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    <a href="../index-2.html">cppreference.com</a> &gt; <a href=
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    append
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  <div class="syntax-name-format">
    Syntax:
  </div>
  <pre class="syntax-box">
  #include &lt;string&gt;
  string&amp; append( const string&amp; str );
  string&amp; append( const char* str );
  string&amp; append( const string&amp; str, <strong>size_type</strong> index, <strong>size_type</strong> len );
  string&amp; append( const char* str, <strong>size_type</strong> num );
  string&amp; append( <strong>size_type</strong> num, char ch );
  string&amp; append( <a href=
"../iterators.html">input_iterator</a> start, <a href=
"../iterators.html">input_iterator</a> end );
</pre>

  <p>The append() function either:</p>

  <ul>
    <li>appends <em>str</em> on to the end of the current string,</li>

    <li>appends a substring of <em>str</em> starting at <em>index</em>
    that is <em>len</em> characters long on to the end of the current
    string,</li>

    <li>appends <em>num</em> characters of <em>str</em> on to the end
    of the current string,</li>

    <li>appends <em>num</em> repititions of <em>ch</em> on to the end
    of the current string,</li>

    <li>or appends the sequence denoted by <em>start</em> and
    <em>end</em> on to the end of the current string.</li>
  </ul>

  <p>For example, the following code uses append() to add 10 copies of
  the &#39;!&#39; character to a string:</p>
<pre class="prettyprint">
   string str = &quot;Hello World&quot;;
   str.append( 10, &#39;!&#39; );
   cout &lt;&lt; str &lt;&lt; endl;
</pre>

  <p>That code displays:</p>
<pre class="prettyprint">
   Hello World!!!!!!!!!!
</pre>

  <p>In the next example, append() is used to concatenate a substring
  of one string onto another string:</p>
<pre class="prettyprint">
 string str1 = &quot;Eventually I stopped caring...&quot;;
 string str2 = &quot;but that was the &#39;80s so nobody noticed.&quot;;

 str1.append( str2, 25, 15 );
 cout &lt;&lt; &quot;str1 is &quot; &lt;&lt; str1 &lt;&lt; endl;
</pre>

  <p>When run, the above code displays:</p>
<pre class="prettyprint">
 str1 is Eventually I stopped caring...nobody noticed.
</pre>
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