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<div class="title">count_of_set_bits.cpp File Reference</div> </div>
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<p>Implementation to <a href="https://www.geeksforgeeks.org/count-set-bits-in-an-integer/">count sets bits</a> in an integer.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;cassert&gt;</code><br />
<code>#include &lt;iostream&gt;</code><br />
<code>#include &lt;vector&gt;</code><br />
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Include dependency graph for count_of_set_bits.cpp:</div>
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Namespaces</h2></td></tr>
<tr class="memitem:d7/d81/namespacebit__manipulation"><td class="memItemLeft" align="right" valign="top"> &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d81/namespacebit__manipulation.html">bit_manipulation</a></td></tr>
<tr class="memdesc:d7/d81/namespacebit__manipulation"><td class="mdescLeft">&#160;</td><td class="mdescRight">for <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a> <br /></td></tr>
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<tr class="memdesc:dd/dae/namespacecount__of__set__bits"><td class="mdescLeft">&#160;</td><td class="mdescRight">Functions for the <a href="https://www.geeksforgeeks.org/count-set-bits-in-an-integer/">count sets bits</a> implementation. <br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a1f6a583b73a3e85c2d5121ed3d1c7d8a"><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="../../da/db8/count__of__set__bits_8cpp.html#a1f6a583b73a3e85c2d5121ed3d1c7d8a">bit_manipulation::count_of_set_bits::countSetBits</a> (int n)</td></tr>
<tr class="memdesc:a1f6a583b73a3e85c2d5121ed3d1c7d8a"><td class="mdescLeft">&#160;</td><td class="mdescRight">The main function implements set bit count. <a href="../../da/db8/count__of__set__bits_8cpp.html#a1f6a583b73a3e85c2d5121ed3d1c7d8a">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/db8/count__of__set__bits_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a> ()</td></tr>
<tr class="memdesc:aa8dca7b867074164d5f45b0f3851269d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Self-test implementations. <a href="../../da/db8/count__of__set__bits_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">More...</a><br /></td></tr>
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<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../da/db8/count__of__set__bits_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Main function. <a href="../../da/db8/count__of__set__bits_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Implementation to <a href="https://www.geeksforgeeks.org/count-set-bits-in-an-integer/">count sets bits</a> in an integer. </p>
<p>We are given an integer number. Let’s say, number. The task is to first calculate the binary digit of a number and then calculate the total set bits of a number.</p>
<p>Set bits in a binary number is represented by 1. Whenever we calculate the binary number of an integer value it is formed as the combination of 0’s and 1’s. So digit 1 is known as a set bit in computer terms. Time Complexity: O(log n) Space complexity: O(1) </p><dl class="section author"><dt>Author</dt><dd><a href="https://github.com/Swastyy">Swastika Gupta</a> </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="a1f6a583b73a3e85c2d5121ed3d1c7d8a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a1f6a583b73a3e85c2d5121ed3d1c7d8a">&#9670;&nbsp;</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>
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<p>The main function implements set bit count. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">n</td><td>is the number whose set bit will be counted </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>the count of the number set bit in the binary representation of <code>n</code> </dd></dl>
<div class="fragment"><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; {</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; <span class="keywordtype">int</span> count = 0; <span class="comment">// &quot;count&quot; variable is used to count number of 1&#39;s in binary</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; <span class="comment">// representation of the number</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <span class="keywordflow">while</span> (n != 0) {</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; count += n &amp; 1;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; n = n &gt;&gt; 1; <span class="comment">// n=n/2</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; }</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; <span class="keywordflow">return</span> count;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&nbsp;</a></span>main()</h2>
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<td class="memname">int main </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"><a name="l00077"></a><span class="lineno"> 77</span>&#160; {</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <a class="code" href="../../da/db8/count__of__set__bits_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// run self-test implementations</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160;}</div>
<div class="ttc" id="acount__of__set__bits_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../da/db8/count__of__set__bits_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">Self-test implementations.</div><div class="ttdef"><b>Definition:</b> count_of_set_bits.cpp:57</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#aa8dca7b867074164d5f45b0f3851269d">&#9670;&nbsp;</a></span>test()</h2>
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<td class="memname">static void test </td>
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<p>Self-test implementations. </p>
<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
<div class="fragment"><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; {</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="comment">// n = 4 return 1</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; assert(bit_manipulation::count_of_set_bits::countSetBits(4) == 1);</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="comment">// n = 6 return 2</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; assert(bit_manipulation::count_of_set_bits::countSetBits(6) == 2);</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; <span class="comment">// n = 13 return 3</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; assert(bit_manipulation::count_of_set_bits::countSetBits(13) == 3);</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; <span class="comment">// n = 9 return 2</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; assert(bit_manipulation::count_of_set_bits::countSetBits(9) == 2);</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <span class="comment">// n = 15 return 4</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; assert(bit_manipulation::count_of_set_bits::countSetBits(15) == 4);</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="comment">// n = 25 return 3</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; assert(bit_manipulation::count_of_set_bits::countSetBits(25) == 3);</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</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;All test cases successfully passed!&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="l00071"></a><span class="lineno"> 71</span>&#160;}</div>
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