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<a name="Stdlib"></a>
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Next: <a href="Ctype.html#Ctype" accesskey="n" rel="next">Ctype</a>, Previous: <a href="Introduction.html#Introduction" accesskey="p" rel="prev">Introduction</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Standard-Utility-Functions-_0028stdlib_002eh_0029"></a>
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<h2 class="chapter">2 Standard Utility Functions (<samp>stdlib.h</samp>)</h2>
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<p>This chapter groups utility functions useful in a variety of programs.
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The corresponding declarations are in the header file <samp>stdlib.h</samp>.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="_005fExit.html#g_t_005fExit" accesskey="1">_Exit</a>:</td><td> </td><td align="left" valign="top">End program execution without cleaning up
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</td></tr>
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<tr><td align="left" valign="top">• <a href="abort.html#abort" accesskey="3">abort</a>:</td><td> </td><td align="left" valign="top">Abnormal termination of a program
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</td></tr>
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<tr><td align="left" valign="top">• <a href="abs.html#abs" accesskey="4">abs</a>:</td><td> </td><td align="left" valign="top">Integer absolute value (magnitude)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="assert.html#assert" accesskey="5">assert</a>:</td><td> </td><td align="left" valign="top">Macro for Debugging Diagnostics
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</td></tr>
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<tr><td align="left" valign="top">• <a href="atexit.html#atexit" accesskey="6">atexit</a>:</td><td> </td><td align="left" valign="top">Request execution of functions at program exit
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</td></tr>
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<tr><td align="left" valign="top">• <a href="atof.html#atof" accesskey="7">atof</a>:</td><td> </td><td align="left" valign="top">String to double or float
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</td></tr>
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<tr><td align="left" valign="top">• <a href="atoi.html#atoi" accesskey="8">atoi</a>:</td><td> </td><td align="left" valign="top">String to integer
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<tr><td align="left" valign="top">• <a href="atoll.html#atoll" accesskey="9">atoll</a>:</td><td> </td><td align="left" valign="top">String to long long
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<tr><td align="left" valign="top">• <a href="bsearch.html#bsearch">bsearch</a>:</td><td> </td><td align="left" valign="top">Binary search
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</td></tr>
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<tr><td align="left" valign="top">• <a href="calloc.html#calloc">calloc</a>:</td><td> </td><td align="left" valign="top">Allocate space for arrays
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</td></tr>
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<tr><td align="left" valign="top">• <a href="div.html#div">div</a>:</td><td> </td><td align="left" valign="top">Divide two integers
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</td></tr>
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<tr><td align="left" valign="top">• <a href="ecvtbuf.html#ecvtbuf">ecvtbuf</a>:</td><td> </td><td align="left" valign="top">Double or float to string of digits
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</td></tr>
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<tr><td align="left" valign="top">• <a href="ecvt.html#ecvt">ecvt</a>:</td><td> </td><td align="left" valign="top">Double or float to string of digits (malloc result)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="_005f_005fenv_005flock.html#g_t_005f_005fenv_005flock">__env_lock</a>:</td><td> </td><td align="left" valign="top">Lock environment list for getenv and setenv
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</td></tr>
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<tr><td align="left" valign="top">• <a href="gcvt.html#gcvt">gcvt</a>:</td><td> </td><td align="left" valign="top">Format double or float as string
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</td></tr>
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<tr><td align="left" valign="top">• <a href="exit.html#exit">exit</a>:</td><td> </td><td align="left" valign="top">End program execution
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</td></tr>
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<tr><td align="left" valign="top">• <a href="getenv.html#getenv">getenv</a>:</td><td> </td><td align="left" valign="top">Look up environment variable
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</td></tr>
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<tr><td align="left" valign="top">• <a href="itoa.html#itoa">itoa</a>:</td><td> </td><td align="left" valign="top">Integer to string
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</td></tr>
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<tr><td align="left" valign="top">• <a href="labs.html#labs">labs</a>:</td><td> </td><td align="left" valign="top">Long integer absolute value (magnitude)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="ldiv.html#ldiv">ldiv</a>:</td><td> </td><td align="left" valign="top">Divide two long integers
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</td></tr>
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<tr><td align="left" valign="top">• <a href="llabs.html#llabs">llabs</a>:</td><td> </td><td align="left" valign="top">Long long integer absolute value (magnitude)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="lldiv.html#lldiv">lldiv</a>:</td><td> </td><td align="left" valign="top">Divide two long long integers
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</td></tr>
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<tr><td align="left" valign="top">• <a href="malloc.html#malloc">malloc</a>:</td><td> </td><td align="left" valign="top">Allocate and manage memory (malloc, realloc, free)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="mallinfo.html#mallinfo">mallinfo</a>:</td><td> </td><td align="left" valign="top">Get information about allocated memory
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</td></tr>
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<tr><td align="left" valign="top">• <a href="_005f_005fmalloc_005flock.html#g_t_005f_005fmalloc_005flock">__malloc_lock</a>:</td><td> </td><td align="left" valign="top">Lock memory pool for malloc and free
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</td></tr>
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<tr><td align="left" valign="top">• <a href="mbsrtowcs.html#mbsrtowcs">mbsrtowcs</a>:</td><td> </td><td align="left" valign="top">Convert a character string to a wide-character string
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</td></tr>
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<tr><td align="left" valign="top">• <a href="mbstowcs.html#mbstowcs">mbstowcs</a>:</td><td> </td><td align="left" valign="top">Minimal multibyte string to wide string converter
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<tr><td align="left" valign="top">• <a href="mblen.html#mblen">mblen</a>:</td><td> </td><td align="left" valign="top">Minimal multibyte length
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</td></tr>
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<tr><td align="left" valign="top">• <a href="on_005fexit.html#on_005fexit">on_exit</a>:</td><td> </td><td align="left" valign="top">Request execution of functions at program exit
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</td></tr>
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<tr><td align="left" valign="top">• <a href="qsort.html#qsort">qsort</a>:</td><td> </td><td align="left" valign="top">Array sort
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</td></tr>
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<tr><td align="left" valign="top">• <a href="rand.html#rand">rand</a>:</td><td> </td><td align="left" valign="top">Pseudo-random numbers
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</td></tr>
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<tr><td align="left" valign="top">• <a href="random.html#random">random</a>:</td><td> </td><td align="left" valign="top">Pseudo-random numbers
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</td></tr>
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<tr><td align="left" valign="top">• <a href="rand48.html#rand48">rand48</a>:</td><td> </td><td align="left" valign="top">Uniformly distributed pseudo-random numbers
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</td></tr>
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<tr><td align="left" valign="top">• <a href="rpmatch.html#rpmatch">rpmatch</a>:</td><td> </td><td align="left" valign="top">Determine whether response is affirmative or negative
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</td></tr>
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<tr><td align="left" valign="top">• <a href="strtod.html#strtod">strtod</a>:</td><td> </td><td align="left" valign="top">String to double or float
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</td></tr>
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<tr><td align="left" valign="top">• <a href="strtol.html#strtol">strtol</a>:</td><td> </td><td align="left" valign="top">String to long
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</td></tr>
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<tr><td align="left" valign="top">• <a href="strtoll.html#strtoll">strtoll</a>:</td><td> </td><td align="left" valign="top">String to long long
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</td></tr>
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<tr><td align="left" valign="top">• <a href="strtoul.html#strtoul">strtoul</a>:</td><td> </td><td align="left" valign="top">String to unsigned long
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</td></tr>
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<tr><td align="left" valign="top">• <a href="strtoull.html#strtoull">strtoull</a>:</td><td> </td><td align="left" valign="top">String to unsigned long long
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</td></tr>
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<tr><td align="left" valign="top">• <a href="wcsrtombs.html#wcsrtombs">wcsrtombs</a>:</td><td> </td><td align="left" valign="top">Convert a wide-character string to a character string
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</td></tr>
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<tr><td align="left" valign="top">• <a href="wcstod.html#wcstod">wcstod</a>:</td><td> </td><td align="left" valign="top">Wide string to double or float
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</td></tr>
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<tr><td align="left" valign="top">• <a href="wcstol.html#wcstol">wcstol</a>:</td><td> </td><td align="left" valign="top">Wide string to long
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</td></tr>
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<tr><td align="left" valign="top">• <a href="wcstoll.html#wcstoll">wcstoll</a>:</td><td> </td><td align="left" valign="top">Wide string to long long
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</td></tr>
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<tr><td align="left" valign="top">• <a href="wcstoul.html#wcstoul">wcstoul</a>:</td><td> </td><td align="left" valign="top">Wide string to unsigned long
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</td></tr>
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<tr><td align="left" valign="top">• <a href="wcstoull.html#wcstoull">wcstoull</a>:</td><td> </td><td align="left" valign="top">Wide string to unsigned long long
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</td></tr>
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<tr><td align="left" valign="top">• <a href="system.html#system">system</a>:</td><td> </td><td align="left" valign="top">Execute command string
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</td></tr>
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<tr><td align="left" valign="top">• <a href="utoa.html#utoa">utoa</a>:</td><td> </td><td align="left" valign="top">Unsigned integer to string
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</td></tr>
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<tr><td align="left" valign="top">• <a href="wcstombs.html#wcstombs">wcstombs</a>:</td><td> </td><td align="left" valign="top">Minimal wide string to multibyte string converter
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</td></tr>
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<tr><td align="left" valign="top">• <a href="wctomb.html#wctomb">wctomb</a>:</td><td> </td><td align="left" valign="top">Minimal wide character to multibyte converter
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</td></tr>
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</table>
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Next: <a href="Ctype.html#Ctype" accesskey="n" rel="next">Ctype</a>, Previous: <a href="Introduction.html#Introduction" accesskey="p" rel="prev">Introduction</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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