C Now - Data Types

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C Now
Data Types
November 25, 1999

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**Basic C Data Types**
Type	Description	16 bit		32 bit
Type	Description	size	range	size	range
char	fixed point binary	1	[0, 255] or [-128, 127]	1	[0, 255] or [-128, 127]
int	fixed point binary	2	[-32768, 32767]	4	[- 2147483648, 2147483647]
float	floating-point binary	4	(-3.40282347 * 10³⁸, -1.17549435 * 10^-38) 0, and (1.17549435 * 10^-38, 3.40282347 * 10^-38)	4	(-3.40282347 * 10³⁸, -1.17549435 * 10^-38) 0, and (1.17549435 * 10^-38, 3.40282347 * 10^-38)
double	floating-point binary	8	(-1.7976931348623158 * 10³⁰⁸, -2.2250738585072014 * 10^-308) 0, and (2.2250738585072014 * 10^-308, 1.7976931348623158 * 10³⁰⁸)	8	(-1.7976931348623158 * 10³⁰⁸, -2.2250738585072014 * 10^-308) 0, and (2.2250738585072014 * 10^-308, 1.7976931348623158 * 10³⁰⁸)

**Modified C Data Types**
Type	Description	16 bit		32 bit
Type	Description	size	range	size	range
signed char	fixed point binary	1	[-128, 127]	1	[-128, 127]
unsigned char	fixed point binary	1	[0, 255]	1	[0, 255]
short	fixed point binary	2	[-32768, 32767]	2	[-32768, 32767]
short int	fixed point binary	2	[-32768, 32767]	2	[-32768, 32767]
short signed int	fixed point binary	2	[-32768, 32767]	2	[-32768, 32767]
short unsigned int	fixed point binary	2	[0, 65537]	2	[0, 65537]
signed	fixed point binary	2	[-32768, 32767]	4	[- 2147483648, 2147483647]
signed int	fixed point binary	2	[-32768, 32767]	4	[- 2147483648, 2147483647]
unsigned	fixed point binary	2	[0, 65535]	4	[0, 4294967295]
unsigned int	fixed point binary	2	[0, 65535]	4	[0, 4294967295]
long	fixed point binary	4	[-2147483648, 2147483647]	4	[-2147483648, 2147483647]
signed long	fixed point binary	4	[-2147483648, 2147483647]	4	[-2147483648, 2147483647]
unsigned long	fixed point binary	4	[0, 4294967295]	4	[0, 4294967295]
long double	floating-point binary	10	(-1.1897314953572317649 * 10⁴⁹³², -3.362103143112094 * 10^-4932) 0, and (-3.362103143112094 * 10^-4932, 1.1897314953572317649 * 10⁴⁹³²)	10	(-1.1897314953572317649 * 10⁴⁹³², -3.362103143112094 * 10^-4932) 0, and (-3.362103143112094 * 10^-4932, 1.1897314953572317649 * 10⁴⁹³²)

Symbolic Ranges^*
Type	Description	Range
short	Fixed point binary	[0, MAXSHORT]
int	Fixed point binary	[0, MAXINT]
long	Fixed point binary	[0, MAXLONG]
float	Floating point binary	(-MAXFLOAT, -MINFLOAT), 0, (MINFLOAT, MAXFLOAT)
double	Floating point binary	(-MAXDOUBLE, -MINDOUBLE), 0, (MINDOUBLE, MAXDOUBLE)
long double	Floating point binary	(-MAXLDOUBLE, -MINLDOUBLE), 0, (MINLDOUBLE, MAXLDOUBLE)

^*These symbolic constants are defined in values.h.

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