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abort() Abort Process and Return Error
abs() Calculate Absolute Value of Integer
access() Check File Permission Setting
acos() Calculate Arc Cosine
alloca() Allocate Memory Block on Stack
asctime() Converts Time from Structure to String
asin() Calculate Arc Sine
assert() Diagnostic Message Generator
atan() Calculate Arc Tangent
atan2() Calculate Arc Tangent of y/x
atof() Convert String to Double
atoi() Convert String to Integer
atol() Convert String to Long
bdos() Invoke DOS Function, Short Form
bessel() Return Result of a Bessel Function of x
bsearch() Performs Binary Search
cabs() Calculate Absolute Value of Complex Number
calloc() Allocate and Zero Memory
ceil() Calculate Ceiling of Value
cgets() Get a Character String From the Console
chdir() Change Current Working Directory
chmod() Change File Permission Setting
chsize() Change Size of File
_clear87() Get and Clear 8087/80287 Status Word
clearerr() Clear Error Indicator for a Stream
close() Close File
_control87() Get and Set 8087/80287 Status Word
cos() Calculate Cosine
cosh() Calculate Hyperbolic Cosine
cprintf() Formatted Write to Console
cputs() Write a String to the Console
creat() Create a New File
cscanf() Read Formatted Data from Console
ctime() Convert Time from Long Integer to String
dieeetomsbin() Convert IEEE Double to MS Binary Double
dmsbintoieee() Convert Double MS Binary to IEEE Double
difftime() Find the Difference between Two Times
dosexterr() Get DOS Extended Error Values
dup() Create Second Handle for Open File
dup2() Reassign a File Handle
ecvt() Convert Double to String
eof() Test for End of File
exec...() An Overview of the Eight Exec Functions
execl() Execute Program Using: Arg List
execle() Execute Program Using: Arg List, Environment
execlp() Execute Program Using: Arg List, PATH
execlpe() Execute Program Using: Arg List, PATH, Environment
execv() Execute Program Using: Arg Array
execve() Execute Program Using: Arg Array, Environment
execvp() Execute Program Using: Arg Array, PATH
execvpe() Execute Program Using: Arg Array, PATH, Environment
exit() Terminate Process after Cleanup
_exit() Terminate Process without Cleanup
exp() Calculate Exponential
_expand() Change Size of Allocated Memory Block
fabs() Calculate Absolute Value of Floating Point
fclose() Close a Stream
fcloseall() Close All Open Streams
fcvt() Convert Double to String
fdopen() Open a Stream Using a Handle
feof() Detect Stream End-of-File (Macro)
ferror() Test for Error on a Stream (Macro)
fflush() Flush a Stream
_ffree() Deallocate Far Memory Block
fgetc() Read a Character from a Stream
fgetchar() Read a Character from Stdin
fgets() Read a String from Stream
fieeetomsbin() Convert IEEE Single-Precision to MS Binary
fmsbintoieee() Convert MS Binary Single-Precision to IEEE
filelength() Return File Length
fileno() Get File Handle Associated with Stream (Macro)
floor() Calculate Floor of Value
flushall() Flush All Streams and Clear All Buffers
_fmalloc() Allocate Far Memory Block
fmod() Calculate Floating-Point Remainder
_fmsize() Return Size of Far Memory Block
fopen() Open a File
FP_OFF() Get or Set Offset Portion of a Far Pointer (Macro)
FP_SEG() Get or Set Segment Portion of a Far Pointer (Macro)
_fpreset() Reinitialize Floating-Point Math Package
fprintf() Write Formatted Data to Stream
fputc() Write a Character to a Stream
fputchar() Write a Character to Stdout
fputs() Write a String to Stream
fread() Read Unformatted Data from Stream
free() Deallocate Memory Block
_freect() Return Size of Memory as Number of Items
freopen() Reassign a File Pointer
frexp() Get Mantissa and Exponent of Floating-Point Value
fscanf() Read Formatted Data from Screen
fseek() Reposition File Pointer to Given Location
fstat() Get Information about Open File
ftell() Get Current File Pointer Position
ftime() Get Current System Time as Structure
fwrite() Write Unformatted Data to Stream
gcvt() Convert Double to String
getc() Read a Character from a Stream (Macro)
getchar() Read a Character from 'Stdin'
getch() Get a Character from the Console without Echo
getche() Get a Character from Console with Echo
getcwd() Get Path Name of Current Working Directory
getenv() Get a Value from the Environment Table
getpid() Get Process ID
gets() Read a Line from 'Stdin'
getw() Read an Integer from a Stream
gmtime() Convert Time from Long Integer to Structure
halloc() Allocate and Zero Huge Memory Block
hfree() Deallocate Huge Memory Block
hypot() Calculate the Hypotenuse of a Right Triangle
inp() Read a Byte from the Specified Port
int86() Execute 8086 Software Interrupt
int86x() Set Segment Registers and Execute Software Interrupt
intdos() Invoke DOS Function, Long Form
intdosx() Set Seg Regs and Invoke DOS Function, Long Form
isalnum() Test for Alphanumeric Character (Macro)
isalpha() Test for Alphabetic Character (Macro)
isascii() Test for ASCII Character (Macro)
isatty() Check for Character Device
iscntrl() Test for Control Character
isdigit() Test for Digit
isgraph() Test for Printable Character Except Space
islower() Test for Lowercase
isprint() Test for Printable Character
ispunct() Test for Punctuation Character
isspace() Test for White-Space Character
isupper() Test for Uppercase
isxdigit() Test for Hexadecimal Digit
itoa() Convert Integer to String
kbhit() Check Keyboard Input Buffer for Character Waiting
labs() Calculate Absolute Value of Long Integer
ldexp() Convert Mantissa and Exponent to Floating Point
lfind() Linear Search for Key
lsearch() Linear Search for Key; Add Key If Not Found
localtime() Convert Time from Int to Structure--Local Correction
locking() Lock Areas of File
log() Calculate Natural Logarithm
log10() Calculate Base 10 Logarithm
longjmp() Restore Program State
lseek() Reposition File Pointer to Specified Location
ltoa() Convert Long to String
malloc() Allocate Memory Block
matherr() Handle Math Error
_memavl() Return Size of Memory Available
memccpy() Copy Characters from Buffer
memchr() Find Character in Buffer
memcmp() Compare Characters from Two Buffers
memcpy() Copy Characters between Buffers
memicmp() Compare Characters in Two Buffers
memset() Initialize Buffer
mkdir() Create a New Directory
mktemp() Create a Unique File Name
modf() Split Floating Point into Mantissa and Exponent
movedata() Copy Characters to a Different Segment
_msize() Return Size of Memory Block
_nfree() Deallocate Near Memory Block
_nmalloc() Allocate Near Memory Block
_nmsize() Return Size of Near Memory Block
onexit() Register Terminating Function
open() Open a File
outp() Write a Byte to the Specified Port
perror() Print Error Message
pow() Calculate X Raised to the Yth Power
printf() Write Formatted String to Stdout
putc() Write a Character to Stream
putchar() Write a Character to Stdout
putch() Write a Character to the Console
putenv() Create New Environment Variables
puts() Write String to Stdout
putw() Write an Integer to Stream
qsort() Perform Quick Sort
rand() Get Pseudorandom Integer
read() Read Data from File
realloc() Reallocate Memory Block
remove() Delete A File
rename() Rename a File or Directory
rewind() Reposition File Pointer to Beginning of Stream
rmdir() Remove a Directory
rmtmp() Remove Temporary File Created by tempfile()
sbrk() Reset Break Value for Calling Process
scanf() Read Formatted Data from Stdin
segread() Return Current Values of Segment Registers
setbuf() Control Stream Buffering
setjmp() Save Program State
setmode() Set File-Translation Mode
setvbuf() Control Stream Buffering and Buffer Size
signal() Set Interrupt Signal Handling
sin() Calculate Sine
sinh() Calculate Hyperbolic Sine
sopen() Open A File for File Sharing
spawn...() An Overview of the Eight Spawn Functions
spawnl() Execute Program Using: Arg List
spawnle() Execute Program Using: Arg List, Environment
spawnlp() Execute Program Using Arg List, PATH
spawnlpe() Execute Program Using Arg List, PATH, Environment
spawnv() Execute Program Using Arg Array
spawnve() Execute Program Using Arg Array, Environment
spawnvp() Execute Program Using Arg Array, PATH
spawnvpe() Execute Program Using Arg Array, PATH, Environment
sprintf() Write Formatted Data to String
sqrt() Calculate Square Root
srand() Set Random Starting Point
sscanf() Read Formatted Data from String
stackavail() Return Size of Available Stack Memory
stat() Get File-Status Information on Named File
_status87() Get 8087/80287 Floating-Point Status Word
strcat() Append a String
strchr() Find a Character in a String
strcmp() Compare Two Strings, Case Sensitive
strcmpi() Compare Two Strings, Case Insensitive
stricmp() Compare Two Strings, Case Insensitive
strcpy() Copy One String to Another
strcspn() Scan One String for Another
strdup() Duplicate String
strerror() Save System Error Message
strlen() Get String Length
strlwr() Convert String to Lower Case
strncat() Append Specified Number of Characters to a String
strncmp() Compare n Characters of Two Strings, Case Sensitive
strnicmp() Compare n Characters of Strings, Case Insensitive
strncpy() Copy a Specified Number of Characters
strnset() Initialize n Characters of String
strpbrk() Scan String for Character from Character Set
strrchr() Scan String for Last Occurrence of Character
strrev() Reverse Characters in String
strset() Set All Characters in String
strspn() Find First Substring
strstr() Find Substring
strtod() Convert String to Double
strtol() Convert String to Long Decimal Integer
strtok() Finds Next Token in String
strupr() Convert String to Uppercase
swab() Swap Bytes
system() Execute DOS Command
tan() Calculate Tangent
tanh() Calculate Hyperbolic Tangent
tell() Get Current File Pointer Position
tempnam() Generate a Temporary File Name in Given Directory
time() Get Current System Time as Long Integer
tmpfile() Create a Temporary File
tmpnam() Generate a Temporary File Name
toascii() Convert 'c' to ASCII Character
tolower() Convert 'c' To Lowercase, If Appropriate
_tolower() Convert 'c' to Lowercase
toupper() Convert 'c' to Uppercase, If Appropriate
_toupper() Convert 'c' to Uppercase
tzset() Set External Time Variables, Environment Variables
ultoa() Convert Unsigned Long to String
umask() Set Default Permission Mask
ungetc() Push Character Back onto the Stream
ungetch() Push Back the Last Character Read from the Console
unlink() Delete a File
utime() Set File-Modification Time
va_arg() Access Variable Number of Arguments, UNIX V Style
va_arg() Access Variable Number of Arguments, ANSI C Style
vfprintf() Write Formatted Data to Stream
vprintf() Write Formatted Data to Stdout
vsprintf() Write Formatted Data to String
write() Write Data to a File
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