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<div class="headertitle"><div class="title">power_of_two.cpp</div></div>
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<a href="../../d4/d38/power__of__two_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="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="preprocessor">#include <iostream></span> </div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="preprocessor">#include <cassert></span> </div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> </div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../dd/d47/namespacemath.html">math</a> {</div>
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<div class="foldopen" id="foldopen00042" data-start="{" data-end="}">
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"><a class="line" href="../../dd/d47/namespacemath.html#a8a48be4d7f14e34c5c92925bc1cbf3bb"> 42</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../dd/d47/namespacemath.html#a8a48be4d7f14e34c5c92925bc1cbf3bb">power_of_two</a>(<span class="keywordtype">int</span> n) {</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="keywordtype">int</span> result = n & (n - 1);</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="keywordflow">if</span> (result == 0) {</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keywordflow">return</span> 1;</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> }</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> </div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span>}</div>
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</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span>} <span class="comment">// namespace math</span></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="foldopen" id="foldopen00059" data-start="{" data-end="}">
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"><a class="line" href="../../d4/d38/power__of__two_8cpp.html#aa8dca7b867074164d5f45b0f3851269d"> 59</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../d4/d38/power__of__two_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>() {</div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> std::cout << <span class="stringliteral">"First case testing... \n"</span>; <span class="comment">// for n = 32 return 1</span></div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a8a48be4d7f14e34c5c92925bc1cbf3bb">math::power_of_two</a>(32) == 1);</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> std::cout << <span class="stringliteral">"\nPassed!\n"</span>;</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> </div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> std::cout << <span class="stringliteral">"Second case testing... \n"</span>; <span class="comment">// for n = 5 return 0</span></div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a8a48be4d7f14e34c5c92925bc1cbf3bb">math::power_of_two</a>(5) == 0);</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> std::cout << <span class="stringliteral">"\nPassed!\n"</span>;</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> </div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> std::cout << <span class="stringliteral">"Third case testing... \n"</span>; <span class="comment">// for n = 232 return 0</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="../../dd/d47/namespacemath.html#a8a48be4d7f14e34c5c92925bc1cbf3bb">math::power_of_two</a>(232) == 0);</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> std::cout << <span class="stringliteral">"\nPassed!\n"</span>;</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> </div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> std::cout << <span class="stringliteral">"\nAll test cases have successfully passed!\n"</span>;</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span>}</div>
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</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> </div>
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<div class="foldopen" id="foldopen00079" data-start="{" data-end="}">
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"><a class="line" href="../../d4/d38/power__of__two_8cpp.html#adfd6be45be425ae28c62ce3bfb4b40dc"> 79</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="../../d4/d38/power__of__two_8cpp.html#adfd6be45be425ae28c62ce3bfb4b40dc">user_input_test</a>() {</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="keywordtype">int</span> n = 0; <span class="comment">// input from user</span></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 class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> std::cout << <span class="stringliteral">"Enter a number "</span> << std::endl;</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> std::cin >> n; </div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> </div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> <span class="keywordtype">int</span> result = <a class="code hl_function" href="../../dd/d47/namespacemath.html#a8a48be4d7f14e34c5c92925bc1cbf3bb">math::power_of_two</a>(n);</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="keywordflow">if</span> (result == 1) {</div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> std::cout << <span class="stringliteral">"Yes, the number "</span> << n << <span class="stringliteral">" is a power of 2\n"</span>;</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 class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> <span class="keywordflow">else</span> { </div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> std::cout << <span class="stringliteral">"No, the number "</span> << n << <span class="stringliteral">" is not a power of 2\n"</span>;</div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> }</div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span>}</div>
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</div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> </div>
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<div class="foldopen" id="foldopen00099" data-start="{" data-end="}">
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"><a class="line" href="../../d4/d38/power__of__two_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 99</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d4/d38/power__of__two_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
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<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> <a class="code hl_function" href="../../d4/d38/power__of__two_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// run self-test implementations</span></div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> </div>
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> <span class="comment">// uncomment the line below to take user inputs</span></div>
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<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> <span class="comment">//user_input_test();</span></div>
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<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> </div>
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<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span>}</div>
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</div>
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<div class="ttc" id="anamespacemath_html"><div class="ttname"><a href="../../dd/d47/namespacemath.html">math</a></div><div class="ttdoc">for assert</div></div>
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<div class="ttc" id="anamespacemath_html_a8a48be4d7f14e34c5c92925bc1cbf3bb"><div class="ttname"><a href="../../dd/d47/namespacemath.html#a8a48be4d7f14e34c5c92925bc1cbf3bb">math::power_of_two</a></div><div class="ttdeci">int power_of_two(int n)</div><div class="ttdoc">This function finds whether a number is power of 2 or not.</div><div class="ttdef"><b>Definition</b> <a href="#l00042">power_of_two.cpp:42</a></div></div>
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<div class="ttc" id="apower__of__two_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../d4/d38/power__of__two_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="#l00059">power_of_two.cpp:59</a></div></div>
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<div class="ttc" id="apower__of__two_8cpp_html_adfd6be45be425ae28c62ce3bfb4b40dc"><div class="ttname"><a href="../../d4/d38/power__of__two_8cpp.html#adfd6be45be425ae28c62ce3bfb4b40dc">user_input_test</a></div><div class="ttdeci">void user_input_test()</div><div class="ttdoc">Take user input in the test cases (optional; currently commented)</div><div class="ttdef"><b>Definition</b> <a href="#l00079">power_of_two.cpp:79</a></div></div>
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<div class="ttc" id="apower__of__two_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../d4/d38/power__of__two_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="#l00099">power_of_two.cpp:99</a></div></div>
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