The Standard Functions

This section describes all the standard functions in the ANSI-C library. Each function description consists of the subsections listed in the following table:

Some of the functions described in this chapter are unimplemented functions. Unimplemented functions are categorized in the following categories:

• Hardware specific
• File I/O

The following listed are the standard functions in the ANSI-C library:

• abort()
  
  
• abs()
  
  
• acos() and acosf()
  
  
• asctime()
  
  
• asin() and asinf()
  
  
• assert()
  
  
• atan() and atanf()
  
  
• atan2() and atan2f()
  
  
• atexit()
  
  
• atof()
  
  
• atoi()
  
  
• atol()
  
  
• bsearch()
  
  
• calloc()
  
  
• ceil() and ceilf()
  
  
• clearerr()
  
  
• clock()
  
  
• cos() and cosf()
  
  
• cosh() and coshf()
  
  
• ctime()
  
  
• difftime()
  
  
• div()
  
  
• exit()
  
  
• exp() and expf()
  
  
• fabs() and fabsf()
  
  
• fclose()
  
  
• feof()
  
  
• ferror()
  
  
• fflush()
  
  
• fgetc()
  
  
• fgetpos()
  
  
• fgets()
  
  
• floor() and floorf()
  
  
• fmod() and fmodf()
  
  
• fopen()
  
  
• fprintf()
  
  
• fputc()
  
  
• fputs()
  
  
• fread()
  
  
• free()
  
  
• freopen()
  
  
• frexp() and frexpf()
  
  
• fscanf()
  
  
• fseek()
  
  
• fsetpos()
  
  
• ftell()
  
  
• fwrite()
  
  
• getc()
  
  
• getchar()
  
  
• getenv()
  
  
• gets()
  
  
• gmtime()
  
  
• isalnum(), isalpha(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isupper(), and isxdigit()
  
  
• labs()
  
  
• ldexp() and ldexpf()
  
  
• ldiv()
  
  
• localeconv()
  
  
• localtime()
  
  
• log() and logf()
  
  
• log10() and log10f()
  
  
• longjmp()
  
  
• malloc()
  
  
• mblen()
  
  
• mbstowcs()
  
  
• mbtowc()
  
  
• memchr()
  
  
• memcmp()
  
  
• memcpy() and memmove()
  
  
• memset()
  
  
• mktime()
  
  
• modf() and modff()
  
  
• perror()
  
  
• pow() and powf()
  
  
• printf()
  
  
• putc()
  
  
• putchar()
  
  
• puts()
  
  
• qsort()
  
  
• raise()
  
  
• rand()
  
  
• realloc()
  
  
• remove()
  
  
• rename()
  
  
• rewind()
  
  
• scanf()
  
  
• setbuf()
  
  
• setjmp()
  
  
• setlocale()
  
  
• setvbuf()
  
  
• signal()
  
  
• sin() and sinf()
  
  
• sinh() and sinhf()
  
  
• sprintf()
  
  
• sqrt() and sqrtf()
  
  
• srand()
  
  
• sscanf()
  
  
• strcat()
  
  
• strchr()
  
  
• strcmp()
  
  
• strcoll()
  
  
• strcpy()
  
  
• strcspn()
  
  
• strerror()
  
  
• strftime()
  
  
• strlen()
  
  
• strncat()
  
  
• strncmp()
  
  
• strncpy()
  
  
• strpbrk()
  
  
• strrchr()
  
  
• strspn()
  
  
• strstr()
  
  
• strtod()
  
  
• strtok()
  
  
• strtol()
  
  
• strtoul()
  
  
• strxfrm()
  
  
• system()
  
  
• tan() and tanf()
  
  
• tanh() and tanhf()
  
  
• time()
  
  
• tmpfile()
  
  
• tmpnam()
  
  
• tolower()
  
  
• toupper()
  
  
• ungetc()
  
  
• va_arg(), va_end(), and va_start()
  
  
• vfprintf(), vprintf(), and vsprintf()
  
  
• wctomb()
  
  
• wcstombs()