mirror of
https://github.moeyy.xyz/https://github.com/TheAlgorithms/C.git
synced 2023-10-11 15:56:24 +08:00
405 lines
36 KiB
HTML
405 lines
36 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
|
|
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
|
|
<meta name="generator" content="Doxygen 1.8.18"/>
|
|
<meta name="viewport" content="width=device-width, initial-scale=1"/>
|
|
<title>Algorithms_in_C: project_euler/problem_20/sol1.c File Reference</title>
|
|
<link href="../../tabs.css" rel="stylesheet" type="text/css"/>
|
|
<script type="text/javascript" src="../../jquery.js"></script>
|
|
<script type="text/javascript" src="../../dynsections.js"></script>
|
|
<link href="../../navtree.css" rel="stylesheet" type="text/css"/>
|
|
<script type="text/javascript" src="../../resize.js"></script>
|
|
<script type="text/javascript" src="../../navtreedata.js"></script>
|
|
<script type="text/javascript" src="../../navtree.js"></script>
|
|
<link href="../../search/search.css" rel="stylesheet" type="text/css"/>
|
|
<script type="text/javascript" src="../../search/searchdata.js"></script>
|
|
<script type="text/javascript" src="../../search/search.js"></script>
|
|
<script type="text/x-mathjax-config">
|
|
MathJax.Hub.Config({
|
|
extensions: ["tex2jax.js", "TeX/AMSmath.js", "TeX/AMSsymbols.js"],
|
|
jax: ["input/TeX","output/HTML-CSS"],
|
|
});
|
|
</script>
|
|
<script type="text/javascript" async="async" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/MathJax.js?config=TeX-MML-AM_CHTML/MathJax.js"></script>
|
|
<link href="../../doxygen.css" rel="stylesheet" type="text/css" />
|
|
</head>
|
|
<body>
|
|
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
|
|
<div id="titlearea">
|
|
<table cellspacing="0" cellpadding="0">
|
|
<tbody>
|
|
<tr style="height: 56px;">
|
|
<td id="projectalign" style="padding-left: 0.5em;">
|
|
<div id="projectname">Algorithms_in_C
|
|
 <span id="projectnumber">1.0.0</span>
|
|
</div>
|
|
<div id="projectbrief">Set of algorithms implemented in C.</div>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
<!-- end header part -->
|
|
<!-- Generated by Doxygen 1.8.18 -->
|
|
<script type="text/javascript">
|
|
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
|
|
var searchBox = new SearchBox("searchBox", "../../search",false,'Search');
|
|
/* @license-end */
|
|
</script>
|
|
<script type="text/javascript" src="../../menudata.js"></script>
|
|
<script type="text/javascript" src="../../menu.js"></script>
|
|
<script type="text/javascript">
|
|
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
|
|
$(function() {
|
|
initMenu('../../',true,false,'search.php','Search');
|
|
$(document).ready(function() { init_search(); });
|
|
});
|
|
/* @license-end */</script>
|
|
<div id="main-nav"></div>
|
|
</div><!-- top -->
|
|
<div id="side-nav" class="ui-resizable side-nav-resizable">
|
|
<div id="nav-tree">
|
|
<div id="nav-tree-contents">
|
|
<div id="nav-sync" class="sync"></div>
|
|
</div>
|
|
</div>
|
|
<div id="splitbar" style="-moz-user-select:none;"
|
|
class="ui-resizable-handle">
|
|
</div>
|
|
</div>
|
|
<script type="text/javascript">
|
|
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
|
|
$(document).ready(function(){initNavTree('db/d80/problem__20_2sol1_8c.html','../../'); initResizable(); });
|
|
/* @license-end */
|
|
</script>
|
|
<div id="doc-content">
|
|
<!-- window showing the filter options -->
|
|
<div id="MSearchSelectWindow"
|
|
onmouseover="return searchBox.OnSearchSelectShow()"
|
|
onmouseout="return searchBox.OnSearchSelectHide()"
|
|
onkeydown="return searchBox.OnSearchSelectKey(event)">
|
|
</div>
|
|
|
|
<!-- iframe showing the search results (closed by default) -->
|
|
<div id="MSearchResultsWindow">
|
|
<iframe src="javascript:void(0)" frameborder="0"
|
|
name="MSearchResults" id="MSearchResults">
|
|
</iframe>
|
|
</div>
|
|
|
|
<div class="header">
|
|
<div class="summary">
|
|
<a href="#nested-classes">Data Structures</a> |
|
|
<a href="#typedef-members">Typedefs</a> |
|
|
<a href="#func-members">Functions</a> </div>
|
|
<div class="headertitle">
|
|
<div class="title">sol1.c File Reference</div> </div>
|
|
</div><!--header-->
|
|
<div class="contents">
|
|
|
|
<p><a href="https://projecteuler.net/problem=20">Problem 20</a> solution
|
|
<a href="#details">More...</a></p>
|
|
<div class="textblock"><code>#include <stdio.h></code><br />
|
|
<code>#include <stdlib.h></code><br />
|
|
<code>#include <time.h></code><br />
|
|
</div><div class="textblock"><div class="dynheader">
|
|
Include dependency graph for sol1.c:</div>
|
|
<div class="dyncontent">
|
|
<div class="center"><iframe scrolling="no" frameborder="0" src="../../d9/d7e/problem__20_2sol1_8c__incl.svg" width="243" height="127"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe>
|
|
</div>
|
|
</div>
|
|
</div><table class="memberdecls">
|
|
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
|
|
Data Structures</h2></td></tr>
|
|
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="../../dc/d77/struct__big__int.html">_big_int</a></td></tr>
|
|
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
|
|
</table><table class="memberdecls">
|
|
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="typedef-members"></a>
|
|
Typedefs</h2></td></tr>
|
|
<tr class="memitem:a62cbbd106aad52daadb9403a07d0da32"><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="../../dc/d77/struct__big__int.html">_big_int</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32">big_int</a></td></tr>
|
|
<tr class="separator:a62cbbd106aad52daadb9403a07d0da32"><td class="memSeparator" colspan="2"> </td></tr>
|
|
</table><table class="memberdecls">
|
|
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
|
|
Functions</h2></td></tr>
|
|
<tr class="memitem:afc373c28da6b17636528edcc97fb5f86"><td class="memItemLeft" align="right" valign="top"><a class="el" href="../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32">big_int</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="../../db/d80/problem__20_2sol1_8c.html#afc373c28da6b17636528edcc97fb5f86">add_digit</a> (<a class="el" href="../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32">big_int</a> *digit, char value)</td></tr>
|
|
<tr class="separator:afc373c28da6b17636528edcc97fb5f86"><td class="memSeparator" colspan="2"> </td></tr>
|
|
<tr class="memitem:a54a02c4b963fdb16f24959e0137763f1"><td class="memItemLeft" align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="../../db/d80/problem__20_2sol1_8c.html#a54a02c4b963fdb16f24959e0137763f1">remove_digits</a> (<a class="el" href="../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32">big_int</a> *digit, int <a class="el" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>)</td></tr>
|
|
<tr class="separator:a54a02c4b963fdb16f24959e0137763f1"><td class="memSeparator" colspan="2"> </td></tr>
|
|
<tr class="memitem:a3c04138a5bfe5d72780bb7e82a18e627"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="../../db/d80/problem__20_2sol1_8c.html#a3c04138a5bfe5d72780bb7e82a18e627">main</a> (int argc, char **argv)</td></tr>
|
|
<tr class="separator:a3c04138a5bfe5d72780bb7e82a18e627"><td class="memSeparator" colspan="2"> </td></tr>
|
|
</table>
|
|
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
|
|
<div class="textblock"><p><a href="https://projecteuler.net/problem=20">Problem 20</a> solution </p>
|
|
<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/kvedala">Krishna Vedala</a></dd></dl>
|
|
<p>Implementation uses a custom <code>big_int</code> structure that can store arbitrarilty large integer numbers. </p>
|
|
</div><h2 class="groupheader">Typedef Documentation</h2>
|
|
<a id="a62cbbd106aad52daadb9403a07d0da32"></a>
|
|
<h2 class="memtitle"><span class="permalink"><a href="#a62cbbd106aad52daadb9403a07d0da32">◆ </a></span>big_int</h2>
|
|
|
|
<div class="memitem">
|
|
<div class="memproto">
|
|
<table class="memname">
|
|
<tr>
|
|
<td class="memname">typedef struct <a class="el" href="../../dc/d77/struct__big__int.html">_big_int</a> <a class="el" href="../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32">big_int</a></td>
|
|
</tr>
|
|
</table>
|
|
</div><div class="memdoc">
|
|
<p>store arbitratily large integer values as a linked list of digits. </p>
|
|
|
|
</div>
|
|
</div>
|
|
<h2 class="groupheader">Function Documentation</h2>
|
|
<a id="afc373c28da6b17636528edcc97fb5f86"></a>
|
|
<h2 class="memtitle"><span class="permalink"><a href="#afc373c28da6b17636528edcc97fb5f86">◆ </a></span>add_digit()</h2>
|
|
|
|
<div class="memitem">
|
|
<div class="memproto">
|
|
<table class="memname">
|
|
<tr>
|
|
<td class="memname"><a class="el" href="../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32">big_int</a>* add_digit </td>
|
|
<td>(</td>
|
|
<td class="paramtype"><a class="el" href="../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32">big_int</a> * </td>
|
|
<td class="paramname"><em>digit</em>, </td>
|
|
</tr>
|
|
<tr>
|
|
<td class="paramkey"></td>
|
|
<td></td>
|
|
<td class="paramtype">char </td>
|
|
<td class="paramname"><em>value</em> </td>
|
|
</tr>
|
|
<tr>
|
|
<td></td>
|
|
<td>)</td>
|
|
<td></td><td></td>
|
|
</tr>
|
|
</table>
|
|
</div><div class="memdoc">
|
|
<p>Function that allocates memory to add another digit at the MSB </p>
|
|
<div class="fragment"><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> {</div>
|
|
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">if</span> (digit == NULL)</div>
|
|
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  {</div>
|
|
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  digit = (<a class="code" href="../../dc/d77/struct__big__int.html">big_int</a> *)malloc(<span class="keyword">sizeof</span>(<a class="code" href="../../dc/d77/struct__big__int.html">big_int</a>));</div>
|
|
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordflow">if</span> (!digit)</div>
|
|
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  {</div>
|
|
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  perror(<span class="stringliteral">"Unable to allocate memory!"</span>);</div>
|
|
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">return</span> NULL;</div>
|
|
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  }</div>
|
|
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  digit->value = value;</div>
|
|
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  digit-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a> = NULL;</div>
|
|
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  digit-><a class="code" href="../../dc/d77/struct__big__int.html#ad8405989a924410942b39ec0e9fef30b">prev_digit</a> = NULL;</div>
|
|
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  </div>
|
|
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">return</span> digit;</div>
|
|
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  }</div>
|
|
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  </div>
|
|
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">if</span> (digit-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a>)</div>
|
|
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  {</div>
|
|
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  digit-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a>->value = value;</div>
|
|
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">return</span> digit-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a>;</div>
|
|
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  }</div>
|
|
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  </div>
|
|
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  digit-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a> = (<a class="code" href="../../dc/d77/struct__big__int.html">big_int</a> *)malloc(<span class="keyword">sizeof</span>(<a class="code" href="../../dc/d77/struct__big__int.html">big_int</a>));</div>
|
|
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">if</span> (digit-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a> == NULL)</div>
|
|
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  {</div>
|
|
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  perror(<span class="stringliteral">"Unable to allocate memory!"</span>);</div>
|
|
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">return</span> NULL;</div>
|
|
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  }</div>
|
|
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  digit-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a>->value = value;</div>
|
|
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  digit-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a>-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a> = NULL;</div>
|
|
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  digit-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a>-><a class="code" href="../../dc/d77/struct__big__int.html#ad8405989a924410942b39ec0e9fef30b">prev_digit</a> = digit;</div>
|
|
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">return</span> digit-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a>;</div>
|
|
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> }</div>
|
|
</div><!-- fragment -->
|
|
</div>
|
|
</div>
|
|
<a id="a3c04138a5bfe5d72780bb7e82a18e627"></a>
|
|
<h2 class="memtitle"><span class="permalink"><a href="#a3c04138a5bfe5d72780bb7e82a18e627">◆ </a></span>main()</h2>
|
|
|
|
<div class="memitem">
|
|
<div class="memproto">
|
|
<table class="memname">
|
|
<tr>
|
|
<td class="memname">int main </td>
|
|
<td>(</td>
|
|
<td class="paramtype">int </td>
|
|
<td class="paramname"><em>argc</em>, </td>
|
|
</tr>
|
|
<tr>
|
|
<td class="paramkey"></td>
|
|
<td></td>
|
|
<td class="paramtype">char ** </td>
|
|
<td class="paramname"><em>argv</em> </td>
|
|
</tr>
|
|
<tr>
|
|
<td></td>
|
|
<td>)</td>
|
|
<td></td><td></td>
|
|
</tr>
|
|
</table>
|
|
</div><div class="memdoc">
|
|
<p>Main function </p>
|
|
<p>sum digits on the last iteration this avoid having another loop over all digits</p>
|
|
<p>Notice that in the loop above, we make sure that at the end of the loop, ptr is pointing to the last digit. Thus we can avoid using another loop.</p>
|
|
<div class="fragment"><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> {</div>
|
|
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a> = 5;</div>
|
|
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <a class="code" href="../../dc/d77/struct__big__int.html">big_int</a> *ptr = <a class="code" href="../../db/d80/problem__20_2sol1_8c.html#afc373c28da6b17636528edcc97fb5f86">add_digit</a>(NULL, 1); <span class="comment">/* start with 1 */</span></div>
|
|
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keyword">const</span> <a class="code" href="../../dc/d77/struct__big__int.html">big_int</a> *ptr0 = ptr; <span class="comment">/* save the first location */</span></div>
|
|
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> sum_digits = 0;</div>
|
|
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> num_digits = 0;</div>
|
|
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  </div>
|
|
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">if</span> (argc == 2)</div>
|
|
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <a class="code" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a> = atoi(argv[1]);</div>
|
|
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  </div>
|
|
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  clock_t start_time = clock();</div>
|
|
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  </div>
|
|
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i = 1; i <= <a class="code" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>; i++)</div>
|
|
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  {</div>
|
|
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordtype">int</span> carry = 0;</div>
|
|
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="preprocessor">#ifdef DEBUG</span></div>
|
|
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  printf(<span class="stringliteral">"%3d: "</span>, i);</div>
|
|
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="preprocessor">#endif</span></div>
|
|
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  ptr = (<a class="code" href="../../dc/d77/struct__big__int.html">big_int</a> *)ptr0; <span class="comment">/* multiply every digit with i */</span></div>
|
|
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">while</span> (ptr)</div>
|
|
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  {</div>
|
|
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="preprocessor">#ifdef DEBUG</span></div>
|
|
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  printf(<span class="stringliteral">"%p\t"</span>, ptr);</div>
|
|
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="preprocessor">#endif</span></div>
|
|
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> tmp = ptr->value * i + carry;</div>
|
|
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">if</span> (tmp >= 10)</div>
|
|
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  {</div>
|
|
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  div_t tmp2 = div(tmp, 10);</div>
|
|
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  carry = tmp2.quot;</div>
|
|
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  tmp = tmp2.rem;</div>
|
|
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  }</div>
|
|
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">else</span></div>
|
|
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  carry = 0;</div>
|
|
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  </div>
|
|
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">if</span> (carry > 0 && ptr-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a> == NULL)</div>
|
|
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <a class="code" href="../../db/d80/problem__20_2sol1_8c.html#afc373c28da6b17636528edcc97fb5f86">add_digit</a>(ptr, 0);</div>
|
|
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  </div>
|
|
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  ptr->value = tmp;</div>
|
|
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  </div>
|
|
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keywordflow">if</span> (i == <a class="code" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>)<span class="comment"></span></div>
|
|
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment"> /**</span></div>
|
|
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment"> * sum digits on the last iteration</span></div>
|
|
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"> * this avoid having another loop over all digits</span></div>
|
|
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> **/</span></div>
|
|
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  sum_digits += tmp;</div>
|
|
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  </div>
|
|
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">if</span> (ptr-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a>)</div>
|
|
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="comment">/* more digits available */</span></div>
|
|
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  ptr = ptr-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a>;</div>
|
|
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">else</span></div>
|
|
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="comment">/* no more digits left - reached MSB */</span></div>
|
|
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">break</span>;</div>
|
|
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  }</div>
|
|
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="preprocessor">#ifdef DEBUG</span></div>
|
|
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  printf(<span class="stringliteral">"\n"</span>);</div>
|
|
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="preprocessor">#endif</span></div>
|
|
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  }</div>
|
|
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  </div>
|
|
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  clock_t end_time = clock();</div>
|
|
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  </div>
|
|
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="preprocessor">#ifdef DEBUG</span></div>
|
|
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  printf(<span class="stringliteral">"ptr = %p\n"</span>, ptr);</div>
|
|
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  printf(<span class="stringliteral">"%d! = "</span>, <a class="code" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a>);</div>
|
|
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="preprocessor">#endif</span></div>
|
|
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="comment"></span> </div>
|
|
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="comment"> /** Notice that in the loop above, we make sure that at the end of the loop,</span></div>
|
|
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="comment"> * ptr is pointing to the last digit. Thus we can avoid using another loop.</span></div>
|
|
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment"> **/</span></div>
|
|
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="comment">// ptr = &my_int;</span></div>
|
|
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="comment">// /* move ptr to the MSB digit */</span></div>
|
|
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="comment">// while (ptr->next_digit)</span></div>
|
|
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="comment">// ptr = ptr->next_digit;</span></div>
|
|
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="keywordflow">do</span></div>
|
|
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  {</div>
|
|
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  putchar(ptr->value + 0x30); <span class="comment">/* convert digit to ASCII char */</span></div>
|
|
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  ptr = ptr-><a class="code" href="../../dc/d77/struct__big__int.html#ad8405989a924410942b39ec0e9fef30b">prev_digit</a>;</div>
|
|
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  num_digits++;</div>
|
|
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  } <span class="keywordflow">while</span> (ptr); <span class="comment">/* after coming to units place, there will be no valid ptr */</span></div>
|
|
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  </div>
|
|
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  printf(<span class="stringliteral">"\nTime taken: %.4g millisecond\n"</span>,</div>
|
|
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  1e3 * (end_time - start_time) / CLOCKS_PER_SEC);</div>
|
|
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  printf(</div>
|
|
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="stringliteral">"Digit Sum = %lu\tNumber of digits = %lu\tStorage space = %.3gkb\t \n"</span>,</div>
|
|
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  sum_digits, num_digits, num_digits * <span class="keyword">sizeof</span>(<a class="code" href="../../dc/d77/struct__big__int.html">big_int</a>) / 1024.0);</div>
|
|
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  </div>
|
|
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <a class="code" href="../../db/d80/problem__20_2sol1_8c.html#a54a02c4b963fdb16f24959e0137763f1">remove_digits</a>((<a class="code" href="../../dc/d77/struct__big__int.html">big_int</a> *)ptr0, -1);</div>
|
|
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordflow">return</span> 0;</div>
|
|
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> }</div>
|
|
</div><!-- fragment --><div class="dynheader">
|
|
Here is the call graph for this function:</div>
|
|
<div class="dyncontent">
|
|
<div class="center"><iframe scrolling="no" frameborder="0" src="../../db/d80/problem__20_2sol1_8c_a3c04138a5bfe5d72780bb7e82a18e627_cgraph.svg" width="212" height="88"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe>
|
|
</div>
|
|
</div>
|
|
|
|
</div>
|
|
</div>
|
|
<a id="a54a02c4b963fdb16f24959e0137763f1"></a>
|
|
<h2 class="memtitle"><span class="permalink"><a href="#a54a02c4b963fdb16f24959e0137763f1">◆ </a></span>remove_digits()</h2>
|
|
|
|
<div class="memitem">
|
|
<div class="memproto">
|
|
<table class="memname">
|
|
<tr>
|
|
<td class="memname">char remove_digits </td>
|
|
<td>(</td>
|
|
<td class="paramtype"><a class="el" href="../../db/d80/problem__20_2sol1_8c.html#a62cbbd106aad52daadb9403a07d0da32">big_int</a> * </td>
|
|
<td class="paramname"><em>digit</em>, </td>
|
|
</tr>
|
|
<tr>
|
|
<td class="paramkey"></td>
|
|
<td></td>
|
|
<td class="paramtype">int </td>
|
|
<td class="paramname"><em>N</em> </td>
|
|
</tr>
|
|
<tr>
|
|
<td></td>
|
|
<td>)</td>
|
|
<td></td><td></td>
|
|
</tr>
|
|
</table>
|
|
</div><div class="memdoc">
|
|
<p>Function to remove digits preceeding the current digit. </p>
|
|
<div class="fragment"><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> {</div>
|
|
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">if</span> (digit == NULL)</div>
|
|
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">return</span> 0;</div>
|
|
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  </div>
|
|
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">if</span> (digit-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a> == NULL)</div>
|
|
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  {</div>
|
|
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  free(digit);</div>
|
|
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  digit = NULL;</div>
|
|
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">return</span> 0;</div>
|
|
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  }</div>
|
|
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  </div>
|
|
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">if</span> (<a class="code" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a> > 0)</div>
|
|
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">return</span> <a class="code" href="../../db/d80/problem__20_2sol1_8c.html#a54a02c4b963fdb16f24959e0137763f1">remove_digits</a>(digit-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a>, <a class="code" href="../../db/d01/problem__13_2sol1_8c.html#a0240ac851181b84ac374872dc5434ee4">N</a> - 1);</div>
|
|
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  </div>
|
|
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">return</span> <a class="code" href="../../db/d80/problem__20_2sol1_8c.html#a54a02c4b963fdb16f24959e0137763f1">remove_digits</a>(digit-><a class="code" href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">next_digit</a>, 0);</div>
|
|
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> }</div>
|
|
</div><!-- fragment -->
|
|
</div>
|
|
</div>
|
|
</div><!-- contents -->
|
|
</div><!-- doc-content -->
|
|
<div class="ttc" id="aproblem__20_2sol1_8c_html_a54a02c4b963fdb16f24959e0137763f1"><div class="ttname"><a href="../../db/d80/problem__20_2sol1_8c.html#a54a02c4b963fdb16f24959e0137763f1">remove_digits</a></div><div class="ttdeci">char remove_digits(big_int *digit, int N)</div><div class="ttdef"><b>Definition:</b> sol1.c:76</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="ttdef"><b>Definition:</b> sol1.c:109</div></div>
|
|
<div class="ttc" id="astruct__big__int_html_a187538b984c86d7cfdb13e297e7f3564"><div class="ttname"><a href="../../dc/d77/struct__big__int.html#a187538b984c86d7cfdb13e297e7f3564">_big_int::next_digit</a></div><div class="ttdeci">struct _big_int * next_digit</div><div class="ttdef"><b>Definition:</b> sol1.c:20</div></div>
|
|
<div class="ttc" id="astruct__big__int_html_ad8405989a924410942b39ec0e9fef30b"><div class="ttname"><a href="../../dc/d77/struct__big__int.html#ad8405989a924410942b39ec0e9fef30b">_big_int::prev_digit</a></div><div class="ttdeci">struct _big_int * prev_digit</div><div class="ttdef"><b>Definition:</b> sol1.c:21</div></div>
|
|
<div class="ttc" id="astruct__big__int_html"><div class="ttname"><a href="../../dc/d77/struct__big__int.html">_big_int</a></div><div class="ttdef"><b>Definition:</b> sol1.c:18</div></div>
|
|
<div class="ttc" id="aproblem__20_2sol1_8c_html_afc373c28da6b17636528edcc97fb5f86"><div class="ttname"><a href="../../db/d80/problem__20_2sol1_8c.html#afc373c28da6b17636528edcc97fb5f86">add_digit</a></div><div class="ttdeci">big_int * add_digit(big_int *digit, char value)</div><div class="ttdef"><b>Definition:</b> sol1.c:37</div></div>
|
|
<!-- start footer part -->
|
|
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
|
|
<ul>
|
|
<li class="navelem"><a class="el" href="../../dir_b3d331eabd4234f247030c297aaf021c.html">project_euler</a></li><li class="navelem"><a class="el" href="../../dir_4991c92e00761dd3d764efa2906b4318.html">problem_20</a></li><li class="navelem"><a class="el" href="../../db/d80/problem__20_2sol1_8c.html">sol1.c</a></li>
|
|
<li class="footer">Generated by
|
|
<a href="http://www.doxygen.org/index.html">
|
|
<img class="footer" src="../../doxygen.png" alt="doxygen"/></a> 1.8.18 </li>
|
|
</ul>
|
|
</div>
|
|
</body>
|
|
</html>
|