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<p>Implementation to [Count number of bits to be flipped to convert A to B] (<a href="https://www.geeksforgeeks.org/count-number-of-bits-to-be-flipped-to-convert-a-to-b/">https://www.geeksforgeeks.org/count-number-of-bits-to-be-flipped-to-convert-a-to-b/</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 />
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Include dependency graph for count_bits_flip.cpp:</div>
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Namespaces</h2></td></tr>
<tr class="memitem:d7/d81/namespacebit__manipulation"><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>
<tr class="memdesc:d7/d81/namespacebit__manipulation"><td class="mdescLeft">&#160;</td><td class="mdescRight">for IO operations <br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:d4/d38/namespacecount__bits__flip"><td class="memItemLeft" align="right" valign="top">namespace &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d4/d38/namespacecount__bits__flip.html">count_bits_flip</a></td></tr>
<tr class="memdesc:d4/d38/namespacecount__bits__flip"><td class="mdescLeft">&#160;</td><td class="mdescRight">Functions for the <a href="https://www.geeksforgeeks.org/count-set-bits-in-an-integer/" target="_blank">count bits flip</a> implementation. <br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a2548486b6c3b80101e768562e687ef7b"><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="../../d7/d56/count__bits__flip_8cpp.html#a2548486b6c3b80101e768562e687ef7b">bit_manipulation::count_bits_flip::countBitsFlip</a> (<a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/types/integer.html">std::int64_t</a> A, <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/types/integer.html">std::int64_t</a> B)</td></tr>
<tr class="memdesc:a2548486b6c3b80101e768562e687ef7b"><td class="mdescLeft">&#160;</td><td class="mdescRight">The main function implements count of bits flip required. <br /></td></tr>
<tr class="separator:a2548486b6c3b80101e768562e687ef7b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa8dca7b867074164d5f45b0f3851269d"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d56/count__bits__flip_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a> ()</td></tr>
<tr class="memdesc:aa8dca7b867074164d5f45b0f3851269d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Self-test implementations. <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="../../d7/d56/count__bits__flip_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Main function. <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 [Count number of bits to be flipped to convert A to B] (<a href="https://www.geeksforgeeks.org/count-number-of-bits-to-be-flipped-to-convert-a-to-b/">https://www.geeksforgeeks.org/count-number-of-bits-to-be-flipped-to-convert-a-to-b/</a>) in an integer. </p>
<p>We are given two numbers A and B. Our task is to count the number of bits needed to be flipped to convert A to B.</p>
<p>Explanation:</p>
<p>A = 01010 B = 10100 As we can see, the bits of A that need to be flipped are 01010. If we flipthese bits, we get 10100, which is B.</p>
<p>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/yashrajyash" target="_blank">Yash Raj Singh</a> </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a2548486b6c3b80101e768562e687ef7b">&#9670;&#160;</a></span>countBitsFlip()</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_bits_flip::countBitsFlip </td>
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<p>The main function implements count of bits flip required. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">A</td><td>is the given number whose bits will be flipped to get number B </td></tr>
<tr><td class="paramname">B</td><td>is the given target number </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>total number of bits needed to be flipped to convert A to B </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 44</span> { <span class="comment">// int64_t is preferred over int so that</span></div>
<div class="line"><span class="lineno"> 45</span> <span class="comment">// no Overflow can be there.</span></div>
<div class="line"><span class="lineno"> 46</span> </div>
<div class="line"><span class="lineno"> 47</span> <span class="keywordtype">int</span> count =</div>
<div class="line"><span class="lineno"> 48</span> 0; <span class="comment">// &quot;count&quot; variable is used to count number of bits flip of the</span></div>
<div class="line"><span class="lineno"> 49</span> <span class="comment">// number A to form B in binary representation of number &#39;n&#39;</span></div>
<div class="line"><span class="lineno"> 50</span> A = A ^ B;</div>
<div class="line"><span class="lineno"> 51</span> <span class="keywordflow">while</span> (A) {</div>
<div class="line"><span class="lineno"> 52</span> A = A &amp; (A - 1);</div>
<div class="line"><span class="lineno"> 53</span> count++;</div>
<div class="line"><span class="lineno"> 54</span> }</div>
<div class="line"><span class="lineno"> 55</span> <span class="keywordflow">return</span> count;</div>
<div class="line"><span class="lineno"> 56</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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<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"> 85</span> {</div>
<div class="line"><span class="lineno"> 86</span> <a class="code hl_function" href="../../d7/d56/count__bits__flip_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// run self-test implementations</span></div>
<div class="line"><span class="lineno"> 87</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 88</span>}</div>
<div class="ttc" id="acount__bits__flip_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../d7/d56/count__bits__flip_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_bits_flip.cpp:64</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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<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"> 64</span> {</div>
<div class="line"><span class="lineno"> 65</span> <span class="comment">// A = 10, B = 20 return 4</span></div>
<div class="line"><span class="lineno"> 66</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(10, 20) == 4);</div>
<div class="line"><span class="lineno"> 67</span> <span class="comment">// A = 20, B = 25 return 3</span></div>
<div class="line"><span class="lineno"> 68</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(20, 25) == 3);</div>
<div class="line"><span class="lineno"> 69</span> <span class="comment">// A = 7, B = 10 return 3</span></div>
<div class="line"><span class="lineno"> 70</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(7, 10) == 3);</div>
<div class="line"><span class="lineno"> 71</span> <span class="comment">// A = 17, B = 25 return 1</span></div>
<div class="line"><span class="lineno"> 72</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(17, 25) == 1);</div>
<div class="line"><span class="lineno"> 73</span> <span class="comment">// A = 11, B = 8 return 2</span></div>
<div class="line"><span class="lineno"> 74</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(11, 8) == 2);</div>
<div class="line"><span class="lineno"> 75</span> <span class="comment">// A = 21, B = 22 return 2</span></div>
<div class="line"><span class="lineno"> 76</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(21, 22) == 2);</div>
<div class="line"><span class="lineno"> 77</span> <span class="comment">// A = 7, B = 786 return 5</span></div>
<div class="line"><span class="lineno"> 78</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(7, 786) == 5);</div>
<div class="line"><span class="lineno"> 79</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"> 80</span>}</div>
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