List of C functions

From Wikipedia, the free encyclopedia

This page aims to alphabetically list all the predefined functions used in the C standard library, and a few of the non-standard functions.

• assert.h
  • (no functions)
• ctype.h
  • (non-standard) digittoint
  • isalnum
  • isalpha
  • (non-standard) isascii
  • (non-standard) isblank
  • iscntrl
  • isdigit
  • isgraph
  • islower
  • isprint
  • ispunct
  • isspace
  • isupper
  • isxdigit
  • (non-standard) toascii
  • tolower
  • toupper
• errno.h
  • (no functions)
• float.h
  • (no functions)
• limits.h
  • (no functions)
• locale.h
  • localeconv
  • setlocale
• math.h
  • acos
  • asin
  • atan
  • atan2
  • (non-standard) atof
  • ceil
  • cos
  • cosh
  • exp
  • fabs
  • floor
  • fmod
  • frexp
  • ldexp
  • log
  • log10
  • modf
  • pow
  • sin
  • sinh
  • sqrt
  • tan
  • tanh
• setjmp.h
  • longjmp, setjmp
• signal.h
  • raise
• stdarg.h
  • (no functions)
• stddef.h
  • offsetof
• stdio.h
  • clearerr
  • fclose
  • feof
  • ferror
  • fflush
  • fgetc
  • fgetpos
  • fgets
  • fopen, freopen, (non-standard) fdopen
  • fprintf
  • fputc
  • fputs
  • fread
  • fscanf
  • fseek
  • fsetpos
  • ftell
  • fwrite
  • getc
  • getchar
  • gets
  • perror
  • printf, fprintf, sprintf, (non-standard) snprintf
  • putc
  • putchar, (non-standard) fputchar
  • puts
  • remove
  • rename
  • rewind
  • scanf, fscanf, sscanf; (non-standard:) vfscanf, vscanf, vsscanf
  • setbuf
  • setvbuf
  • tmpfile
  • tmpnam
  • ungetc
  • vprintf, vfprintf, vsprintf
• stdlib.h
  • abort
  • abs, labs
  • atexit
  • atof
  • atoi
  • atol
  • bsearch
  • calloc
  • div, ldiv
  • exit
  • free
  • (non-standard) itoa
  • getenv
  • ldiv
  • (non-standard) ltoa
  • malloc, calloc, and realloc
  • qsort
  • rand
  • srand
  • strtod
  • strtol
  • strtoul
  • system
• string.h
  • memchr
  • memcmp
  • memcpy
  • memmove
  • memset
  • strcat, strncat
  • strchr
  • strcmp, strncmp
  • strcoll
  • strcpy, strncpy
  • strcspn
  • strerror
  • strlen
  • strpbrk
  • strrchr
  • strspn
  • strstr
  • strtok
  • strxfrm
• time.h
  • asctime
  • clock
  • ctime
  • difftime
  • gmtime
  • localtime
  • mktime
  • strftime
  • time

[edit] Non-standard headers

• alloc.h
  • farmalloc
• conio.h
  • getch, getche

C programming language
Libraries:	C standard library | glibc | Dietlibc | uClibc | Newlib
History:	Criticism of the C programming language
Language Features:	String | Syntax | Preprocessor | Variable types and declarations | Functions
Dialects:	C++ | Objective-C
C and Other Languages:	Compatibility of C and C++ | Operators in C and C++ | Comparison of Pascal and C | C to Java byte-code compiler