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<div class="headertitle"><div class="title">iterative_factorial.cpp</div></div>
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<div class="contents">
<a href="../../db/d9f/iterative__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>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="preprocessor">#include &lt;cassert&gt;</span> </div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="preprocessor">#include &lt;cstdint&gt;</span> </div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="preprocessor">#include &lt;exception&gt;</span> </div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="preprocessor">#include &lt;iostream&gt;</span> </div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../dd/d47/namespacemath.html">math</a> {</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span></div>
<div class="foldopen" id="foldopen00047" data-start="{" data-end="}">
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"><a class="line" href="../../dd/d47/namespacemath.html#a2565c745aac2f9561cc6fd9e56d9b77a"> 47</a></span>uint64_t <a class="code hl_function" href="../../dd/d47/namespacemath.html#a2565c745aac2f9561cc6fd9e56d9b77a">iterativeFactorial</a>(uint8_t n) {</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keywordflow">if</span> (n &gt; 20) {</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keywordflow">throw</span> std::invalid_argument(<span class="stringliteral">&quot;Maximum n value is 20&quot;</span>);</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> }</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> </div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="comment">// 1 because it is the identity number of multiplication.</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> uint64_t accumulator = 1;</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> </div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keywordflow">while</span> (n &gt; 1) {</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> accumulator *= n;</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> --n;</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> }</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> </div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keywordflow">return</span> accumulator;</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span>}</div>
</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> </div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span>} <span class="comment">// namespace math</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span></div>
<div class="foldopen" id="foldopen00069" data-start="{" data-end="}">
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"><a class="line" href="../../db/d9f/iterative__factorial_8cpp.html#aa8dca7b867074164d5f45b0f3851269d"> 69</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../db/d9f/iterative__factorial_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>() {</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="comment">// Special case test</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> std::cout &lt;&lt; <span class="stringliteral">&quot;Exception case test \n&quot;</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="stringliteral">&quot;Input: 0 \n&quot;</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="stringliteral">&quot;Expected output: 1 \n\n&quot;</span>;</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a2565c745aac2f9561cc6fd9e56d9b77a">math::iterativeFactorial</a>(0) == 1);</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> </div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// Base case</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> std::cout &lt;&lt; <span class="stringliteral">&quot;Base case test \n&quot;</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="stringliteral">&quot;Input: 1 \n&quot;</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="stringliteral">&quot;Expected output: 1 \n\n&quot;</span>;</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a2565c745aac2f9561cc6fd9e56d9b77a">math::iterativeFactorial</a>(1) == 1);</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> </div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="comment">// Small case</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> std::cout &lt;&lt; <span class="stringliteral">&quot;Small number case test \n&quot;</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="stringliteral">&quot;Input: 5 \n&quot;</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> <span class="stringliteral">&quot;Expected output: 120 \n\n&quot;</span>;</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a2565c745aac2f9561cc6fd9e56d9b77a">math::iterativeFactorial</a>(5) == 120);</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> </div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> <span class="comment">// Medium case</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> std::cout &lt;&lt; <span class="stringliteral">&quot;Medium number case test \n&quot;</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> <span class="stringliteral">&quot;Input: 10 \n&quot;</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="stringliteral">&quot;Expected output: 3628800 \n\n&quot;</span>;</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a2565c745aac2f9561cc6fd9e56d9b77a">math::iterativeFactorial</a>(10) == 3628800);</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> </div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> <span class="comment">// Maximum case</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> std::cout &lt;&lt; <span class="stringliteral">&quot;Maximum case test \n&quot;</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> <span class="stringliteral">&quot;Input: 20 \n&quot;</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> <span class="stringliteral">&quot;Expected output: 2432902008176640000\n\n&quot;</span>;</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> assert(<a class="code hl_function" href="../../dd/d47/namespacemath.html#a2565c745aac2f9561cc6fd9e56d9b77a">math::iterativeFactorial</a>(20) == 2432902008176640000);</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> </div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> <span class="comment">// Exception test</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> std::cout &lt;&lt; <span class="stringliteral">&quot;Exception test \n&quot;</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> <span class="stringliteral">&quot;Input: 21 \n&quot;</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> <span class="stringliteral">&quot;Expected output: Exception thrown \n&quot;</span>;</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> </div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> <span class="keywordtype">bool</span> wasExceptionThrown = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> <span class="keywordflow">try</span> {</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> <a class="code hl_function" href="../../dd/d47/namespacemath.html#a2565c745aac2f9561cc6fd9e56d9b77a">math::iterativeFactorial</a>(21);</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> } <span class="keywordflow">catch</span> (<span class="keyword">const</span> std::invalid_argument&amp;) {</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> wasExceptionThrown = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> }</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> assert(wasExceptionThrown);</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> </div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> std::cout &lt;&lt; <span class="stringliteral">&quot;All tests have passed successfully.\n&quot;</span>;</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span>}</div>
</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span></div>
<div class="foldopen" id="foldopen00120" data-start="{" data-end="}">
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"><a class="line" href="../../db/d9f/iterative__factorial_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 120</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../db/d9f/iterative__factorial_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> <a class="code hl_function" href="../../db/d9f/iterative__factorial_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// Run self-test implementation</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span>}</div>
</div>
<div class="ttc" id="aiterative__factorial_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../db/d9f/iterative__factorial_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">Self-test implementations to test iterativeFactorial function.</div><div class="ttdef"><b>Definition</b> <a href="#l00069">iterative_factorial.cpp:69</a></div></div>
<div class="ttc" id="aiterative__factorial_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../db/d9f/iterative__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="#l00120">iterative_factorial.cpp:120</a></div></div>
<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>
<div class="ttc" id="anamespacemath_html_a2565c745aac2f9561cc6fd9e56d9b77a"><div class="ttname"><a href="../../dd/d47/namespacemath.html#a2565c745aac2f9561cc6fd9e56d9b77a">math::iterativeFactorial</a></div><div class="ttdeci">uint64_t iterativeFactorial(uint8_t n)</div><div class="ttdoc">Calculates the factorial iteratively.</div><div class="ttdef"><b>Definition</b> <a href="#l00047">iterative_factorial.cpp:47</a></div></div>
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