List of C functions

1. From Wikipedia, the free encyclopedia

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

2. assert.h

3. assert (macro)

4. complex.h

5. cabs cacos cacosh carg casin [disambiguation needed] casinh catan [disambiguation needed] catanh

   ccos ccosh cexp cimag cis (non-standard) clog [disambiguation needed] conj cpow

   cproj creal csin csinh csqrt ctan ctanh

6. ctype.h

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

   isdigit isgraph islower isprint ispunct isspace

   isupper isxdigit toascii (non-standard) tolower toupper

8. errno.h

9. (no functions)

10. float.h

11. (no functions)

12. inttypes.h

13. imaxabs imaxdiv

    strtoimax strtoumax

    wcstoimax wcstoumax

14. iso646.h

15. (no functions)

16. limits.h

17. (no functions)

18. locale.h

19. localeconv

    setlocale

20. math.h

21. acos asin atan atan2 atof ceil cos cosh

    exp fabs floor frexp ldexp log log10

    modf pow sin sinh sqrt tan tanh

22. setjmp.h

23. longjmp, setjmp

24. signal.h

25. raise

26. stdarg.h

27. va_arg (macro)

    va_copy (macro)

    va_end (macro)

    va_start (macro)

28. stddef.h

29. offsetof (macro)

30. stdio.h

31. 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

32. stdlib.h

33. 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

34. string.h

35. memchr memcmp memcpy memmove memset strcat, strncat strchr

    strcmp, strncmp strcoll strcpy, strncpy strcspn strerror strlen strpbrk

    strrchr strspn strstr strtok strxfrm

36. time.h

37. asctime clock ctime difftime gmtime

    localtime mktime strftime time

38. wchar.h

39. 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

40. wctype.h

41. iswalnum iswalpha iswcntrl iswctype iswdigit iswgraph

    iswlower iswprint iswpunct iswspace iswupper iswxdigit

    towctrans towlower towupper wctrans wctype

    [edit]Non-standard headers

42. alloc.h

43. farmalloc

44. conio.h

45. getch, getche, gotoxy

46. netdb.h

47. getaddrinfo

    getnameinfo

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