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<div class="headertitle"><div class="title">check_factorial.cpp</div></div>
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<div class="contents">
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<a href="../../d8/dd5/check__factorial_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="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor">#include <cassert></span> </div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="preprocessor">#include <cstdint></span></div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="preprocessor">#include <iostream></span> </div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span></div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</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="foldopen00028" data-start="{" data-end="}">
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"><a class="line" href="../../dd/d47/namespacemath.html#a6c72f756a7bf1b9043c357e3fe7814ca"> 28</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="../../dd/d47/namespacemath.html#a6c72f756a7bf1b9043c357e3fe7814ca">is_factorial</a>(uint64_t n) {</div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> <span class="keywordflow">if</span> (n <= 0) { <span class="comment">// factorial numbers are only ever positive Integers</span></div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> }</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span></div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keywordtype">int</span> i = 2;</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> <span class="keywordflow">while</span> (n % i == 0) {</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> n = n / i;</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> i++;</div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> }</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span></div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keywordflow">return</span> (n == 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>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span>} <span class="comment">// namespace math</span></div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span></div>
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<div class="foldopen" id="foldopen00056" data-start="{" data-end="}">
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"><a class="line" href="../../d8/dd5/check__factorial_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e"> 56</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../d8/dd5/check__factorial_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a>() {</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a6c72f756a7bf1b9043c357e3fe7814ca">math::is_factorial</a>(50) == <span class="keyword">false</span>);</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a6c72f756a7bf1b9043c357e3fe7814ca">math::is_factorial</a>(720) == <span class="keyword">true</span>);</div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a6c72f756a7bf1b9043c357e3fe7814ca">math::is_factorial</a>(0) == <span class="keyword">false</span>);</div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a6c72f756a7bf1b9043c357e3fe7814ca">math::is_factorial</a>(1) == <span class="keyword">true</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#a6c72f756a7bf1b9043c357e3fe7814ca">math::is_factorial</a>(479001600) == <span class="keyword">true</span>);</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a6c72f756a7bf1b9043c357e3fe7814ca">math::is_factorial</a>(-24) == <span class="keyword">false</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">"All tests have successfully passed!"</span> << std::endl;</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span>}</div>
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</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span></div>
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<div class="foldopen" id="foldopen00071" data-start="{" data-end="}">
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"><a class="line" href="../../d8/dd5/check__factorial_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 71</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d8/dd5/check__factorial_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <a class="code hl_function" href="../../d8/dd5/check__factorial_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a>(); <span class="comment">// run self-test implementations</span></div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="keywordflow">return</span> 0;</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>
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<div class="ttc" id="acheck__factorial_8cpp_html_a483bb8ccf42aaf7375a83e91490eda1e"><div class="ttname"><a href="../../d8/dd5/check__factorial_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a></div><div class="ttdeci">static void tests()</div><div class="ttdoc">Self-test implementations.</div><div class="ttdef"><b>Definition</b> <a href="#l00056">check_factorial.cpp:56</a></div></div>
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<div class="ttc" id="acheck__factorial_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../d8/dd5/check__factorial_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="#l00071">check_factorial.cpp:71</a></div></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_a6c72f756a7bf1b9043c357e3fe7814ca"><div class="ttname"><a href="../../dd/d47/namespacemath.html#a6c72f756a7bf1b9043c357e3fe7814ca">math::is_factorial</a></div><div class="ttdeci">bool is_factorial(uint64_t n)</div><div class="ttdoc">Function to check if the given number is factorial of some number or not.</div><div class="ttdef"><b>Definition</b> <a href="#l00028">check_factorial.cpp:28</a></div></div>
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