This is an index into the C Programming Reference Guide. It is probably not complete. If you dont find something in here - don't give up, try another route and if you find it, let me know and I will add it to this index.

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? % format identifer.  % Operator (modulo).  + Operator (addition).  - Operator (Subtraction).  / Operator (division).  /* Open a comment.  // Inline comment (C++). * Operator (Multiplication).  * width/percision formating character.  * Pointer operator (Unary).  */ Close a comment.  -- Operator (decrement).  ++ Operator (increment).  = Operator (Assignment, Equals).  *= Operator.  /= Operator.  %= Operator. += Operator.  -= Operator.  <<= Operator. >>= Operator. &= Operator.  ^= Operator.	? continued |= Operator. == Operator.  != Operator.  > Operator.  < Operator. >= Operator. <= Operator.  && Operator.  || Operator.  ! Operator.  & Reference Variables (C++). & Bitwise AND Operator (binary).  | Bitwise OR Operator (binary).  ^ Operator.  << Shift Left Operator.  >> Shift Right Operator.  ~ Operator.  & Address of Operator (Unary).  ? Operator.  : Operator.  :: Scope Resolution (C++). . Operator (structure member).  -> Operator (structure pointer).  ... in function declarations.  , Comma Operator.
# #include preprocessor  #define preprocessor  #if preprocessor  #ifdef preprocessor  #ifndef preprocessor  #line preprocessor	# continued #undef preprocessor  #pragma preprocessor  #else preprocessor  #error preprocessor  #elif preprocessor  #endif preprocessor
A abort a program.  abs function. Aboslute value of an integer.  acos function.  AND Operator.  ANSI Standard headers.  Archive libraries.  ARGC and ARGV[].  Arithmetic Operators  Arrays  Arrarys of Structures.  Array sorting  Assignment Operators	A continued Ascii table.  asctime function  asin function.  assert function.  Assignment Constructors C++ class atan function.  atan function.  atexit Execute the named function when the program terminates.  atof  atoi Accepts +-0123456789 leading blanks and converts to integer.  atol  Audible Alert \a  auto keyword.
B Backspace \b  Base conversion.  basename strip directory information from a file name.  Bell \a  Binary formating problem.  Bits.  Bitwise Operators	B continued Book list.  boolean.  bool datatype (C++).  break keyword.  bsearch function.  Bytes.
C Carriage Return \r  case keyword.  cast  ceil function.  Change working directory.  close function.  closedir function.  %c Character formatting (printf, scanf etc)  char keyword.  Character arrays  Character Constants.  Character I/P & O/P in files. chdir function.  class C++ keyword  class Inheritance(C++) class keyword (C++) clock function.  clrscr Clear screen  clrscr Program to clear the screen using VT escape sequence. Coding idioms.  Comma operator.	C continued Command line arguments.  C Comments.  Comments in C++.  Comman coding errors.  Compare strings.  Compare strings ignoring case.  Compilers.  Compiler Error messages (GCC).  Completion codes.  Concatenate strings.  const keyword. const keyword. In classes Constants. constructors C++ class continue keyword.  Conversion table between ASCII Binary, Decimal, Hex  Convert Unix file to DOS format.  Convert Unix path names to DOS path names..  Copy Constructors C++ class Copy strings.  Copy a file.  Create Environmental variables.  ctime function
D __DATE__ Predefined macro Data types.  Data type conversion.  Date functions.  %d Decimal formatting (printf, scanf etc)  Declaration  Debugging  Decimal Ascii table.  Decrementing. Default Constructors C++ class Default Parameter values. (C++) default keyword.  #define Preprocessor  Definition	D continued delete C++.  Destructors C++ class difftime function.  Directory access functions.  Directory information stipped from a file name.  do keyword.  Domain name.  double keyword.  Download the source.  dup duplicate a file descriptor.  dup2 duplicate a file descriptor.  dynamically allocate memory.  dynamic libraries.
E %e formatting (printf, scanf etc)  #elif preprocessor  #else preprocessor  else keyword.  #edif preprocessor  editors to write your programs with.  endpwent function.  enum keyword.  enum. C++ changes. environ example.  errno.h ANSI header.  #error preprocessor  escape codes.  Environmental variables.  Evaluation of operators.	E continued Example programs.  execl function.  execlp function.  execle function.  exect function.  execv function.  execvp function.  exit function.  Expressions.  extern keyword.
F __FILE__ Predefined macro File descriptor  %f formatting (printf, scanf etc)  fabs function.  FALSE.  fclose Close a file.  feof Check for EOF while reading a file.  fflush function. Clear an input or output stream. fgetc Read a character from a file.  fgetpwent function.  fgets  field width. (printf, scanf etc)  File status, permissions, ownership etc.  Float arrays  float keyword.  float.h ANSI header.  Floating point Constants.  floor function.	F continued fopen Open a file  format flags. (printf, scanf etc)  fork a child process. Formfeed \f Read a record from a file (safer than fgetc).  for keyword  formatting (printf, scanf etc)  fprintf O/P a line of data to a file.  fputc Write a character to a file. friend C++ keyword. free function to release memory allocated with malloc.  fputs Write a string to a file.  fstat File status, permissions, ownership etc.  functions writing.  functions ANSI library.  Function Overloading. (C++) Functions (pointers to).  Functions (static).  static functions in C++.
G %g formatting (printf, scanf etc)  GDB debugger  getenv Get an environmental variable.  getchar Get a character from the keyboard (STDIN).  getc Get a character from an input stream.  getch function.  getche function.  geteuid function. Get a Users effective ID.  gethostname function. Get the name of this host!  getopt function. Parse the command line.	G continued getpid function. Get the process id.  getppid function. Get the parent process id.  getpw function.  getpwent function.  getpwnam Get a record from /etc/passwd by keying on the user name.  getpwuid Get a record from /etc/passwd by keying on the UID.  gets function. Get string (from keyboard).  getuid function. Get a Users real ID.  Global variables.  Glossary (C)  Glossary (C++)  gmtime function  goto keyword.  Got Ya! Comman coding errors.   GREP command for DOS users.  Group ID.
H Headers (standard).  Hex base conversion.  Hex dump program.  Hex table.	H continued Hex Character constant \x  Hex Constant notation '0x56' Hex formatting (printf, scanf etc)  Horizontal tab \t  Host name via the  uname function.  Host name via the  gethostname function.
I %i Decimal formatting (printf, scanf etc)  Idioms.  Incrementing.  #include Preprocessor  #if preprocessor  #ifdef preprocessor  #ifndef preprocessor  if keyword.  index Search for a character in a string.  Initialise a structure.. inline C++ keyword. Inheritance (C++) input from the keyboard  int keyword.  Integer arrays  Integer Constants.  integer formatting.  I/O.	I continued input from the keyboard  int keyword.  Integer arrays  Integer Constants.  integer formatting.  I/O.  isalnum Checks whether a character is alphanumeric (A-Z, a-z, 0-9)  iscntrl Checks whether a character is a control character or delete ( decimal 0-31 and 127)  isdigit Checks whether a character is a digit (0-9)  isgraph Checks whether a character is a printable character, excluding the space (decimal 32)  islower Checks whether a character is a lower case letter (a-z).  isprint Checks whether a character is printable (decimal 32-126).  ispunct Checks whether a character is punctuation (decimal 32-47, 58-63, 91-96, 123-126)  isspace Checks whether a character is white space - space, CR HT VT NL, FF.  isupper Checks whether a character is an upper case letter (A-Z).  isxdigit Checks whether a character is hex digit (0-9, A-F, a-f).
J	J continued
K keyboard input.  Keywords.  Keywords added to C++  kill a process.	K continued
L __LINE__ Predefined macro labs function.  libraries (user)  limits.h ANSI header.  #line preprocessor  Linked lists  locale.h ANSI header.  Local variables.  localtime function.	L continued Logical AND Operator.  Logical OR Operator.  long keyword.  setjmp.h ANSI header.  Love Tim Love's C programming documentation.  Low level I/O.  Lowercase to uppercase character conversion.  lstat function. Get file status, permissions, ownership etc.
M Macros  Machine type.  main() function. malloc function to dynamically allocate memory.  math.h.  member of a structure.  memchr function.  memcmp function.	M continued memcpy function.  memove function.  memset function.  mkdir function.  mktime function.  Mirror sites.  modulo.  Modifiers.  Multi-dimensional arrarys.
N %n formatting (printf, scanf etc)  namespace C++ keyword. new C++. Newline \n  NOT Operator.  Null.  Number base conversion.  Number base converter.  Nutshell book examples.	N continued
O %o Octal formatting (printf, scanf etc)  \o Octal Character constant  open function.  opendir function.  operator C++ keyword. Operators Operator  Precedence.  Operand definition.  OR Operator.  O'Reilly books.	O continued Overloading Functions. (C++)
P %p formatting (printf, scanf etc)  password functions.  pclose Close a pipe.  perl in C code.  pipe function.  Pointers  Pointers to arrays.  Pointers to functions.  Pointers to pointers.  Pointers to Strings.  Pointers to structures.  pointer (void).  popen Open a pipe.  pow raise a number by a given power.  Practical C (O'Reilly) examples.	P continued #pragma preprocessor  Precedence of operators.  Preprocessor instructions  printenv program.  printf O/P data to the screen or a file.  Problems for you to solve.  Process ID.  Process - is a PID active?  Program examples.  Program name.  putc  putchar. O/P a character to STDOUT.  putenv Create an environmental variable.  puts O/P data to the screen or a file.
Q qsort  qsort O'Reilly 'Using C' example.	Q continued
R \r Carriage Return  rand function.  random numbers.  RAND_MAX numbers.  read function.  readdir function.  Read data from a file.  Reference Variables (C++).	R continued register keyword. Relational Operators Remote Procedure Calls rename function. Rename a file. Return code. return keyword.  reverse Program to reverse characters in a string. rewinddir function. rint function. rmdir function. RPC Remote Procedure CAlls
S __STDC__ PRedefined macro S_ISLNK Is this a link. S_ISREG Is this a regular file. S_ISDIR Is this a directory S_ISCHR S_ISBLK S_ISFIFO S_ISSOCK %s String formatting (printf, scanf etc)  scandir function.  scanf  scope.  seekdir function.  setenv Create an environmental variable.  setjmp.h ANSI header.  setpwent function.  setuid function.  short keyword.  signal.h ANSI header.  signed keyword.  sizeof. Return the storage allocation for a  data type.  sleep function. Pause for the specified number of seconds.  sort an array. sprintf O/P data in tha same way as 'printf' but put it into a string.  sqrt Square root of a number.  srand function. sscanf function. Standard C++ Library Standard headers.  Standard headers.  stat function. Get file status, permissions, ownership etc.  statfs function. Get filesystem status, free blocks, block size etc.  static keyword.  static in C++. static libraries.  stdarg.h ANSI header.  stddef.h ANSI header.  STDERR  STDIN  stdlib.h.  STDOUT  Storage clase.  strcat function. Concatenate strings.  strcasecmp Compare strings ignoring case.  strchr Search for a character in a string.  strcmp Compare strings.  strcoll function. Compare two strings.	S continued strcpy Move strings.  strcspn function. Search a string for a set of characters.  strftime function.  String Constants.  String pointers.  String formating.  strlen  strncat function. Concatenate strings.  strncmp Compare strings.  strncpy Copy N bytes from one string to another.  strpbrk function  strrchr Search for a character in a string.  strrchr function.  strspn function.  strstr function. Search a string for a substring.  strtok function. The books say this function splits a string into tokens. I think its function is best described as parsing a string.  strtol Convert String to a long integer.  struct keyword. Structure arrays.  Structure basics. Structure Initialisation. Structure membership.  Structure pointers.  strxfrm function.  swap two values.  switch keyword.  Syntax.  system Issue a system command.  system calls.  system information.
T __TIME__ Predefined macro \t Horizontal tab  telldir function.  threads.  time functions.  time.h header.	T continued tolower function. Convert an uppercase character to lowercase.  toupper function. Converts a lowercase character to uppercase.  TRUE.  Tutorials on the net.  Data type conversion.  typedef keyword.
U %u formatting.  uname function.  #undef preprocessor  union keyword.  unistd header.  Unix to DOS file conversion.	U continued unlink function, delete a file.  unsetenv function. Remove an environmental variable.  unsigned keyword.  unsigned integer formatting.  Uppercase to lowercase character conversion.  Users /etc/passwd entry.  Using C (O'Reilly) examples.
V va_arg  va_end  va_list  va_start  Variables.  Variable definition.  Variable function parameter lists  Variables - Reference(C++).	V continued Vertical tab \v  vfprintf. Print a va_list to a file.  vprintf. Print a va_list  vsprintf. O/P a va_list into a string.  void keyword.  void *(void pointer).  volatile keyword.
W Width of a field. (printf, scanf etc)  while keyword.  Why use pointers?.  write function.  Write data to a file.	W continued
X \x Hex Character constant  %x Hex formatting (printf, scanf etc)  X program examples.	X continued
Y	Y continued
Z	Z continued