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TheAlgorithms-C/d6/d88/problem__16_2sol1_8c.html
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<div id="projectbrief">Set of algorithms implemented in C.</div>
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<div class="headertitle"><div class="title">sol1.c File Reference</div></div>
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<p><a href="https://projecteuler.net/problem=16" target="_blank">Problem 16</a> solution
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;math.h&gt;</code><br />
<code>#include &lt;stdint.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 sol1.c:</div>
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Functions</h2></td></tr>
<tr class="memitem:a3c04138a5bfe5d72780bb7e82a18e627"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d6/d88/problem__16_2sol1_8c.html#a3c04138a5bfe5d72780bb7e82a18e627">main</a> (int argc, char **argv)</td></tr>
<tr class="memdesc:a3c04138a5bfe5d72780bb7e82a18e627"><td class="mdescLeft">&#160;</td><td class="mdescRight">Main function. <a href="../../d6/d88/problem__16_2sol1_8c.html#a3c04138a5bfe5d72780bb7e82a18e627">More...</a><br /></td></tr>
<tr class="separator:a3c04138a5bfe5d72780bb7e82a18e627"><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=16" target="_blank">Problem 16</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="a3c04138a5bfe5d72780bb7e82a18e627" name="a3c04138a5bfe5d72780bb7e82a18e627"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a3c04138a5bfe5d72780bb7e82a18e627">&#9670;&nbsp;</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>
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<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>
<td>)</td>
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<p>Main function. </p>
<div class="fragment"><div class="line"><span class="lineno"> 13</span>{</div>
<div class="line"><span class="lineno"> 14</span> <span class="keyword">const</span> <span class="keywordtype">double</span> tmp = log(10) / log(2); <span class="comment">/* required to get number of digits */</span></div>
<div class="line"><span class="lineno"> 15</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> MAX_NUM_DIGITS;</div>
<div class="line"><span class="lineno"> 16</span> uint8_t *digits =</div>
<div class="line"><span class="lineno"> 17</span> NULL; <span class="comment">/* array to store individual digits. index 0 = units place */</span></div>
<div class="line"><span class="lineno"> 18</span> <span class="keywordtype">int</span> N = 1000, sum = 0;</div>
<div class="line"><span class="lineno"> 19</span> </div>
<div class="line"><span class="lineno"> 20</span> <span class="keywordflow">if</span> (argc == 2)</div>
<div class="line"><span class="lineno"> 21</span> N = atoi(argv[1]);</div>
<div class="line"><span class="lineno"> 22</span> </div>
<div class="line"><span class="lineno"> 23</span> MAX_NUM_DIGITS = (N + tmp) / tmp;</div>
<div class="line"><span class="lineno"> 24</span> </div>
<div class="line"><span class="lineno"> 25</span> digits = <a class="code hl_define" href="../../d2/ddd/malloc__dbg_8h.html#afdddaa949a93c1ef559a638e98f9c21b">calloc</a>(MAX_NUM_DIGITS, <span class="keyword">sizeof</span>(uint8_t));</div>
<div class="line"><span class="lineno"> 26</span> digits[0] = 1;</div>
<div class="line"><span class="lineno"> 27</span> </div>
<div class="line"><span class="lineno"> 28</span> <span class="keywordflow">if</span> (!digits)</div>
<div class="line"><span class="lineno"> 29</span> {</div>
<div class="line"><span class="lineno"> 30</span> perror(<span class="stringliteral">&quot;Unable to allocate memory!&quot;</span>);</div>
<div class="line"><span class="lineno"> 31</span> <span class="keywordflow">return</span> -1;</div>
<div class="line"><span class="lineno"> 32</span> }</div>
<div class="line"><span class="lineno"> 33</span> </div>
<div class="line"><span class="lineno"> 34</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; N; i++)</div>
<div class="line"><span class="lineno"> 35</span> {</div>
<div class="line"><span class="lineno"> 36</span> <span class="keywordtype">int</span> carry = 0;</div>
<div class="line"><span class="lineno"> 37</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j &lt; MAX_NUM_DIGITS; j++)</div>
<div class="line"><span class="lineno"> 38</span> {</div>
<div class="line"><span class="lineno"> 39</span> digits[j] = (digits[j] &lt;&lt; 1) + carry; <span class="comment">/* digit * 2 + carry */</span></div>
<div class="line"><span class="lineno"> 40</span> <span class="comment">// printf(&quot;\t value: %d\t&quot;, digits[j]);</span></div>
<div class="line"><span class="lineno"> 41</span> <span class="keywordflow">if</span> (digits[j] &gt; 9)</div>
<div class="line"><span class="lineno"> 42</span> {</div>
<div class="line"><span class="lineno"> 43</span> carry = 1;</div>
<div class="line"><span class="lineno"> 44</span> digits[j] -= 10;</div>
<div class="line"><span class="lineno"> 45</span> }</div>
<div class="line"><span class="lineno"> 46</span> <span class="keywordflow">else</span></div>
<div class="line"><span class="lineno"> 47</span> carry = 0;</div>
<div class="line"><span class="lineno"> 48</span> <span class="comment">// printf(&quot;carry: %d\t value: %d\n&quot;, carry, digits[j]);</span></div>
<div class="line"><span class="lineno"> 49</span> </div>
<div class="line"><span class="lineno"> 50</span> <span class="comment">/* accumulate sum for last multiplication */</span></div>
<div class="line"><span class="lineno"> 51</span> <span class="keywordflow">if</span> (i == N - 1)</div>
<div class="line"><span class="lineno"> 52</span> sum += digits[j];</div>
<div class="line"><span class="lineno"> 53</span> }</div>
<div class="line"><span class="lineno"> 54</span> }</div>
<div class="line"><span class="lineno"> 55</span> </div>
<div class="line"><span class="lineno"> 56</span> printf(<span class="stringliteral">&quot;2^%d = &quot;</span>, N);</div>
<div class="line"><span class="lineno"> 57</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = MAX_NUM_DIGITS - 1; i &gt;= 0; i--) putchar(digits[i] + 0x30);</div>
<div class="line"><span class="lineno"> 58</span> printf(<span class="stringliteral">&quot;\n\t Sum: %d\t Num. digits: %lu\n&quot;</span>, sum, MAX_NUM_DIGITS);</div>
<div class="line"><span class="lineno"> 59</span> </div>
<div class="line"><span class="lineno"> 60</span> <a class="code hl_define" href="../../d2/ddd/malloc__dbg_8h.html#a9cc854374299a1dd933bf62029761768">free</a>(digits);</div>
<div class="line"><span class="lineno"> 61</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 62</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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