7/30/2019 ANSI C Reserved Words

1/17

ANSI C Reserved words:

only 32 keyword are there.

Standard ANSI C recognizes the followingkeywords:

auto

break

case

char

constcontinue

default

do

double

else

enum

extern

float

for

goto

if

int

long

register

return

7/30/2019 ANSI C Reserved Words

2/17

short

signed

sizeof

static

struct

switch

typedef

union

unsignedvoid

volatile

while

-------------------------

ok , i understood what r u saying.

u r right that when a header file is included,its function names cant be used as variables names.

but even then, they cant be regarded as keywords.

keywords r nearly 32 listed above.

there are numerous in-built functions in c, some of

them r listed here-

* assert.h

7/30/2019 ANSI C Reserved Words

3/17

assert (macro)

* complex.h

cabs

cacos

cacosh

carg

casin [disambiguation needed]casinh

catan [disambiguation needed]

catanh

ccos

ccosh

cexp

cimag

cis (non-standard)

clog [disambiguation needed]conj

cpow

7/30/2019 ANSI C Reserved Words

4/17

cproj

creal

csin

csinh

csqrt

ctan

ctanh

* ctype.h

digittoint (non-standard)

isalnum

isalphaisascii (non-standard)

isblank

iscntrl

isdigit

isgraph

islower

7/30/2019 ANSI C Reserved Words

5/17

isprint

ispunct

isspace

isupper

isxdigit

toascii (non-standard)tolower

toupper

* errno.h

(no functions)

* float.h

(no functions)

* inttypes.h

imaxabs

imaxdiv

7/30/2019 ANSI C Reserved Words

6/17

strtoimax

strtoumax

wcstoimaxwcstoumax

* iso646.h

(no functions)

* limits.h

(no functions)

* locale.h

localeconv

setlocale

7/30/2019 ANSI C Reserved Words

7/17

* math.h

acos

asin

atan

atan2

atof

ceil

coscosh

exp

fabsfloor

frexp

ldexp

log

log10

modf

7/30/2019 ANSI C Reserved Words

8/17

pow

sin

sinh

sqrt

tan

tanh

* setjmp.h

longjmp, setjmp

* signal.h

raise

* stdarg.h

va_arg (macro)

va_copy (macro)

va_end (macro)

va_start (macro)

* stddef.h

7/30/2019 ANSI C Reserved Words

9/17

offsetof (macro)

* stdio.h

clearerr

fclose

feof

ferror

fflushfgetc

fgetpos

fgets

fopen, freopen, fdopen (non-standard)

fprintf

fputcfputs

fread

fscanffseek

fsetpos

ftell

7/30/2019 ANSI C Reserved Words

10/17

fwrite

getc (macro)

getchar (macro)

gets

perror

printf, fprintf, sprintf, snprintf (non-standard)

putc (macro)

putchar, fputchar (non-standard) (macro)

puts

remove

rename

rewindscanf, fscanf, sscanf, vfscanf (non-standard), vscanf,

vsscanf

setbuf

setvbuf

tmpfile

tmpnamungetc

vprintf, vfprintf, vsprintf

7/30/2019 ANSI C Reserved Words

11/17

* stdlib.h

abort

abs, labs

atexit

atof

atoi

atol

bsearchdiv, ldiv

exit

freeitoa (non-standard)

getenv

ldiv

ltoa (non-standard)

malloc, calloc, and realloc

qsort

7/30/2019 ANSI C Reserved Words

12/17

rand

srand

strtod

strtol

strtoul

system

* string.h

memchr

memcmp

memcpy

memmove

memset

strcat, strncatstrchr

strcmp, strncmp

strcollstrcpy, strncpy

strcspn

strerror

7/30/2019 ANSI C Reserved Words

13/17

strlen

strpbrk

strrchr

strspn

strstr

strtokstrxfrm

* time.h

asctime

clockctime

difftime

gmtime

localtime

mktime

strftime

7/30/2019 ANSI C Reserved Words

14/17

time

* wchar.h

btowc

fgetwc

fgetws

fputwc

fputwsfwide

fwprintf

fwscanf

getwc (macro)

getwchar (macro)

mbrlenmbrtowc

mbsinit

mbsrtowcs

putwc (macro)

putwchar (macro)

swprintfswscanf

7/30/2019 ANSI C Reserved Words

15/17

ungetwc

vfwprintf

vswprintf

vwprintf

wcrtomb

wcscat

wcschr

wcscmpwcscoll

wcscpy

wcscspn

wcsftime

wcslen

wcsncatwcsncmp

wcsncpy

wcspbrk

wcsrchr

wcsrtombs

wcsspn

7/30/2019 ANSI C Reserved Words

16/17

wcsstr

wcstod

wcstok

wcstol

wcstoul

wcsxfrm

wctob

wmemchr

wmemcmpwmemcpy

wmemmove

wmemset

wprintf

wscanf

* wctype.h

iswalnum

iswalpha

iswcntrl

iswctypeiswdigit

iswgraph

7/30/2019 ANSI C Reserved Words

17/17

iswlower

iswprint

iswpunct

iswspace

iswupper

iswxdigit

towctrans

towlower

towupper

wctranswctype