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<div class="headertitle"><div class="title">factorial.cpp</div></div>
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<a href="../../d9/d00/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="l00013" name="l00013"></a><span class="lineno"> 13</span> </div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="preprocessor">#include <cassert></span> </div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="preprocessor">#include <cstdint></span></div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="preprocessor">#include <iostream></span> </div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</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="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span></div>
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<div class="foldopen" id="foldopen00029" data-start="{" data-end="}">
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"><a class="line" href="../../dd/d47/namespacemath.html#a7e78996673df791014cfe540b183456a"> 29</a></span>uint64_t <a class="code hl_function" href="../../dd/d47/namespacemath.html#a7e78996673df791014cfe540b183456a">factorial</a>(uint8_t n) {</div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="keywordflow">if</span> (n > 20) {</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> <span class="keywordflow">throw</span> std::invalid_argument(<span class="stringliteral">"maximum value is 20\n"</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="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="keywordflow">if</span> (n == 0) {</div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> <span class="keywordflow">return</span> 1;</div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> }</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> <span class="keywordflow">return</span> n * <a class="code hl_function" href="../../dd/d47/namespacemath.html#a7e78996673df791014cfe540b183456a">factorial</a>(n - 1);</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span>}</div>
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</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span>} <span class="comment">// namespace math</span></div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span></div>
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<div class="foldopen" id="foldopen00044" data-start="{" data-end="}">
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"><a class="line" href="../../d9/d00/factorial_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e"> 44</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../d9/d00/factorial_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a>() {</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a7e78996673df791014cfe540b183456a">math::factorial</a>(1) == 1);</div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a7e78996673df791014cfe540b183456a">math::factorial</a>(0) == 1);</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a7e78996673df791014cfe540b183456a">math::factorial</a>(5) == 120);</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a7e78996673df791014cfe540b183456a">math::factorial</a>(10) == 3628800);</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a7e78996673df791014cfe540b183456a">math::factorial</a>(20) == 2432902008176640000);</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> std::cout << <span class="stringliteral">"All tests have passed successfully!\n"</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>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span></div>
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<div class="foldopen" id="foldopen00057" data-start="{" data-end="}">
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"><a class="line" href="../../d9/d00/factorial_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 57</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d9/d00/factorial_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> <a class="code hl_function" href="../../d9/d00/factorial_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a>(); <span class="comment">// run self-test implementations</span></div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="keywordflow">return</span> 0;</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>
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<div class="ttc" id="afactorial_8cpp_html_a483bb8ccf42aaf7375a83e91490eda1e"><div class="ttname"><a href="../../d9/d00/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="#l00044">factorial.cpp:44</a></div></div>
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<div class="ttc" id="afactorial_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../d9/d00/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="#l00057">factorial.cpp:57</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_a7e78996673df791014cfe540b183456a"><div class="ttname"><a href="../../dd/d47/namespacemath.html#a7e78996673df791014cfe540b183456a">math::factorial</a></div><div class="ttdeci">uint64_t factorial(uint8_t n)</div><div class="ttdoc">function to find factorial of given number</div><div class="ttdef"><b>Definition</b> <a href="#l00029">factorial.cpp:29</a></div></div>
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