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&#160;<span id="projectnumber">1.0.0</span>
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<div id="projectbrief">Set of algorithms implemented in C.</div>
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<p><a href="https://projecteuler.net/problem=13">Problem 13</a> solution
<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 />
</div><div class="textblock"><div class="dynheader">
Include dependency graph for sol1.c:</div>
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Macros</h2></td></tr>
<tr class="memitem:a0240ac851181b84ac374872dc5434ee4"><td class="memItemLeft" align="right" valign="top"><a id="a0240ac851181b84ac374872dc5434ee4"></a>
#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>&#160;&#160;&#160;10</td></tr>
<tr class="memdesc:a0240ac851181b84ac374872dc5434ee4"><td class="mdescLeft">&#160;</td><td class="mdescRight">number of digits of the large number <br /></td></tr>
<tr class="separator:a0240ac851181b84ac374872dc5434ee4"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:acd864640121c7df2c19f61f7baa507e4"><td class="memItemLeft" align="right" valign="top"><a id="acd864640121c7df2c19f61f7baa507e4"></a>
#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../db/d01/problem__13_2sol1_8c.html#acd864640121c7df2c19f61f7baa507e4">N2</a>&#160;&#160;&#160;(<a class="el" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a> + 10)</td></tr>
<tr class="memdesc:acd864640121c7df2c19f61f7baa507e4"><td class="mdescLeft">&#160;</td><td class="mdescRight">number of digits in output number <br /></td></tr>
<tr class="separator:acd864640121c7df2c19f61f7baa507e4"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ac260f58785fb20eb09bb35385a7d47f8"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../db/d01/problem__13_2sol1_8c.html#ac260f58785fb20eb09bb35385a7d47f8">get_number</a> (FILE *fp, char *buffer, uint8_t *out_int)</td></tr>
<tr class="memdesc:ac260f58785fb20eb09bb35385a7d47f8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function to read the number from a file and store it in array. <a href="../../db/d01/problem__13_2sol1_8c.html#ac260f58785fb20eb09bb35385a7d47f8">More...</a><br /></td></tr>
<tr class="separator:ac260f58785fb20eb09bb35385a7d47f8"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ad51742ca5a5c99e860bdf30299163bf2"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../db/d01/problem__13_2sol1_8c.html#ad51742ca5a5c99e860bdf30299163bf2">add_numbers</a> (uint8_t *a, uint8_t *b, uint8_t <a class="el" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>)</td></tr>
<tr class="memdesc:ad51742ca5a5c99e860bdf30299163bf2"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function to add arbitraty length decimal integers stored in an array. <a href="../../db/d01/problem__13_2sol1_8c.html#ad51742ca5a5c99e860bdf30299163bf2">More...</a><br /></td></tr>
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int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../db/d01/problem__13_2sol1_8c.html#a248adc917818cc6666d8bc679a660319">print_number</a> (uint8_t *number, uint8_t <a class="el" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>, int8_t num_digits_to_print)</td></tr>
<tr class="memdesc:a248adc917818cc6666d8bc679a660319"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function to print a long number. <br /></td></tr>
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<tr class="memitem:a840291bc02cba5474a4cb46a9b9566fe"><td class="memItemLeft" align="right" valign="top"><a id="a840291bc02cba5474a4cb46a9b9566fe"></a>
int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../db/d01/problem__13_2sol1_8c.html#a840291bc02cba5474a4cb46a9b9566fe">main</a> (void)</td></tr>
<tr class="memdesc:a840291bc02cba5474a4cb46a9b9566fe"><td class="mdescLeft">&#160;</td><td class="mdescRight">Main function. <br /></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=13">Problem 13</a> solution </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="ad51742ca5a5c99e860bdf30299163bf2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ad51742ca5a5c99e860bdf30299163bf2">&#9670;&nbsp;</a></span>add_numbers()</h2>
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<td class="memname">int add_numbers </td>
<td>(</td>
<td class="paramtype">uint8_t *&#160;</td>
<td class="paramname"><em>a</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t *&#160;</td>
<td class="paramname"><em>b</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t&#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>a + b = c = new b </p>
<div class="fragment"><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;{</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; <span class="keywordtype">int</span> carry = 0;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; uint8_t *c = b; <span class="comment">/* accumulate the result in the array &#39;b&#39; */</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; </div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; <a class="code" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>; i++)</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="comment">// printf(&quot;\t%d + %d + %d &quot;, a[i], b[i], carry);</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; c[i] = carry + a[i] + b[i];</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="keywordflow">if</span> (c[i] &gt; 9) <span class="comment">/* check for carry */</span></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; carry = 1;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; c[i] -= 10;</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">else</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; carry = 0;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="comment">// printf(&quot;= %d, %d\n&quot;, carry, c[i]);</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; }</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; </div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = <a class="code" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>; i &lt; <a class="code" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a> + 10; i++)</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; {</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; <span class="keywordflow">if</span> (carry == 0)</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="comment">// printf(&quot;\t0 + %d + %d &quot;, b[i], carry);</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; c[i] = carry + c[i];</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <span class="keywordflow">if</span> (c[i] &gt; 9)</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; {</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; carry = 1;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; c[i] -= 10;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; }</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; carry = 0;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; <span class="comment">// printf(&quot;= %d, %d\n&quot;, carry, c[i]);</span></div>
<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; <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160;}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ac260f58785fb20eb09bb35385a7d47f8">&#9670;&nbsp;</a></span>get_number()</h2>
<div class="memitem">
<div class="memproto">
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<td class="memname">int get_number </td>
<td>(</td>
<td class="paramtype">FILE *&#160;</td>
<td class="paramname"><em>fp</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">char *&#160;</td>
<td class="paramname"><em>buffer</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t *&#160;</td>
<td class="paramname"><em>out_int</em>&#160;</td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td>
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<p>Function to read the number from a file and store it in array. </p>
<p><br />
index 0 of output buffer =&gt; units place <br />
index 1 of output buffer =&gt; tens place and so on i.e., index i =&gt; 10^i th place </p>
<div class="fragment"><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;{</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160; <span class="keywordtype">long</span> l = fscanf(fp, <span class="stringliteral">&quot;%s\n&quot;</span>, buffer);</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160; <span class="keywordflow">if</span> (!l)</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160; {</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160; perror(<span class="stringliteral">&quot;Error reading line.&quot;</span>);</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; <span class="keywordflow">return</span> -1;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160; }</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160; <span class="comment">// printf(&quot;Number: %s\t length: %ld, %ld\n&quot;, buffer, strlen(buffer), l);</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160; </div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160; <span class="keywordtype">long</span> <a class="code" href="../../df/db3/struct_l.html">L</a> = strlen(buffer);</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160; </div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; <a class="code" href="../../df/db3/struct_l.html">L</a>; i++)</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; <span class="keywordflow">if</span> (buffer[i] &lt; 0x30 || buffer[i] &gt; 0x39)</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; perror(<span class="stringliteral">&quot;found inavlid character in the number!&quot;</span>);</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; <span class="keywordflow">return</span> -1;</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; out_int[<a class="code" href="../../df/db3/struct_l.html">L</a> - i - 1] = buffer[i] - 0x30;</div>
<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="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;}</div>
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<div class="ttc" id="astruct_l_html"><div class="ttname"><a href="../../df/db3/struct_l.html">L</a></div><div class="ttdef"><b>Definition:</b> list.h:8</div></div>
<div class="ttc" id="aproblem__13_2sol1_8c_html_a0240ac851181b84ac374872dc5434ee4"><div class="ttname"><a href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a></div><div class="ttdeci">#define N</div><div class="ttdoc">number of digits of the large number</div><div class="ttdef"><b>Definition:</b> sol1.c:109</div></div>
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