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<p><a href="https://projecteuler.net/problem=25">Problem 25</a> solution implemented using arbitrarily large numbers represented as arrays
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;stdint.h&gt;</code><br />
<code>#include &lt;stdio.h&gt;</code><br />
<code>#include &lt;stdlib.h&gt;</code><br />
<code>#include &lt;string.h&gt;</code><br />
<code>#include &lt;time.h&gt;</code><br />
</div><div class="textblock"><div class="dynheader">
Include dependency graph for sol1.c:</div>
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Macros</h2></td></tr>
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#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d8/d32/problem__25_2sol1_8c.html#a001791a21d538b8b9176287ae60d9b61">MAX_DIGITS</a>&#160;&#160;&#160;1000</td></tr>
<tr class="memdesc:a001791a21d538b8b9176287ae60d9b61"><td class="mdescLeft">&#160;</td><td class="mdescRight">maximum number of digits <br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:af9729befaffc1aab9ac9fedc4706e66c"><td class="memItemLeft" align="right" valign="top">unsigned int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d8/d32/problem__25_2sol1_8c.html#af9729befaffc1aab9ac9fedc4706e66c">add_numbers</a> (unsigned char *a, unsigned char *b, unsigned char *c, int N)</td></tr>
<tr class="memdesc:af9729befaffc1aab9ac9fedc4706e66c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function to add arbitraty length decimal integers stored in an array. <a href="../../d8/d32/problem__25_2sol1_8c.html#af9729befaffc1aab9ac9fedc4706e66c">More...</a><br /></td></tr>
<tr class="separator:af9729befaffc1aab9ac9fedc4706e66c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:abe5bc1f170b2108a19d0a16d30bd3235"><td class="memItemLeft" align="right" valign="top"><a id="abe5bc1f170b2108a19d0a16d30bd3235"></a>
int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d8/d32/problem__25_2sol1_8c.html#abe5bc1f170b2108a19d0a16d30bd3235">print_number</a> (unsigned char *number, int N)</td></tr>
<tr class="memdesc:abe5bc1f170b2108a19d0a16d30bd3235"><td class="mdescLeft">&#160;</td><td class="mdescRight">Print a large number. <br /></td></tr>
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<tr class="memitem:a2b90df6bfbf0d18cd9a19c1a71453783"><td class="memItemLeft" align="right" valign="top"><a id="a2b90df6bfbf0d18cd9a19c1a71453783"></a>
unsigned int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d8/d32/problem__25_2sol1_8c.html#a2b90df6bfbf0d18cd9a19c1a71453783">get_digits</a> (unsigned char *number)</td></tr>
<tr class="memdesc:a2b90df6bfbf0d18cd9a19c1a71453783"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get number of digits in a large number. <br /></td></tr>
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<tr class="memitem:a0ddf1224851353fc92bfbff6f499fa97"><td class="memItemLeft" align="right" valign="top"><a id="a0ddf1224851353fc92bfbff6f499fa97"></a>
int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d8/d32/problem__25_2sol1_8c.html#a0ddf1224851353fc92bfbff6f499fa97">main</a> (int argc, char *argv[])</td></tr>
<tr class="memdesc:a0ddf1224851353fc92bfbff6f499fa97"><td class="mdescLeft">&#160;</td><td class="mdescRight">Main function. <br /></td></tr>
<tr class="separator:a0ddf1224851353fc92bfbff6f499fa97"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p><a href="https://projecteuler.net/problem=25">Problem 25</a> solution implemented using arbitrarily large numbers represented as arrays </p>
<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/kvedala">Krishna Vedala</a> </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="af9729befaffc1aab9ac9fedc4706e66c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#af9729befaffc1aab9ac9fedc4706e66c">&#9670;&nbsp;</a></span>add_numbers()</h2>
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<td class="memname">unsigned int add_numbers </td>
<td>(</td>
<td class="paramtype">unsigned char *&#160;</td>
<td class="paramname"><em>a</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned char *&#160;</td>
<td class="paramname"><em>b</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned char *&#160;</td>
<td class="paramname"><em>c</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>N</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Function to add arbitraty length decimal integers stored in an array. </p>
<p><br />
a + b = c = new b </p>
<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">unsigned</span> <span class="keywordtype">char</span> carry = 0;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160; <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160; </div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160; <span class="keywordflow">for</span> (i = 0; i &lt; N; i++)</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="comment">// printf(&quot;\t%d + %d + %d &quot;, a[i], b[i], carry);</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160; c[i] = carry + a[i] + b[i];</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; <span class="keywordflow">if</span> (c[i] &gt; 9) <span class="comment">/* check for carry */</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; {</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; carry = 1;</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; c[i] -= 10;</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; }</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; {</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; carry = 0;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; }</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; <span class="comment">// printf(&quot;= %d, %d\n&quot;, carry, c[i]);</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; }</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="keywordflow">while</span> (carry != 0)</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; {</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; <span class="comment">// printf(&quot;\t\t...adding new digit\n&quot;);</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <span class="comment">// printf(&quot;\t0 + %d + %d &quot;, b[i], carry);</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; c[i] = carry + c[i];</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; <span class="keywordflow">if</span> (c[i] &gt; 9)</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; {</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; carry = 1;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; c[i] -= 10;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; }</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; {</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; carry = 0;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; }</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="comment">// printf(&quot;= %d, %d\n&quot;, carry, c[i]);</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; i++;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; }</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="keywordflow">return</span> i;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;}</div>
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