More about C Data types

C Data Types	found in Guardian C/C++ Programmers manual
#pragma XMEM	default for TNS C compilers, specifies a 32 bit model. NOXMEM specifies a 16 bit model.
#pragma NOWIDE	changes the size of int, long and short to 16 bit. Only valid for #pragma NOXMEM which we don't use.

To call Guardian Procedures you should include
#pragma EXTENSIONS
#include
In a scrape with compatability problems, use the #pragma OLDCALLs. This specifies the pre C00 parameter order for old programs.

Best practices.
Don't use int. use long or short instead.
Put environment specific functions in an #include .
Avoid HP specific, and C extensions to data types if possible.
Use unsigned only for short and long.


Abbreviation	Long forms	Usage
bool	bool *	Non Ansi
char	char	Ansi - 1 byte (8 bits)
short	short	Ansi - 16 bit integer. Preferred usage.
	signed short
	short int
	signed short int
long	long	32 bit integer. Preferred usage.
	signed long
	long int	Don't use this
	signed long int	Don't use this
int	int, signed, signed int	32 bits, 16 bits with nowide. Don't use this. Use short instead.
unsigned short	unsigned short	16 bit integer
	unsigned short int
unsigned	unsigned
	unsigned int
unsigned long	unsigned long
	unsigned long int
unsigned long long	unsigned long long	Non Ansi. unsigned 64 bit integer.
long long	long long	64 bit. Used when decimal numbers are is followed by ll or LL modifier
decimal	decimal	Non Ansi. Only for programs with #pragma SQL and #include
float	float	Single precision
	float float	Single precision
double double	double	Double precision
long double	long double


Data Types
char	1 byte
int	16 bit integer
float	single precision
double	double precision
short	16 bit integer
long	32 bit integer
signed	+/-
unsigned	+
int, float	pointer to int, float
enum	enumeration constant
const	Unchanging constant
extern	Declare an external variable
register	Declare a register
static	Local variable
void	No value
structure	Define a structure
typedef x	Create a name of a data type
sizeof x	Size of an object
sizeof (x)	Size of a data type
&var	Use the variable at this address