List of C functions

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The predefined functions used in the C standard library, and a few of the non-standard functions, include:

assert (macro)

cabs
cacos
cacosh
carg
Template:Dn
casinh
Template:Dn
catanh

ccos
ccosh
cexp
cimag
cis (non-standard)
Template:Dn
conj
cpow

cproj
creal
csin
csinh
csqrt
ctan
ctanh

digittoint (non-standard)
isalnum
isalpha
isascii (non-standard)
isblank
iscntrl

isdigit
isgraph
islower
isprint
ispunct
isspace

isupper
isxdigit
toascii (non-standard)
tolower
toupper

(no functions)
(no functions)

imaxabs
imaxdiv

strtoimax
strtoumax

wcstoimax
wcstoumax

(no functions)
(no functions)
localeconv
setlocale

acos
asin
atan
atan2
atof
ceil
cos
cosh

exp
fabs
floor
frexp
ldexp
log
log10

modf
pow
sin
sinh
sqrt
tan
tanh

getaddrinfo
getnameinfo
longjmp, setjmp
raise
va_arg (macro)
va_copy (macro)
va_end (macro)
va_start (macro)
offsetof (macro)

clearerr
fclose
feof
ferror
fflush
fgetc
fgetpos
fgets
fopen, freopen, fdopen (non-standard)
fprintf
fputc
fputs
fread

fscanf
fseek
fsetpos
ftell
fwrite
getc (macro)
getchar (macro)
gets
perror
printf, fprintf, sprintf, snprintf (non-standard)
putc (macro)
putchar, fputchar (non-standard) (macro)

puts
remove
rename
rewind
scanf, fscanf, sscanf, vfscanf (non-standard), vscanf, vsscanf
setbuf
setvbuf
tmpfile
tmpnam
ungetc
vprintf, vfprintf, vsprintf

abort
abs, labs
atexit
atof
atoi
atol
bsearch
div, ldiv

exit
free
itoa (non-standard)
getenv
ldiv
ltoa (non-standard)
malloc, calloc, and realloc
qsort

rand
srand
strtod
strtol
strtoul
system

memchr
memcmp
memcpy
memmove
memset
strcat, strncat
strchr

strcmp, strncmp
strcoll
strcpy, strncpy
strcspn
strerror
strlen
strpbrk

strrchr
strspn
strstr
strtok
strxfrm

asctime
clock
ctime
difftime
gmtime

localtime
mktime
strftime
time

btowc
fgetwc
fgetws
fputwc
fputws
fwide
fwprintf
fwscanf
getwc (macro)
getwchar (macro)
mbrlen
mbrtowc
mbsinit
mbsrtowcs
putwc (macro)
putwchar (macro)
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

iswalnum
iswalpha
iswcntrl
iswctype
iswdigit
iswgraph

iswlower
iswprint
iswpunct
iswspace
iswupper
iswxdigit

towctrans
towlower
towupper
wctrans
wctype

Non-standard headers

farmalloc
getch, getche, gotoxy
ru:Список функций стандартной библиотеки Си

uk:Перелік функцій стандартної бібліотеки С

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