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<h1>C Programming Language</h1> <p>The interface of C standard library is defined by the following collection of headers.</p>
<table class="t-dsc-begin"> <tr class="t-dsc"> <td> <a href="error" title="c/error"><code><assert.h></code></a> </td> <td> <a href="error" title="c/error">Conditionally compiled macro that compares its argument to zero</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="numeric/complex" title="c/numeric/complex"><code><complex.h></code></a> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> <td> <a href="numeric/complex" title="c/numeric/complex">Complex number arithmetic</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="string/byte" title="c/string/byte"><code><ctype.h></code></a> </td> <td> <a href="string/byte" title="c/string/byte">Functions to determine the type contained in character data</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="error" title="c/error"><code><errno.h></code></a> </td> <td> <a href="error" title="c/error">Macros reporting error conditions</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="numeric/fenv" title="c/numeric/fenv"><code><fenv.h></code></a> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> <td> <a href="numeric/fenv" title="c/numeric/fenv">Floating-point environment</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="types/limits#Limits_of_floating_point_types" title="c/types/limits"><code><float.h></code></a> </td> <td> <a href="types/limits#Limits_of_floating_point_types" title="c/types/limits">Limits of floating-point types</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="types/integer" title="c/types/integer"><code><inttypes.h></code></a> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> <td> <a href="types/integer" title="c/types/integer">Format conversion of integer types</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="language/operator_alternative" title="c/language/operator alternative"><code><iso646.h></code></a> <span class="t-mark-rev t-since-c95">(since C95)</span> </td> <td> <a href="language/operator_alternative" title="c/language/operator alternative">Alternative operator spellings</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="types/limits" title="c/types/limits"><code><limits.h></code></a> </td> <td> <a href="types/limits" title="c/types/limits">Ranges of integer types</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="locale" title="c/locale"><code><locale.h></code></a> </td> <td> <a href="locale" title="c/locale">Localization utilities</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="numeric/math" title="c/numeric/math"><code><math.h></code></a> </td> <td> <a href="numeric/math" title="c/numeric/math">Common mathematics functions</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="program" title="c/program"><code><setjmp.h></code></a> </td> <td> <a href="program" title="c/program">Nonlocal jumps</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="program" title="c/program"><code><signal.h></code></a> </td> <td> <a href="program" title="c/program">Signal handling</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="types" title="c/types"><code><stdalign.h></code></a> <span class="t-mark-rev t-since-c11">(since C11)</span> </td> <td> <a href="types" title="c/types"><code>alignas</code> and <code>alignof</code></a> convenience macros </td>
</tr> <tr class="t-dsc"> <td> <a href="variadic" title="c/variadic"><code><stdarg.h></code></a> </td> <td> <a href="variadic" title="c/variadic">Variable arguments</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="thread#Atomic_operations" title="c/thread"><code><stdatomic.h></code></a> <span class="t-mark-rev t-since-c11">(since C11)</span> </td> <td> <a href="thread#Atomic_operations" title="c/thread">Atomic operations</a> </td>
</tr> <tr class="t-dsc"> <td> <code><stdbit.h></code> <span class="t-mark-rev t-since-c23">(since C23)</span> </td> <td> Macros to work with the byte and bit representations of types </td>
</tr> <tr class="t-dsc"> <td> <a href="types" title="c/types"><code><stdbool.h></code></a> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> <td> <a href="types" title="c/types">Macros for boolean type</a> </td>
</tr> <tr class="t-dsc"> <td> <code><stdckdint.h></code> <span class="t-mark-rev t-since-c23">(since C23)</span> </td> <td> macros for performing checked integer arithmetic </td>
</tr> <tr class="t-dsc"> <td> <a href="types" title="c/types"><code><stddef.h></code></a> </td> <td> <a href="types" title="c/types">Common macro definitions</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="types/integer" title="c/types/integer"><code><stdint.h></code></a> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> <td> <a href="types/integer" title="c/types/integer">Fixed-width integer types</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="io" title="c/io"><code><stdio.h></code></a> </td> <td> <a href="io" title="c/io">Input/output</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="program" title="c/program"><code><stdlib.h></code></a> </td> <td> General utilities: <a href="memory" title="c/memory">memory management</a>, <a href="program" title="c/program">program utilities</a>, <a href="string" title="c/string">string conversions</a>, <a href="numeric/random" title="c/numeric/random">random numbers</a>, <a href="algorithm" title="c/algorithm">algorithms</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="language/_noreturn" title="c/language/ Noreturn"><code><stdnoreturn.h></code></a> <span class="t-mark-rev t-since-c11">(since C11)</span> </td> <td> <a href="language/_noreturn" title="c/language/ Noreturn"><code>noreturn</code></a> convenience macro </td>
</tr> <tr class="t-dsc"> <td> <a href="string/byte" title="c/string/byte"><code><string.h></code></a> </td> <td> <a href="string/byte" title="c/string/byte">String handling</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="numeric/tgmath" title="c/numeric/tgmath"><code><tgmath.h></code></a> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> <td> <a href="numeric/tgmath" title="c/numeric/tgmath">Type-generic math</a> (macros wrapping math.h and complex.h) </td>
</tr> <tr class="t-dsc"> <td> <a href="thread" title="c/thread"><code><threads.h></code></a> <span class="t-mark-rev t-since-c11">(since C11)</span> </td> <td> <a href="thread" title="c/thread">Thread library</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="chrono" title="c/chrono"><code><time.h></code></a> </td> <td> <a href="chrono" title="c/chrono">Time/date utilities</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="string/multibyte" title="c/string/multibyte"><code><uchar.h></code></a> <span class="t-mark-rev t-since-c11">(since C11)</span> </td> <td> <a href="string/multibyte" title="c/string/multibyte">UTF-16 and UTF-32 character utilities</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="string/wide" title="c/string/wide"><code><wchar.h></code></a> <span class="t-mark-rev t-since-c95">(since C95)</span> </td> <td> <a href="string/wide" title="c/string/wide">Extended multibyte and wide character utilities</a> </td>
</tr> <tr class="t-dsc"> <td> <a href="string/wide" title="c/string/wide"><code><wctype.h></code></a> <span class="t-mark-rev t-since-c95">(since C95)</span> </td> <td> <a href="string/wide" title="c/string/wide">Functions to determine the type contained in wide character data</a> </td>
</tr> </table> <h3 id="References"> References</h3> <ul>
<li> C23 standard (ISO/IEC 9899:2023): </li>
<ul><li> 7.1.2 Standard headers </li></ul>
<li> C17 standard (ISO/IEC 9899:2018): </li>
<ul><li> 7.1.2 Standard headers (p: 131-132) </li></ul>
<li> C11 standard (ISO/IEC 9899:2011): </li>
<ul><li> 7.1.2 Standard headers (p: 181-182) </li></ul>
<li> C99 standard (ISO/IEC 9899:1999): </li>
<ul><li> 7.1.2 Standard headers (p: 165) </li></ul>
<li> C89/C90 standard (ISO/IEC 9899:1990): </li>
<ul><li> 4.1.2 Standard headers </li></ul>
</ul> <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/header" title="cpp/header">C++ documentation</a></span> for <span class=""><span>C++ Standard Library header files</span></span> </td>
</tr> </table> <div class="_attribution">
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