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<div class="headertitle"><div class="title">count_bits_flip.cpp</div></div>
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<div class="contents">
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<a href="../../d7/d56/count__bits__flip_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span></div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="preprocessor">#include <cassert></span> </div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="preprocessor">#include <cstdint></span></div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="preprocessor">#include <iostream></span> </div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../d7/d81/namespacebit__manipulation.html">bit_manipulation</a> {</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../d4/d38/namespacecount__bits__flip.html">count_bits_flip</a> {</div>
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<div class="foldopen" id="foldopen00043" data-start="{" data-end="}">
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"><a class="line" href="../../d7/d56/count__bits__flip_8cpp.html#a2548486b6c3b80101e768562e687ef7b"> 43</a></span>std::uint64_t <a class="code hl_function" href="../../d7/d56/count__bits__flip_8cpp.html#a2548486b6c3b80101e768562e687ef7b">countBitsFlip</a>(</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> std::int64_t A,</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> std::int64_t B) { <span class="comment">// int64_t is preferred over int so that</span></div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="comment">// no Overflow can be there.</span></div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> </div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keywordtype">int</span> count =</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> 0; <span class="comment">// "count" variable is used to count number of bits flip of the</span></div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="comment">// number A to form B in binary representation of number 'n'</span></div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> A = A ^ B;</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="keywordflow">while</span> (A) {</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> A = A & (A - 1);</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> count++;</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> }</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> <span class="keywordflow">return</span> count;</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span>}</div>
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</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span>} <span class="comment">// namespace count_bits_flip</span></div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span>} <span class="comment">// namespace bit_manipulation</span></div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span></div>
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<div class="foldopen" id="foldopen00065" data-start="{" data-end="}">
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"><a class="line" href="../../d7/d56/count__bits__flip_8cpp.html#aa8dca7b867074164d5f45b0f3851269d"> 65</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../d7/d56/count__bits__flip_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>() {</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="comment">// A = 10, B = 20 return 4</span></div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> assert(<a class="code hl_function" href="../../d7/d56/count__bits__flip_8cpp.html#a2548486b6c3b80101e768562e687ef7b">bit_manipulation::count_bits_flip::countBitsFlip</a>(10, 20) == 4);</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="comment">// A = 20, B = 25 return 3</span></div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> assert(<a class="code hl_function" href="../../d7/d56/count__bits__flip_8cpp.html#a2548486b6c3b80101e768562e687ef7b">bit_manipulation::count_bits_flip::countBitsFlip</a>(20, 25) == 3);</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="comment">// A = 7, B = 10 return 3</span></div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> assert(<a class="code hl_function" href="../../d7/d56/count__bits__flip_8cpp.html#a2548486b6c3b80101e768562e687ef7b">bit_manipulation::count_bits_flip::countBitsFlip</a>(7, 10) == 3);</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="comment">// A = 17, B = 25 return 1</span></div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> assert(<a class="code hl_function" href="../../d7/d56/count__bits__flip_8cpp.html#a2548486b6c3b80101e768562e687ef7b">bit_manipulation::count_bits_flip::countBitsFlip</a>(17, 25) == 1);</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> <span class="comment">// A = 11, B = 8 return 2</span></div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> assert(<a class="code hl_function" href="../../d7/d56/count__bits__flip_8cpp.html#a2548486b6c3b80101e768562e687ef7b">bit_manipulation::count_bits_flip::countBitsFlip</a>(11, 8) == 2);</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// A = 21, B = 22 return 2</span></div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> assert(<a class="code hl_function" href="../../d7/d56/count__bits__flip_8cpp.html#a2548486b6c3b80101e768562e687ef7b">bit_manipulation::count_bits_flip::countBitsFlip</a>(21, 22) == 2);</div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="comment">// A = 7, B = 786 return 5</span></div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> assert(<a class="code hl_function" href="../../d7/d56/count__bits__flip_8cpp.html#a2548486b6c3b80101e768562e687ef7b">bit_manipulation::count_bits_flip::countBitsFlip</a>(7, 786) == 5);</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> std::cout << <span class="stringliteral">"All test cases successfully passed!"</span> << std::endl;</div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span>}</div>
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</div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span></div>
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<div class="foldopen" id="foldopen00086" data-start="{" data-end="}">
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"><a class="line" href="../../d7/d56/count__bits__flip_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 86</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d7/d56/count__bits__flip_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</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>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span>}</div>
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</div>
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<div class="ttc" id="acount__bits__flip_8cpp_html_a2548486b6c3b80101e768562e687ef7b"><div class="ttname"><a href="../../d7/d56/count__bits__flip_8cpp.html#a2548486b6c3b80101e768562e687ef7b">bit_manipulation::count_bits_flip::countBitsFlip</a></div><div class="ttdeci">std::uint64_t countBitsFlip(std::int64_t A, std::int64_t B)</div><div class="ttdoc">The main function implements count of bits flip required.</div><div class="ttdef"><b>Definition</b> <a href="#l00043">count_bits_flip.cpp:43</a></div></div>
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<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> <a href="#l00065">count_bits_flip.cpp:65</a></div></div>
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<div class="ttc" id="acount__bits__flip_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../d7/d56/count__bits__flip_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdoc">Main function.</div><div class="ttdef"><b>Definition</b> <a href="#l00086">count_bits_flip.cpp:86</a></div></div>
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<div class="ttc" id="anamespacebit__manipulation_html"><div class="ttname"><a href="../../d7/d81/namespacebit__manipulation.html">bit_manipulation</a></div><div class="ttdoc">for assert</div></div>
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<div class="ttc" id="anamespacecount__bits__flip_html"><div class="ttname"><a href="../../d4/d38/namespacecount__bits__flip.html">count_bits_flip</a></div><div class="ttdoc">Functions for the count bits flip implementation.</div></div>
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