ANSI C Datatypes

Datatype	Range Min	Platform (Bits) Max	16	32	64 1	64 2
char	-128	127	1	1	1	1
unsigned char	0	255	1	1	1	1
short	-32768	32767	2	2	2	2
unsigned short	0	65535	2	2	2	2
int	-2.147.483.648	2.147.483.647	2	4	4	4
unsigned int	0	4.294.967.295	2	4	4	4
long	-2.147.483.648	2.147.483.647	4	4	8	4
unsigned long	0	4.294.967.295	4	4	8	4
long long	-9.223.372.036.854.755.807	9.223.372.036.854.755.807	8	8	8	8
unsigned long long	0	18.446.744.073.709.551.615	8	8	8	8
float	0	3.40282347E+38 accuracy: 6-digits mantissa: 23-Bits exponent: 8-Bits	4	4	4	4
double	0	1.7976931348623157E+308 accuracy: 15- digits mantissa: 52-Bits exponent: 11-Bits	8	8	8	8
long double	0	3.4E-4932 1.1E+4932 acccuracy:19- digits mantissa: -Bits exponent: -Bits	10	3 10	10	10
void*			2	4	8	8
wchar_t			2	2 4 4 5	2 4	2 4

1

In LP64 data model (used in most Unix and Unix like Systems)

2

In LLP64 data model (used in Windows Systems with Microsoft Visual Studio)

3

On Windows System, long double is used as alias for double

4

On Windows Systems

5

On most Unix and Unix like Systems