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<title>Algorithms_in_C++: bit_manipulation/count_of_set_bits.cpp File Reference</title>
<title>TheAlgorithms/C++: bit_manipulation/count_of_set_bits.cpp File Reference</title>
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<div id="projectname">Algorithms_in_C++<span id="projectnumber">&#160;1.0.0</span>
<div id="projectname">TheAlgorithms/C++<span id="projectnumber">&#160;1.0.0</span>
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<div id="projectbrief">Set of algorithms implemented in C++.</div>
<div id="projectbrief">All the algorithms implemented in C++</div>
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@@ -121,7 +138,9 @@ Include dependency graph for count_of_set_bits.cpp:</div>
<div class="dyncontent">
<div class="center"><iframe scrolling="no" frameborder="0" src="../../dd/d9f/count__of__set__bits_8cpp__incl.svg" width="255" height="126"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe></div>
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<p><a href="../../da/db8/count__of__set__bits_8cpp_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="namespaces" name="namespaces"></a>
Namespaces</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">namespace &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d81/namespacebit__manipulation.html">bit_manipulation</a></td></tr>
@@ -133,7 +152,7 @@ Namespaces</h2></td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:a86c98dc299e4db28b73e08309d977e62" id="r_a86c98dc299e4db28b73e08309d977e62"><td class="memItemLeft" align="right" valign="top"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint64_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a86c98dc299e4db28b73e08309d977e62">bit_manipulation::count_of_set_bits::countSetBits</a> (std ::int64_t n)</td></tr>
<tr class="memitem:a86c98dc299e4db28b73e08309d977e62" id="r_a86c98dc299e4db28b73e08309d977e62"><td class="memItemLeft" align="right" valign="top">std::uint64_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a86c98dc299e4db28b73e08309d977e62">bit_manipulation::count_of_set_bits::countSetBits</a> (std ::int64_t n)</td></tr>
<tr class="memdesc:a86c98dc299e4db28b73e08309d977e62"><td class="mdescLeft">&#160;</td><td class="mdescRight">The main function implements set bit count. <br /></td></tr>
<tr class="separator:a86c98dc299e4db28b73e08309d977e62"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa8dca7b867074164d5f45b0f3851269d" id="r_aa8dca7b867074164d5f45b0f3851269d"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#aa8dca7b867074164d5f45b0f3851269d">test</a> ()</td></tr>
@@ -148,6 +167,8 @@ Functions</h2></td></tr>
<p>A binary number consists of two digits. They are 0 &amp; 1. Digit 1 is known as set bit in computer terms. Worst Case Time Complexity: O(log n) Space complexity: O(1) </p><dl class="section author"><dt>Author</dt><dd><a href="https://github.com/Swastyy" target="_blank">Swastika Gupta</a> </dd>
<dd>
<a href="https://github.com/prashant-th18" target="_blank">Prashant Thakur</a> </dd></dl>
<p class="definition">Definition in file <a class="el" href="../../da/db8/count__of__set__bits_8cpp_source.html">count_of_set_bits.cpp</a>.</p>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="a86c98dc299e4db28b73e08309d977e62" name="a86c98dc299e4db28b73e08309d977e62"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a86c98dc299e4db28b73e08309d977e62">&#9670;&#160;</a></span>countSetBits()</h2>
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<td class="memname"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint64_t</a> bit_manipulation::count_of_set_bits::countSetBits </td>
<td class="memname">std::uint64_t bit_manipulation::count_of_set_bits::countSetBits </td>
<td>(</td>
<td class="paramtype">std ::int64_t</td> <td class="paramname"><span class="paramname"><em>n</em></span></td><td>)</td>
<td></td>
@@ -172,6 +193,8 @@ Functions</h2></td></tr>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>total number of set-bits in the binary representation of number <code>n</code> </dd></dl>
<p class="definition">Definition at line <a class="el" href="../../da/db8/count__of__set__bits_8cpp_source.html#l00038">38</a> of file <a class="el" href="../../da/db8/count__of__set__bits_8cpp_source.html">count_of_set_bits.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 39</span> { <span class="comment">// int64_t is preferred over int so that</span></div>
<div class="line"><span class="lineno"> 40</span> <span class="comment">// no Overflow can be there.</span></div>
<div class="line"><span class="lineno"> 41</span> </div>
@@ -187,12 +210,7 @@ Functions</h2></td></tr>
<div class="line"><span class="lineno"> 51</span> <span class="comment">// set-bits in it. Means if my number is having &quot;3&quot; set bits, then this</span></div>
<div class="line"><span class="lineno"> 52</span> <span class="comment">// while loop will run only &quot;3&quot; times!!</span></div>
<div class="line"><span class="lineno"> 53</span>}</div>
</div><!-- fragment --><div class="dynheader">
Here is the call graph for this function:</div>
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<a id="ae66f6b31b5ad750f1fe042a706a4e3d4" name="ae66f6b31b5ad750f1fe042a706a4e3d4"></a>
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<p>Main function. </p>
<dl class="section return"><dt>Returns</dt><dd>0 on exit </dd></dl>
<p class="definition">Definition at line <a class="el" href="../../da/db8/count__of__set__bits_8cpp_source.html#l00080">80</a> of file <a class="el" href="../../da/db8/count__of__set__bits_8cpp_source.html">count_of_set_bits.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 80</span> {</div>
<div class="line"><span class="lineno"> 81</span> test(); <span class="comment">// run self-test implementations</span></div>
<div class="line"><span class="lineno"> 82</span> <span class="keywordflow">return</span> 0;</div>
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<p class="definition">Definition at line <a class="el" href="../../da/db8/count__of__set__bits_8cpp_source.html#l00057">57</a> of file <a class="el" href="../../da/db8/count__of__set__bits_8cpp_source.html">count_of_set_bits.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 57</span> {</div>
<div class="line"><span class="lineno"> 58</span> <span class="comment">// n = 4 return 1</span></div>
<div class="line"><span class="lineno"> 59</span> assert(bit_manipulation::count_of_set_bits::countSetBits(4) == 1);</div>
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<div class="line"><span class="lineno"> 71</span> assert(bit_manipulation::count_of_set_bits::countSetBits(97) == 3);</div>
<div class="line"><span class="lineno"> 72</span> <span class="comment">// n = 31 return 5</span></div>
<div class="line"><span class="lineno"> 73</span> assert(bit_manipulation::count_of_set_bits::countSetBits(31) == 5);</div>
<div class="line"><span class="lineno"> 74</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;All test cases successfully passed!&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 74</span> std::cout &lt;&lt; <span class="stringliteral">&quot;All test cases successfully passed!&quot;</span> &lt;&lt; std::endl;</div>
<div class="line"><span class="lineno"> 75</span>}</div>
<div class="ttc" id="abasic_ostream_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a></div></div>
<div class="ttc" id="aendl_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a></div><div class="ttdeci">T endl(T... args)</div></div>
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