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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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<div class="title">sol1.c File Reference</div> </div>
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<p><a href="https://projecteuler.net/problem=8">Problem 8</a> solution
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;stdio.h&gt;</code><br />
<code>#include &lt;stdlib.h&gt;</code><br />
</div><div class="textblock"><div class="dynheader">
Include dependency graph for sol1.c:</div>
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Functions</h2></td></tr>
<tr class="memitem:a9ffc8845f17b01a353767a40a3adf7bd"><td class="memItemLeft" align="right" valign="top">long long int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dc/d63/problem__8_2sol1_8c.html#a9ffc8845f17b01a353767a40a3adf7bd">get_product</a> (FILE *fp, long start_pos, int num_digits)</td></tr>
<tr class="memdesc:a9ffc8845f17b01a353767a40a3adf7bd"><td class="mdescLeft">&#160;</td><td class="mdescRight">Compute the product of two numbers in a file. <a href="../../dc/d63/problem__8_2sol1_8c.html#a9ffc8845f17b01a353767a40a3adf7bd">More...</a><br /></td></tr>
<tr class="separator:a9ffc8845f17b01a353767a40a3adf7bd"><td class="memSeparator" colspan="2">&#160;</td></tr>
<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="../../dc/d63/problem__8_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=8">Problem 8</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="a9ffc8845f17b01a353767a40a3adf7bd"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a9ffc8845f17b01a353767a40a3adf7bd">&#9670;&nbsp;</a></span>get_product()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">long long int get_product </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">long&#160;</td>
<td class="paramname"><em>start_pos</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>num_digits</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Compute the product of two numbers in a file. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">fp</td><td>pointer to file that is already open </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">start_pos</td><td>line number of the first numer </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">num_digits</td><td>number of digits on the line to multiply </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>expected product </dd></dl>
<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">char</span> ch = <span class="charliteral">&#39; &#39;</span>; <span class="comment">/* temporary variable to store character read from file */</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160; <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> num = 0; <span class="comment">/* temporary variable to store digit read */</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160; <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> prod = 1; <span class="comment">/* product accumulator */</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160; <span class="keywordtype">int</span> <a class="code" href="../../d1/ded/group__misc.html#ga6f8e8c9d25b5891d57e588d80d75028a">count</a> =</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; 0; <span class="comment">/* we use this variable to count number of bytes of file read */</span></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">/* accumulate product for num_digits */</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; num_digits; i++, <a class="code" href="../../d1/ded/group__misc.html#ga6f8e8c9d25b5891d57e588d80d75028a">count</a>++)</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">/* get character from file */</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160; ch = getc(fp);</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; <span class="comment">/* the ASCII codes of digits is between 0x30 and 0x39.</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;<span class="comment"> * any character not in this range implies an invalid character</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; <span class="keywordflow">if</span> (ch &lt; 0x30 || ch &gt; 0x39)</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; {</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; <span class="keywordflow">if</span> (ch == EOF)</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; i--;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; <span class="keywordflow">continue</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; num = ch - 0x30; <span class="comment">/* convert character digit to number */</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; <span class="keywordflow">if</span> (num == 0)</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; {</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <span class="comment">/* If number is zero, we can skip the next &#39;num_digits&#39;</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;<span class="comment"> * because this &#39;0&#39; will repeat in the next &#39;num_digit&#39;</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160;<span class="comment"> * multiplications. Hence, we also do not update the file position</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; <span class="comment">/* NOTE: this is not needed but helps get results faster :) */</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <span class="keywordflow">return</span> 0;</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; </div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; prod *= num; <span class="comment">/* accumulate product */</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; }</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">/* set file position to the next starting character + 1 */</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; fseek(fp, -<a class="code" href="../../d1/ded/group__misc.html#ga6f8e8c9d25b5891d57e588d80d75028a">count</a> + 1, SEEK_CUR);</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> prod;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;}</div>
<div class="ttc" id="agroup__misc_html_ga6f8e8c9d25b5891d57e588d80d75028a"><div class="ttname"><a href="../../d1/ded/group__misc.html#ga6f8e8c9d25b5891d57e588d80d75028a">count</a></div><div class="ttdeci">int count(int *arr, const int size)</div><div class="ttdoc">Count func counts the number of prime numbers.</div><div class="ttdef"><b>Definition:</b> prime_seive.c:42</div></div>
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