C语言标准库
assert.h
ctype.h
isalnum()isalpha()iscntrl()isdigit()isgraph()islower()isprint()ispunct()isspace()isupper()isxdigit()tolower()toupper()
errno.h
locale.h
math.h
acosasinatanatan2coscoshsinsinhtanhexpfrexpldexploglog10modfpowsqrtceilfabsfloorfmod
setjmp.h
signal.h
stdarg.h
stddef.h
stdio.h
fcloseclearerrfeofferrorfflushfgetposfopenfreadfreopenfseekfsetposftellfwriteremoverenamerewindsetbufsetvbuftmpfiletmpnamfprintfprintfsprintfvfprintfvprintfvsprintffscanfscanfsscanffgetcfgetsfputcfputsgetcgetchargetsputcputcharputsungetcperror
stdlib.h
atofatoiatolstrtodstrtolstrtoulcallocfreemallocreallocabortatexitexitgetenvsystembsearchqsortabsdivlabsldivrandsrandmblenmbstowcsmbtowcwcstombswctomb
string.h
memchrmemcmpmemcpymemmovememsetstrcatstrncatstrchrstrcmpstrncmpstrcollstrcpystrncpystrcspnstrerrorstrlenstrpbrkstrrchrstrspnstrstrstrokstrxfrm
time.h