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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=10" target="_blank">Problem 10</a> solution
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;math.h&gt;</code><br />
<code>#include &lt;stdio.h&gt;</code><br />
<code>#include &lt;stdlib.h&gt;</code><br />
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Include dependency graph for sol2.c:</div>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:a0ddf1224851353fc92bfbff6f499fa97" id="r_a0ddf1224851353fc92bfbff6f499fa97"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d9/da7/problem__10_2sol2_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>
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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=10" target="_blank">Problem 10</a> solution </p>
<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/kvedala" target="_blank">Krishna Vedala</a> </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="a0ddf1224851353fc92bfbff6f499fa97" name="a0ddf1224851353fc92bfbff6f499fa97"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a0ddf1224851353fc92bfbff6f499fa97">&#9670;&#160;</a></span>main()</h2>
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<td class="memname">int main </td>
<td>(</td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>argc</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">char *&#160;</td>
<td class="paramname"><em>argv</em>[]&#160;</td>
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<td>)</td>
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<p>Main function. </p>
<div class="fragment"><div class="line"><span class="lineno"> 12</span>{</div>
<div class="line"><span class="lineno"> 13</span> <span class="keywordtype">long</span> n = 100;</div>
<div class="line"><span class="lineno"> 14</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> sum = 0;</div>
<div class="line"><span class="lineno"> 15</span> <span class="keywordtype">char</span> *sieve = NULL;</div>
<div class="line"><span class="lineno"> 16</span> </div>
<div class="line"><span class="lineno"> 17</span> <span class="keywordflow">if</span> (argc == 2) <span class="comment">/* if command line argument is provided */</span></div>
<div class="line"><span class="lineno"> 18</span> n = atol(argv[1]); <span class="comment">/* use that as the upper limit */</span></div>
<div class="line"><span class="lineno"> 19</span> </div>
<div class="line"><span class="lineno"> 20</span> <span class="comment">/* allocate memory for the sieve */</span></div>
<div class="line"><span class="lineno"> 21</span> sieve = <a class="code hl_define" href="../../d2/ddd/malloc__dbg_8h.html#afdddaa949a93c1ef559a638e98f9c21b">calloc</a>(n, <span class="keyword">sizeof</span>(*sieve));</div>
<div class="line"><span class="lineno"> 22</span> <span class="keywordflow">if</span> (!sieve)</div>
<div class="line"><span class="lineno"> 23</span> {</div>
<div class="line"><span class="lineno"> 24</span> perror(<span class="stringliteral">&quot;Unable to allocate memory!&quot;</span>);</div>
<div class="line"><span class="lineno"> 25</span> <span class="keywordflow">return</span> -1;</div>
<div class="line"><span class="lineno"> 26</span> }</div>
<div class="line"><span class="lineno"> 27</span> </div>
<div class="line"><span class="lineno"> 28</span> <span class="comment">/* build sieve of Eratosthenes</span></div>
<div class="line"><span class="lineno"> 29</span><span class="comment"> In the array,</span></div>
<div class="line"><span class="lineno"> 30</span><span class="comment"> * if i^th cell is &#39;1&#39;, then &#39;i&#39; is composite</span></div>
<div class="line"><span class="lineno"> 31</span><span class="comment"> * if i^th cell is &#39;0&#39;, then &#39;i&#39; is prime</span></div>
<div class="line"><span class="lineno"> 32</span><span class="comment"> */</span></div>
<div class="line"><span class="lineno"> 33</span> <span class="keywordflow">for</span> (<span class="keywordtype">long</span> i = 2; i &lt; sqrtl(n); i++)</div>
<div class="line"><span class="lineno"> 34</span> {</div>
<div class="line"><span class="lineno"> 35</span> <span class="comment">/* if i^th element is prime, mark all its multiples</span></div>
<div class="line"><span class="lineno"> 36</span><span class="comment"> as composites */</span></div>
<div class="line"><span class="lineno"> 37</span> <span class="keywordflow">if</span> (!sieve[i])</div>
<div class="line"><span class="lineno"> 38</span> {</div>
<div class="line"><span class="lineno"> 39</span> <span class="keywordflow">for</span> (<span class="keywordtype">long</span> j = i * i; j &lt; n + 1; j += i)</div>
<div class="line"><span class="lineno"> 40</span> {</div>
<div class="line"><span class="lineno"> 41</span> sieve[j] = 1;</div>
<div class="line"><span class="lineno"> 42</span> }</div>
<div class="line"><span class="lineno"> 43</span> sum += i;</div>
<div class="line"><span class="lineno"> 44</span> }</div>
<div class="line"><span class="lineno"> 45</span> }</div>
<div class="line"><span class="lineno"> 46</span> </div>
<div class="line"><span class="lineno"> 47</span> <span class="keywordflow">for</span> (<span class="keywordtype">long</span> i = sqrtl(n) + 1; i &lt; n; i++)</div>
<div class="line"><span class="lineno"> 48</span> <span class="keywordflow">if</span> (!sieve[i])</div>
<div class="line"><span class="lineno"> 49</span> sum += i;</div>
<div class="line"><span class="lineno"> 50</span> </div>
<div class="line"><span class="lineno"> 51</span> <a class="code hl_define" href="../../d2/ddd/malloc__dbg_8h.html#a9cc854374299a1dd933bf62029761768">free</a>(sieve);</div>
<div class="line"><span class="lineno"> 52</span> </div>
<div class="line"><span class="lineno"> 53</span> printf(<span class="stringliteral">&quot;%ld: %lld\n&quot;</span>, n, sum);</div>
<div class="line"><span class="lineno"> 54</span> </div>
<div class="line"><span class="lineno"> 55</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 56</span>}</div>
<div class="ttc" id="amalloc__dbg_8h_html_a9cc854374299a1dd933bf62029761768"><div class="ttname"><a href="../../d2/ddd/malloc__dbg_8h.html#a9cc854374299a1dd933bf62029761768">free</a></div><div class="ttdeci">#define free(ptr)</div><div class="ttdoc">This macro replace the standard free function with free_dbg.</div><div class="ttdef"><b>Definition</b> malloc_dbg.h:26</div></div>
<div class="ttc" id="amalloc__dbg_8h_html_afdddaa949a93c1ef559a638e98f9c21b"><div class="ttname"><a href="../../d2/ddd/malloc__dbg_8h.html#afdddaa949a93c1ef559a638e98f9c21b">calloc</a></div><div class="ttdeci">#define calloc(elemCount, elemSize)</div><div class="ttdoc">This macro replace the standard calloc function with calloc_dbg.</div><div class="ttdef"><b>Definition</b> malloc_dbg.h:22</div></div>
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