codeblocks-ep/help/html/programmerHelp/cppreference.com/cppstring/copy.html at master · maifeeulasad/codeblocks-ep · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<!-- Mirrored from cppreference.com/cppstring/copy.html by HTTrack Website Copier/3.x [XR&CO'2004], Tue, 22 Jan 2008 06:24:52 GMT -->
<!-- Added by HTTrack --><meta http-equiv="content-type" content="text/html;charset=iso-8859-1"><!-- /Added by HTTrack -->
<head>
  <meta name="generator" content=
  "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org">

  <title>copy</title>
  <link href="../cppreference.css" rel="stylesheet" type="text/css">
  <link href="../prettify.css" type="text/css" rel="stylesheet" />
  <script type="text/javascript" src="../prettify.js"></script>
</head>

<body onload="prettyPrint()">
<table>
  <tr>
  <td>
  <div class="body-content">

  <div class="header-box">
    <a href="../index-2.html">cppreference.com</a> &gt; <a href=
    "index.html">C++ Strings</a> &gt; <a href="copy.html">copy</a>
  </div>

  <div class="name-format">
    copy
  </div>

  <div class="syntax-name-format">
    Syntax:
  </div>
  <pre class="syntax-box">
  #include &lt;string&gt;
  <strong>size_type</strong> copy( char* str, <strong>size_type</strong> num, <strong>size_type</strong> index = 0 );
</pre>

  <p>The copy() function copies <em>num</em> characters of the current
  string (starting at <em>index</em> if it&#39;s specified, 0
  otherwise) into <em>str</em>.</p>

  <p>The return value of copy() is the number of characters copied.</p>

  <p>For example, the following code uses copy() to extract a substring
  of a string into an array of characters:</p>
<pre class="prettyprint">
 char buf[30];
 memset( buf, &#39;\0&#39;, 30 );
 string str = &quot;Trying is the first step towards failure.&quot;;
 str.copy( buf, 24 );
 cout &lt;&lt; buf &lt;&lt; endl;
</pre>

  <p>When run, this code displays:</p>
<pre class="prettyprint">
 Trying is the first step
</pre>

  <p>Note that before calling copy(), we first call (Standard C String
  and Character) <a href="../stdstring/memset.html">memset</a>() to
  fill the destination array with copies of the <strong>NULL</strong>
  character. This step is included to make sure that the resulting
  array of characters is <strong>NULL</strong>-terminated.</p>

  <div class="related-name-format">
    Related topics:
  </div>

  <div class="related-content">
    <a href="substr.html">substr</a>
  </div>
  </div>
  </td>


<script src="../../www.google-analytics.com/urchin.js" type="text/javascript">
</script>
<script type="text/javascript">
_uacct = "UA-2828341-1";
urchinTracker();
</script>
  </tr>
  </table>
</body>
<!-- Mirrored from cppreference.com/cppstring/copy.html by HTTrack Website Copier/3.x [XR&CO'2004], Tue, 22 Jan 2008 06:24:52 GMT -->
<!-- Added by HTTrack --><meta http-equiv="content-type" content="text/html;charset=iso-8859-1"><!-- /Added by HTTrack -->
</html>