7.4 Data Types

Table 7-1 lists the size, representation, and range of each scalar data type for the C6000 compiler. Many of the range values are available as standard macros in the header file limits.h.

Table 7-1 TMS320C6000 C/C++ Data Types

			Range
Type	Size	Representation	Minimum	Maximum
char, signed char	8 bits	ASCII	-128	127
unsigned char	8 bits	ASCII	0	255
_Bool, bool	8 bits	ASCII	0 (false)	1 (true)
short	16 bits	Binary	-32 768	32 767
unsigned short, wchar_t ⁽¹⁾	16 bits	Binary	0	65 535
int, signed int	32 bits	Binary	-2 147 483 648	2 147 483 647
unsigned int	32 bits	Binary	0	4 294 967 295
long, signed long	32 bits	Binary	-2 147 483 648	2 147 483 648
unsigned long	32 bits	Binary	0	4 294 967 295
__int40_t	40 bits	Binary	-549 755 813 888	549 755 813 887
unsigned __int40_t	40 bits	Binary	0	1 099 511 627 775
long long, signed long long	64 bits	Binary	-9 223 372 036 854 775 808	9 223 372 036 854 775 807
unsigned long long	64 bits	Binary	0	18 446 744 073 709 551 615
enum ⁽²⁾	32 bits	Binary	-2 147 483 648	2 147 483 647
float	32 bits	IEEE 32-bit	1.175 494e-38⁽³⁾	3.40 282 346e+38
float complex ⁽⁴⁾	64 bits	Array of 2 IEEE 32-bit	1.175 494e-38 for real and imaginary portions separately	3.40 282 346e+38 for real and imaginary portions separately
double	64 bits	IEEE 64-bit	2.22 507 385e-308⁽³⁾	1.79 769 313e+308
double complex ⁽⁴⁾⁽⁵⁾	128 bits	Array of 2 IEEE 64-bit	2.22 507 385e-308 for real and imaginary portions separately	1.79 769 313e+308 for real and imaginary portions separately
long double	64 bits	IEEE 64-bit	2.22 507 385e-308⁽³⁾	1.79 769 313e+308
long double complex ⁽⁴⁾⁽⁵⁾	128 bits	Array of 2 IEEE 64-bit	2.22 507 385e-308 for real and imaginary portions separately	1.79 769 313e+308 for real and imaginary portions separately
pointers, references, pointer to data members	32 bits	Binary	0	0xFFFFFFFF

(1) This is the default type for wchar_t. You can use the --wchar_t option to change the wchar_t type to a 32-bit unsigned int type.

(2) For details about the size of an enum type, see Section 7.4.1.

(3) Figures are minimum precision.

(4) To use complex data types, you must include the <complex.h> header file. See Section 7.5.1 for more about complex data types.

(5) C6600 only

Negative values for signed types are represented using two's complement.

These additional types from C, C99 and C++ are defined as synonyms for standard types:

typedef unsigned int  size_t;
typedef int           ptrdiff_t;
typedef unsigned int  wchar_t;
typedef unsigned int  wint_t;
typedef char *        va_list;