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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>  <meta name="generator" content=  "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org">  <title>sprintf</title>  <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table>  <tr>  <td>  <div class="body-content">  <div class="header-box">    <a href="../index.html">cppreference.com</a> &gt; <a href=    "index.html">Standard C I/O</a> &gt; <a href=    "sprintf.html">sprintf</a>  </div>  <div class="name-format">    sprintf  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;stdio.h&gt;  int sprintf( char *buffer, const char *format, ... );</pre>  <p>The sprintf() function is just like <a href=  "printf.html">printf</a>(), except that the output is sent to  <em>buffer</em>. The return value is the number of characters  written. For example:</p>  <pre class="example-code">   char string[50];   int file_number = 0;            sprintf( string, &quot;file.%d&quot;, file_number );   file_number++;   output_file = fopen( string, &quot;w&quot; );                </pre>  <p>Note that sprintf() does the opposite of a function like <a  href="../stdstring/atoi.html">atoi</a>() -- where <a href=  "../stdstring/atoi.html">atoi</a>() converts a string into a number,  sprintf() can be used to convert a number into a string.</p>  <p>For example, the following code uses sprintf() to convert an  integer into a string of characters:</p>  <pre class="example-code">   char result[100];   int num = 24;   sprintf( result, &quot;%d&quot;, num );              </pre>  <p>This code is similar, except that it converts a floating-point  number into an array of characters:</p>  <pre class="example-code">   char result[100];   float fnum = 3.14159;   sprintf( result, &quot;%f&quot;, fnum );</pre>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    (Standard C String and Character) <a href=    "../stdstring/atof.html">atof</a><br>    (Standard C String and Character) <a href=    "../stdstring/atoi.html">atoi</a><br>    (Standard C String and Character) <a href=    "../stdstring/atol.html">atol</a><br>    <a href="fprintf.html">fprintf</a><br>    <a href="printf.html">printf</a>  </div>  </div>  </td>    </tr>  </table></body></html>
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