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<title>Algorithms_in_C++: bit_manipulation/count_bits_flip.cpp File Reference</title>
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<div id="projectname">Algorithms_in_C++<span id="projectnumber"> 1.0.0</span>
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<div id="projectbrief">Set of algorithms implemented in C++.</div>
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@@ -97,7 +97,7 @@ $(document).ready(function(){initNavTree('d7/d56/count__bits__flip_8cpp.html','.
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<p>Implementation to <a href="https://www.geeksforgeeks.org/count-number-of-bits-to-be-flipped-to-convert-a-to-b/" target="_blank">Count number of bits to be flipped to convert A to B</a> in an integer.
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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.
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<a href="#details">More...</a></p>
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<div class="textblock"><code>#include <cassert></code><br />
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<code>#include <iostream></code><br />
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@@ -130,7 +130,7 @@ Functions</h2></td></tr>
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<tr class="separator:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p >Implementation to <a href="https://www.geeksforgeeks.org/count-number-of-bits-to-be-flipped-to-convert-a-to-b/" target="_blank">Count number of bits to be flipped to convert A to B</a> in an integer. </p>
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<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>
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<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>
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<p >Explanation:</p>
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<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>
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@@ -171,19 +171,19 @@ Functions</h2></td></tr>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>total number of bits needed to be flipped to convert A to B </dd></dl>
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<div class="fragment"><div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> { <span class="comment">// int64_t is preferred over int so that</span></div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="comment">// no Overflow can be there.</span></div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> </div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="keywordtype">int</span> count =</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</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="l00049" name="l00049"></a><span class="lineno"> 49</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="l00050" name="l00050"></a><span class="lineno"> 50</span> A = A ^ B;</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="keywordflow">while</span> (A) {</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> A = A & (A - 1);</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> count++;</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> }</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keywordflow">return</span> count;</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span>}</div>
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<div class="fragment"><div class="line"><span class="lineno"> 44</span> { <span class="comment">// int64_t is preferred over int so that</span></div>
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<div class="line"><span class="lineno"> 45</span> <span class="comment">// no Overflow can be there.</span></div>
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<div class="line"><span class="lineno"> 46</span> </div>
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<div class="line"><span class="lineno"> 47</span> <span class="keywordtype">int</span> count =</div>
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<div class="line"><span class="lineno"> 48</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"><span class="lineno"> 49</span> <span class="comment">// number A to form B in binary representation of number 'n'</span></div>
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<div class="line"><span class="lineno"> 50</span> A = A ^ B;</div>
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<div class="line"><span class="lineno"> 51</span> <span class="keywordflow">while</span> (A) {</div>
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<div class="line"><span class="lineno"> 52</span> A = A & (A - 1);</div>
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<div class="line"><span class="lineno"> 53</span> count++;</div>
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<div class="line"><span class="lineno"> 54</span> }</div>
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<div class="line"><span class="lineno"> 55</span> <span class="keywordflow">return</span> count;</div>
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<div class="line"><span class="lineno"> 56</span>}</div>
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</div><!-- fragment --><div class="dynheader">
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Here is the call graph for this function:</div>
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@@ -211,10 +211,10 @@ Here is the call graph for this function:</div>
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<p>Main function. </p>
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<dl class="section return"><dt>Returns</dt><dd>0 on exit </dd></dl>
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<div class="fragment"><div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> {</div>
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<div class="line"><a id="l00086" name="l00086"></a><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>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span>}</div>
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<div class="fragment"><div class="line"><span class="lineno"> 85</span> {</div>
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<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>
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<div class="line"><span class="lineno"> 87</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><span class="lineno"> 88</span>}</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> count_bits_flip.cpp:64</div></div>
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Here is the call graph for this function:</div>
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<p>Self-test implementations. </p>
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<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
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<div class="fragment"><div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> {</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// A = 10, B = 20 return 4</span></div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(10, 20) == 4);</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="comment">// A = 20, B = 25 return 3</span></div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(20, 25) == 3);</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="comment">// A = 7, B = 10 return 3</span></div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(7, 10) == 3);</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="comment">// A = 17, B = 25 return 1</span></div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(17, 25) == 1);</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// A = 11, B = 8 return 2</span></div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(11, 8) == 2);</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="comment">// A = 21, B = 22 return 2</span></div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(21, 22) == 2);</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// A = 7, B = 786 return 5</span></div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(7, 786) == 5);</div>
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<div class="line"><a id="l00079" name="l00079"></a><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> << <span class="stringliteral">"All test cases successfully passed!"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span>}</div>
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<div class="fragment"><div class="line"><span class="lineno"> 64</span> {</div>
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<div class="line"><span class="lineno"> 65</span> <span class="comment">// A = 10, B = 20 return 4</span></div>
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<div class="line"><span class="lineno"> 66</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(10, 20) == 4);</div>
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<div class="line"><span class="lineno"> 67</span> <span class="comment">// A = 20, B = 25 return 3</span></div>
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<div class="line"><span class="lineno"> 68</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(20, 25) == 3);</div>
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<div class="line"><span class="lineno"> 69</span> <span class="comment">// A = 7, B = 10 return 3</span></div>
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<div class="line"><span class="lineno"> 70</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(7, 10) == 3);</div>
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<div class="line"><span class="lineno"> 71</span> <span class="comment">// A = 17, B = 25 return 1</span></div>
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<div class="line"><span class="lineno"> 72</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(17, 25) == 1);</div>
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<div class="line"><span class="lineno"> 73</span> <span class="comment">// A = 11, B = 8 return 2</span></div>
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<div class="line"><span class="lineno"> 74</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(11, 8) == 2);</div>
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<div class="line"><span class="lineno"> 75</span> <span class="comment">// A = 21, B = 22 return 2</span></div>
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<div class="line"><span class="lineno"> 76</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(21, 22) == 2);</div>
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<div class="line"><span class="lineno"> 77</span> <span class="comment">// A = 7, B = 786 return 5</span></div>
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<div class="line"><span class="lineno"> 78</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(7, 786) == 5);</div>
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<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> << <span class="stringliteral">"All test cases successfully passed!"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 80</span>}</div>
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<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>
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<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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</div><!-- fragment --><div class="dynheader">
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@@ -284,7 +284,7 @@ Here is the call graph for this function:</div>
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<ul>
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<li class="navelem"><a class="el" href="../../dir_f3c4fbc4e901afa0a54d0623c5574aa7.html">bit_manipulation</a></li><li class="navelem"><a class="el" href="../../d7/d56/count__bits__flip_8cpp.html">count_bits_flip.cpp</a></li>
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<li class="footer">Generated by <a href="https://www.doxygen.org/index.html"><img class="footer" src="../../doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.9.2 </li>
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