| <html lang="en"> |
| <head> |
| <title>atoi - Untitled</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Untitled"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Stdlib.html#Stdlib" title="Stdlib"> |
| <link rel="prev" href="atof.html#atof" title="atof"> |
| <link rel="next" href="atoll.html#atoll" title="atoll"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="atoi"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="atoll.html#atoll">atoll</a>, |
| Previous: <a rel="previous" accesskey="p" href="atof.html#atof">atof</a>, |
| Up: <a rel="up" accesskey="u" href="Stdlib.html#Stdlib">Stdlib</a> |
| <hr> |
| </div> |
| |
| <h3 class="section">2.8 <code>atoi</code>, <code>atol</code>—string to integer</h3> |
| |
| <p><a name="index-atoi-10"></a><a name="index-atol-11"></a><a name="index-g_t_005fatoi_005fr-12"></a><a name="index-g_t_005fatol_005fr-13"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdlib.h> |
| int atoi(const char *<var>s</var>); |
| long atol(const char *<var>s</var>); |
| int _atoi_r(struct _reent *<var>ptr</var>, const char *<var>s</var>); |
| long _atol_r(struct _reent *<var>ptr</var>, const char *<var>s</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>atoi</code> converts the initial portion of a string to an <code>int</code>. |
| <code>atol</code> converts the initial portion of a string to a <code>long</code>. |
| |
| <p><code>atoi(s)</code> is implemented as <code>(int)strtol(s, NULL, 10).</code> |
| <code>atol(s)</code> is implemented as <code>strtol(s, NULL, 10).</code> |
| |
| <p><code>_atoi_r</code> and <code>_atol_r</code> are reentrant versions of <code>atoi</code> and |
| <code>atol</code> respectively, passing the reentrancy struct pointer. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The functions return the converted value, if any. If no conversion was |
| made, <code>0</code> is returned. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>atoi</code>, <code>atol</code> are ANSI. |
| |
| <p>No supporting OS subroutines are required. |
| |
| <p><br> |
| |
| </body></html> |
| |
