Built-in Types

C# includes several built-in types that fall into the categories of both reference types and value types. Table 2.1 displays the built-in C# types, allowed values, and examples (with literal suffixes where appropriate). Suffixes can be expressed in either upper- or lowercase.

Table 2.1. C# Built-in Types

TYPE NAME	ALLOWED VALUES	EXAMPLE AND/OR LITERAL SUFFIX
bool	true or false	true
char	A single Unicode character	'A'
sbyte	-128 to 127 (8-bit)	-16
byte	0 to 255 (8-bit)	32
short	-32768 to 32767 (16-bit)	-256
ushort	0 to 65535 (16-bit)	128
int	-2147483648 to 2147483647 (32-bit)	-100000
uint	0 to 4294967295 (32-bit)	200000
long	-9223372036854775808 to 9223372036854775807 (64-bit)	-5000000000L
ulong	0 to 18446744073709551615 (64-bit)	10000000000L
float	1.5 x 10-45 to 3.4 x 1038 (32-bit/7-digit precision)	375.95f
double	5.0 x 10-324 to 1.7 x 10308 (64-bit/15 16-digit precision)	1.0000000001d
decimal	1.0 x 10-28 to 7.9 x 1028 (128-bit/15 16 decimal places)	75.95m
string	A sequence of Unicode characters	"Welcome"
object	The ultimate base type for all other types	object obj = new MyType();