C programming/Standard library reference

Headers ANSI C (C89)/ISO C (C90) assert.h Verify program assertion filectype.h Character types file.errno.h System error numbers filefloat.h Floating types filelimits.h Implementation-defined constants file.locale.h Category macros file.math.h Mathematical declarations file.setjmp.h Stack environment declarations file.signal.h Signals file.stdarg.h Handle variable argument list file.stddef.h Standard type definitions file.stdio.h Standard buffered input/output file.stdlib.h Standard library definitions file.string.h String operations file.time.h Time types file. ISO C (C94/C95), Amendment 1 (AMD1) Very old compilers may not include some or all of these headers iso646.h Alternative spellings.wchar.h Wide-character handling.wctype.h Wide-character classification and mapping utilities. ISO C (C99) These are supported only in newer compilers complex.h Complex arithmetic.fenv.h Floating-point environment.inttypes.h Fixed size integer types.stdbool.h Boolean type and values.stdint.h Integer types.tgmath.h Type-generic macros. ISO C (C11) These are supported only in newer compilers stdalign.h Alignment keywords and macros.stdatomic.h Atomic operations on data shared between threads.stdnoreturn.h _Noreturn function specifier macro.threads.h Support for multiple threads of execution.uchar.h Types and functions for manipulating Unicode characters. Table of functions This table also includes function-like macros assert.h assert complex.h cacos cacosf cacosl casin casinf casinl catan catanf catanl ccos ccosf ccosl csin csinf csinl ctan ctanf ctanl cacosh cacoshf cacoshl casinh casinhf casinhl catanh catanhf catanhl ccosh ccoshf ccoshl csinh csinhf csinhl ctanh ctanhf ctanhl cexp cexpf cexpl clog clogf clogl cabs cabsf cabsl cpow cpowf cpowl csqrt csqrtf csqrtl carg cargf cargl cimag cimagf cimagl conj conjf conjl cproj cprojf cprojl creal crealf creall ctype.h isalnum isalpha isblank iscntrl isdigit isgraph islower isprint ispunct isspace isupper isxdigit tolower toupper fenv.h feclearexcept fegetenv fegetexceptflag fegetround feholdexcept feraiseexcept fesetenv fesetexceptflag fesetround fetestexcept feupdateenv inttypes.h imaxabs imaxdiv strtoimax strtoumax wcstoimax wcstoumax locale.h localeconv setlocale math.h fpclassify isfinite isgreater isgreaterequal isinf isless islessequal islessgreater isnan isnormal isunordered signbit setjmp.h longjmp setjmp signal.h raise stdarg.h va_arg va_copy va_end va_start stdatomic.h atomic_init atomic_thread_fence atomic_signal_fence atomic_is_lock_free atomic_store atomic_store_explicit atomic_load atomic_load_explicit atomic_exchange atomic_exchange_explicit atomic_compare_exchange_strong atomic_compare_exchange_strong_explicit atomic_compare_exchange_weak atomic_compare_exchange_weak_explicit atomic_fetch atomic_fetch_key_explicit atomic_flag_test_and_set atomic_flag_test_and_set_explicit atomic_flag_clear atomic_flag_clear_explicit stddef.h offsetof stdio.h clearerr fclose feof fgetc fgetpos fgets fopen fprintf fputs fread fscanf fseek fsetpos ftell fwprintf fwrite getc getchar gets perror printf putc putchar puts remove rename rewind scanf setbuf setvbuf sprintf tmpfile ungetc vwprintf wprintf wscanf stdlib.h abort abs labs atexit atof atoi atol bsearch div ldiv exit free getenv malloc calloc realloc qsort rand srand strtod strtol strtoul system string.h memchr memcmp memcpy memmove mempcpy memset strcat strncat strchr strcmp strncmp strcoll strcpy strncpy strcspn strerror strlen strpbrk strrchr strspn strstr strtok strxfrm threads.h call_once cnd_broadcast cnd_destroy cnd_init cnd_signal cnd_timedwait cnd_wait mtx_destroy mtx_init mtx_lock mtx_timedlock mtx_trylock mtx_unlock thrd_create thrd_current thrd_detach thrd_equal thrd_exit thrd_join thrd_sleep thrd_yield tss_create tss_delete tss_get tss_set time.h asctime clock ctime difftime gmtime localtime mktime strftime time uchar.h mbrtoc16 c16rtomb mbrtoc32 c32rtomb wchar.h btowc fgetwc fgetws fputwc fwide fwprintf fwscanf getwc getwchar mbrlen mbrtowc mbsinit mbsrtowcs putwc putwchar swprintf swscanf ungetwc vfwprintf vswprintf vwprintf wcrtomb wcscat wcschr wcscmp wcscoll wcscpy wcscspn wcsftime wcslen wcsncat wcsncmp wcsncpy wcspbrk wcsrchr wcsrtombs wcsspn wcsstr wcstod wcstok wcstol wcstoul wcsxfrm wctob wmemchr wmemcmp wmemcpy wmemmove wmemset wprintf wscanf wctype.h iswalnum iswalpha iswcntrl iswctype iswdigit iswgraph iswlower iswprint iswpunct iswspace iswupper iswxdigit towctrans towlower towupper wctrans wctype