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<p>Program to check if a number is an <a href="https://en.wikipedia.org/wiki/Narcissistic_number">Armstrong/Narcissistic number</a> in decimal system.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;cassert&gt;</code><br />
<code>#include &lt;cmath&gt;</code><br />
<code>#include &lt;iostream&gt;</code><br />
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Include dependency graph for armstrong_number.cpp:</div>
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Functions</h2></td></tr>
<tr class="memitem:aab733299b170fa5a752503f95f090fcd"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d4/d5d/math_2armstrong__number_8cpp.html#aab733299b170fa5a752503f95f090fcd">number_of_digits</a> (int num)</td></tr>
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<tr class="memitem:a9cebd92bc70890c3cfa261d68a5016e7"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d4/d5d/math_2armstrong__number_8cpp.html#a9cebd92bc70890c3cfa261d68a5016e7">is_armstrong</a> (int number)</td></tr>
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<tr class="memitem:ae1a3968e7947464bee7714f6d43b7002"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d4/d5d/math_2armstrong__number_8cpp.html#ae1a3968e7947464bee7714f6d43b7002">test</a> ()</td></tr>
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<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d4/d5d/math_2armstrong__number_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Program to check if a number is an <a href="https://en.wikipedia.org/wiki/Narcissistic_number">Armstrong/Narcissistic number</a> in decimal system. </p>
<p>Armstrong number or <a href="https://en.wikipedia.org/wiki/Narcissistic_number">Narcissistic number</a> is a number that is the sum of its own digits raised to the power of the number of digits. </p><dl class="section author"><dt>Author</dt><dd>iamnambiar </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a9cebd92bc70890c3cfa261d68a5016e7">&#9670;&nbsp;</a></span>is_armstrong()</h2>
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<td class="memname">bool is_armstrong </td>
<td>(</td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>number</em></td><td>)</td>
<td></td>
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<p>Function to check whether the number is armstrong number or not. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">num</td><td>Number </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>true</code> if the number is armstrong. </dd>
<dd>
<code>false</code> if the number is not armstrong. </dd></dl>
<div class="fragment"><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; {</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; <span class="comment">// If the number is less than 0, then it is not a armstrong number.</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; <span class="keywordflow">if</span> (number &lt; 0) {</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; }</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; <span class="keywordtype">int</span> <a class="code" href="../../d8/d77/namespacemachine__learning.html#a5305cc18d11943d3dc0d66e70d7e9c44">sum</a> = 0;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; <span class="keywordtype">int</span> temp = number;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; <span class="comment">// Finding the total number of digits in the number</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <span class="keywordtype">int</span> total_digits = <a class="code" href="../../d4/d5d/math_2armstrong__number_8cpp.html#aab733299b170fa5a752503f95f090fcd">number_of_digits</a>(number);</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; <span class="keywordflow">while</span> (temp &gt; 0) {</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; <span class="keywordtype">int</span> rem = temp % 10;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; <span class="comment">// Finding each digit raised to the power total digit and add it to the</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; <span class="comment">// total sum</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <a class="code" href="../../d8/d77/namespacemachine__learning.html#a5305cc18d11943d3dc0d66e70d7e9c44">sum</a> = <a class="code" href="../../d8/d77/namespacemachine__learning.html#a5305cc18d11943d3dc0d66e70d7e9c44">sum</a> + <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/numeric/math/pow.html">std::pow</a>(rem, total_digits);</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; temp = temp / 10;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; }</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="keywordflow">return</span> number == <a class="code" href="../../d8/d77/namespacemachine__learning.html#a5305cc18d11943d3dc0d66e70d7e9c44">sum</a>;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160;}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&nbsp;</a></span>main()</h2>
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<p>Main Function </p>
<div class="fragment"><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; {</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <a class="code" href="../../d4/d5d/math_2armstrong__number_8cpp.html#ae1a3968e7947464bee7714f6d43b7002">test</a>();</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160;}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#aab733299b170fa5a752503f95f090fcd">&#9670;&nbsp;</a></span>number_of_digits()</h2>
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<td class="memname">int number_of_digits </td>
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<td class="paramtype">int&#160;</td>
<td class="paramname"><em>num</em></td><td>)</td>
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<p>Function to calculate the total number of digits in the number. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">num</td><td>Number </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Total number of digits. </dd></dl>
<div class="fragment"><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160; {</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; <span class="keywordtype">int</span> total_digits = 0;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160; <span class="keywordflow">while</span> (num &gt; 0) {</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160; num = num / 10;</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160; ++total_digits;</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160; }</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160; <span class="keywordflow">return</span> total_digits;</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ae1a3968e7947464bee7714f6d43b7002">&#9670;&nbsp;</a></span>test()</h2>
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<td class="memname">void test </td>
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<p>Function for testing the <a class="el" href="../../d4/d5d/math_2armstrong__number_8cpp.html#a9cebd92bc70890c3cfa261d68a5016e7">is_armstrong()</a> function with all the test cases. </p>
<div class="fragment"><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; {</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="comment">// is_armstrong(370) returns true.</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; assert(<a class="code" href="../../d4/d5d/math_2armstrong__number_8cpp.html#a9cebd92bc70890c3cfa261d68a5016e7">is_armstrong</a>(370) == <span class="keyword">true</span>);</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; <span class="comment">// is_armstrong(225) returns false.</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; assert(<a class="code" href="../../d4/d5d/math_2armstrong__number_8cpp.html#a9cebd92bc70890c3cfa261d68a5016e7">is_armstrong</a>(225) == <span class="keyword">false</span>);</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; <span class="comment">// is_armstrong(-23) returns false.</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; assert(<a class="code" href="../../d4/d5d/math_2armstrong__number_8cpp.html#a9cebd92bc70890c3cfa261d68a5016e7">is_armstrong</a>(-23) == <span class="keyword">false</span>);</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <span class="comment">// is_armstrong(153) returns true.</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; assert(<a class="code" href="../../d4/d5d/math_2armstrong__number_8cpp.html#a9cebd92bc70890c3cfa261d68a5016e7">is_armstrong</a>(153) == <span class="keyword">true</span>);</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="comment">// is_armstrong(0) returns true.</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; assert(<a class="code" href="../../d4/d5d/math_2armstrong__number_8cpp.html#a9cebd92bc70890c3cfa261d68a5016e7">is_armstrong</a>(0) == <span class="keyword">true</span>);</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; <span class="comment">// is_armstrong(12) returns false.</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; assert(<a class="code" href="../../d4/d5d/math_2armstrong__number_8cpp.html#a9cebd92bc70890c3cfa261d68a5016e7">is_armstrong</a>(12) == <span class="keyword">false</span>);</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;}</div>
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<div class="ttc" id="amath_2armstrong__number_8cpp_html_aab733299b170fa5a752503f95f090fcd"><div class="ttname"><a href="../../d4/d5d/math_2armstrong__number_8cpp.html#aab733299b170fa5a752503f95f090fcd">number_of_digits</a></div><div class="ttdeci">int number_of_digits(int num)</div><div class="ttdef"><b>Definition:</b> armstrong_number.cpp:21</div></div>
<div class="ttc" id="amath_2armstrong__number_8cpp_html_a9cebd92bc70890c3cfa261d68a5016e7"><div class="ttname"><a href="../../d4/d5d/math_2armstrong__number_8cpp.html#a9cebd92bc70890c3cfa261d68a5016e7">is_armstrong</a></div><div class="ttdeci">bool is_armstrong(int number)</div><div class="ttdef"><b>Definition:</b> armstrong_number.cpp:36</div></div>
<div class="ttc" id="amath_2armstrong__number_8cpp_html_ae1a3968e7947464bee7714f6d43b7002"><div class="ttname"><a href="../../d4/d5d/math_2armstrong__number_8cpp.html#ae1a3968e7947464bee7714f6d43b7002">test</a></div><div class="ttdeci">void test()</div><div class="ttdef"><b>Definition:</b> armstrong_number.cpp:59</div></div>
<div class="ttc" id="anamespacemachine__learning_html_a5305cc18d11943d3dc0d66e70d7e9c44"><div class="ttname"><a href="../../d8/d77/namespacemachine__learning.html#a5305cc18d11943d3dc0d66e70d7e9c44">machine_learning::sum</a></div><div class="ttdeci">T sum(const std::vector&lt; std::valarray&lt; T &gt;&gt; &amp;A)</div><div class="ttdef"><b>Definition:</b> vector_ops.hpp:228</div></div>
<div class="ttc" id="apow_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/numeric/math/pow.html">std::pow</a></div><div class="ttdeci">T pow(T... args)</div></div>
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