;</span>;</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>&#160; <a class="code" href="../../d4/d7a/shell__sort2_8cpp.html#a22ea0d1f7943ebb4371d31e44b465b6d">test_f</a>(10000); <span class="comment">// test with sorting random array of 10000 values</span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Test 3 - 10000 float values - passed.\n&quot;</span>;</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>&#160; </div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>&#160; <span class="keywordtype">int</span> i, NUM_DATA;</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>&#160; </div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>&#160; <span class="keywordflow">if</span> (argc == 2)</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>&#160; NUM_DATA = <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/byte/atoi.html">atoi</a>(argv[1]);</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>&#160; NUM_DATA = 200;</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>&#160; </div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>&#160; <span class="comment">// int array = new int[NUM_DATA];</span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>&#160; <span class="keywordtype">int</span> *<a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a> = <span class="keyword">new</span> <span class="keywordtype">int</span>[NUM_DATA];</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>&#160; <span class="comment">// int array2 = new int[NUM_DATA];</span></div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>&#160; <span class="keywordtype">int</span> range = 1800;</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>&#160; </div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/numeric/random/srand.html">std::srand</a>(<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/time.html">time</a>(NULL));</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>&#160; <span class="keywordflow">for</span> (i = 0; i &lt; NUM_DATA; i++) {</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>&#160; <span class="comment">// allocate random numbers in the given range</span></div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>&#160; <a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a>[i] = (<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/numeric/random/rand.html">std::rand</a>() % range) - (range &gt;&gt; 1);</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>&#160; }</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>&#160; </div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Unsorted original data: &quot;</span> &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>&#160; <a class="code" href="../../d4/d7a/shell__sort2_8cpp.html#a951127aea9d7e1e53ea9ae0868633246">show_data</a>(<a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a>, NUM_DATA);</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock_t.html">std::clock_t</a> start = <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock.html">std::clock</a>();</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>&#160; <a class="code" href="../../d5/d91/namespacesorting.html#af2c5b92cbfe73f63f6074c61b0a45331">shell_sort</a>(<a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a>, NUM_DATA); <span class="comment">// perform sorting</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock_t.html">std::clock_t</a> <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">end</a> = <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock.html">std::clock</a>();</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>&#160; </div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>&#160; &lt;&lt; <span class="stringliteral">&quot;Data Sorted using custom implementation: &quot;</span> &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>&#160; <a class="code" href="../../d4/d7a/shell__sort2_8cpp.html#a951127aea9d7e1e53ea9ae0868633246">show_data</a>(<a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a>, NUM_DATA);</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>&#160; </div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>&#160; <span class="keywordtype">double</span> elapsed_time = (<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">end</a> - start) * 1.<a class="code" href="../../d4/d32/fibonacci__fast_8cpp.html#a3ba232425d45f9e9c0b87a8cf7ab69d9">f</a> / CLOCKS_PER_SEC;</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Time spent sorting: &quot;</span> &lt;&lt; elapsed_time &lt;&lt; <span class="stringliteral">&quot;s\n&quot;</span> &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>&#160; </div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>&#160; <span class="keyword">delete</span>[] <a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a>;</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>&#160; <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>&#160;}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a951127aea9d7e1e53ea9ae0868633246">&#9670;&nbsp;</a></span>show_data() <span class="overload">[1/2]</span></h2>
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template&lt;class T &gt; </div>
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<td class="memname">void show_data </td>
<td>(</td>
<td class="paramtype">T *&#160;</td>
<td class="paramname"><em>arr</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t&#160;</td>
<td class="paramname"><em>LEN</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
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<p>pretty print array </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">arr</td><td>array to print </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">LEN</td><td>length of array to print </td></tr>
</table>
</dd>
</dl>
<div class="fragment"><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160; {</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160; <span class="keywordtype">size_t</span> i;</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160; </div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160; <span class="keywordflow">for</span> (i = 0; i &lt; LEN; i++) {</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; arr[i] &lt;&lt; <span class="stringliteral">&quot;, &quot;</span>;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160; }</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a63aaff7cabfa3da2da8b9477b5fad9d6">&#9670;&nbsp;</a></span>show_data() <span class="overload">[2/2]</span></h2>
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template&lt;typename T , size_t N&gt; </div>
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<td class="memname">void show_data </td>
<td>(</td>
<td class="paramtype">T(&amp;)&#160;</td>
<td class="paramname"><em>arr</em>[N]</td><td>)</td>
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<p>pretty print array </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">arr</td><td>array to print </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">N</td><td>length of array to print </td></tr>
</table>
</dd>
</dl>
<div class="fragment"><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; {</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; <a class="code" href="../../d4/d7a/shell__sort2_8cpp.html#a951127aea9d7e1e53ea9ae0868633246">show_data</a>(arr, N);</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a22ea0d1f7943ebb4371d31e44b465b6d">&#9670;&nbsp;</a></span>test_f()</h2>
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<td class="memname">void test_f </td>
<td>(</td>
<td class="paramtype">const int&#160;</td>
<td class="paramname"><em>NUM_DATA</em></td><td>)</td>
<td></td>
</tr>
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<p>Test implementation of shell_sort on float arrays by comparing results against <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/algorithm/qsort.html">std::qsort</a>. </p>
<div class="fragment"><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; {</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; <span class="comment">// int array = new int[NUM_DATA];</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; <span class="keywordtype">float</span> *<a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a> = <span class="keyword">new</span> <span class="keywordtype">float</span>[NUM_DATA];</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160; <span class="keywordtype">float</span> *data2 = <span class="keyword">new</span> <span class="keywordtype">float</span>[NUM_DATA];</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160; <span class="comment">// int array2 = new int[NUM_DATA];</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160; <span class="keywordtype">int</span> range = 1000;</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160; </div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; NUM_DATA; i++) {</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160; <a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a>[i] = data2[i] = ((<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/numeric/random/rand.html">std::rand</a>() % range) - (range &gt;&gt; 1)) / 100.;</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160; }</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160; </div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160; <span class="comment">/* sort using our implementation */</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock_t.html">std::clock_t</a> start = <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock.html">std::clock</a>();</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160; <a class="code" href="../../d5/d91/namespacesorting.html#af2c5b92cbfe73f63f6074c61b0a45331">shell_sort</a>(<a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a>, NUM_DATA);</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock_t.html">std::clock_t</a> <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">end</a> = <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock.html">std::clock</a>();</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160; <span class="keywordtype">double</span> elapsed_time = <span class="keyword">static_cast&lt;</span><span class="keywordtype">double</span><span class="keyword">&gt;</span>(<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">end</a> - start) / CLOCKS_PER_SEC;</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Time spent sorting using shell_sort2: &quot;</span> &lt;&lt; elapsed_time</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160; &lt;&lt; <span class="stringliteral">&quot;s\n&quot;</span>;</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160; </div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160; <span class="comment">/* sort using std::qsort */</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160; start = <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock.html">std::clock</a>();</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/algorithm/qsort.html">std::qsort</a>(data2, NUM_DATA, <span class="keyword">sizeof</span>(data2[0]), <a class="code" href="../../d1/db3/structcompare.html">compare&lt;float&gt;</a>);</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">end</a> = <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock.html">std::clock</a>();</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160; </div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160; elapsed_time = <span class="keyword">static_cast&lt;</span><span class="keywordtype">double</span><span class="keyword">&gt;</span>(<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">end</a> - start) / CLOCKS_PER_SEC;</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Time spent sorting using std::qsort: &quot;</span> &lt;&lt; elapsed_time</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160; &lt;&lt; <span class="stringliteral">&quot;s\n&quot;</span>;</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160; </div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; NUM_DATA; i++) {</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160; assert(<a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a>[i] == data2[i]); <span class="comment">// ensure that our sorting results match</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160; <span class="comment">// the standard results</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160; }</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160; </div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160; <span class="keyword">delete</span>[] <a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a>;</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160; <span class="keyword">delete</span>[] data2;</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160;}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a895b313cb2671e8f712040460325573e">&#9670;&nbsp;</a></span>test_int()</h2>
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<td class="memname">void test_int </td>
<td>(</td>
<td class="paramtype">const int&#160;</td>
<td class="paramname"><em>NUM_DATA</em></td><td>)</td>
<td></td>
</tr>
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<p>Test implementation of shell_sort on integer arrays by comparing results against <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/algorithm/qsort.html">std::qsort</a>. </p>
<div class="fragment"><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; {</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <span class="comment">// int array = new int[NUM_DATA];</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; <span class="keywordtype">int</span> *<a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a> = <span class="keyword">new</span> <span class="keywordtype">int</span>[NUM_DATA];</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; <span class="keywordtype">int</span> *data2 = <span class="keyword">new</span> <span class="keywordtype">int</span>[NUM_DATA];</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; <span class="comment">// int array2 = new int[NUM_DATA];</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; <span class="keywordtype">int</span> range = 1800;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; </div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; NUM_DATA; i++)</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; <a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a>[i] = data2[i] = (<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/numeric/random/rand.html">std::rand</a>() % range) - (range &gt;&gt; 1);</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; </div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; <span class="comment">/* sort using our implementation */</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock_t.html">std::clock_t</a> start = <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock.html">std::clock</a>();</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; <a class="code" href="../../d5/d91/namespacesorting.html#af2c5b92cbfe73f63f6074c61b0a45331">shell_sort</a>(<a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a>, NUM_DATA);</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock_t.html">std::clock_t</a> <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">end</a> = <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock.html">std::clock</a>();</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; <span class="keywordtype">double</span> elapsed_time = <span class="keyword">static_cast&lt;</span><span class="keywordtype">double</span><span class="keyword">&gt;</span>(<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">end</a> - start) / CLOCKS_PER_SEC;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Time spent sorting using shell_sort2: &quot;</span> &lt;&lt; elapsed_time</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; &lt;&lt; <span class="stringliteral">&quot;s\n&quot;</span>;</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; </div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; <span class="comment">/* sort using std::qsort */</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; start = <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock.html">std::clock</a>();</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/algorithm/qsort.html">std::qsort</a>(data2, NUM_DATA, <span class="keyword">sizeof</span>(data2[0]), <a class="code" href="../../d1/db3/structcompare.html">compare&lt;int&gt;</a>);</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">end</a> = <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/chrono/c/clock.html">std::clock</a>();</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; </div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; elapsed_time = <span class="keyword">static_cast&lt;</span><span class="keywordtype">double</span><span class="keyword">&gt;</span>(<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">end</a> - start) / CLOCKS_PER_SEC;</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Time spent sorting using std::qsort: &quot;</span> &lt;&lt; elapsed_time</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; &lt;&lt; <span class="stringliteral">&quot;s\n&quot;</span>;</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160; </div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; NUM_DATA; i++) {</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; assert(<a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a>[i] == data2[i]); <span class="comment">// ensure that our sorting results match</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; <span class="comment">// the standard results</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160; }</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; <span class="keyword">delete</span>[] <a class="code" href="../../d1/df3/hash__search_8cpp.html#a6e1a77282bc65ad359d753d25df23243">data</a>;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160; <span class="keyword">delete</span>[] data2;</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160;}</div>
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