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Chapter 1. Numbers

Simple types are value types that are a subset of the built-in types in Visual C# .NET, although, in fact, the types are defined as part of the .NET Framework Class Library (.NET FCL). Simple types are made up of several numeric types and a bool type. These numeric types consist of a decimal type (decimal), nine integral types (byte, char, int, long, sbyte, short, uint, ulong, ushort), and two floating-point types (float, double). Table 1-1 lists the simple types and their fully qualified names in the .NET Framework.

Table 1-1. The simple data types

Fully qualified name

Reserved C# keyword

Value range

System.Boolean

bool

true or false

System.Byte

byte

0 to 255

System.SByte

sbyte

-128 to 127

System.Char

char

0 to 65535

System.Decimal

decimal

-79,228,162,514,264,337,593,543,950,335 to 79,228,162,514,264,337,593,543,950,335

System.Double

double

-1.79769313486232e308 to 1.79769313486232e308

System.Single

float

-3.402823e38 to 3.402823e38

System.Int16

short

-32768 to 32767

System.Uint16

ushort

0 to 65535

System.Int32

int

-2,147,483,648 to 2,147,483,647

System.UInt32

uint

0 to 4,294,967,295

System.Int64

long

-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807

System.UInt64

ulong

0 to 18,446,744,073,709,551,615

The C# reserved words for the various data types are simply aliases for the fully qualified type name. Therefore, it does not matter whether you use the type name or the reserved word: the C# compiler will generate identical code.

It should be noted that the following types are not CLS-compliant: sbyte, ushort, uint, and ulong. These types do not conform to the rules governing CLS types and therefore, they might not be supported by other .NET languages. This lack of support might limit or impede the interaction between your C# code and code written in another CLS-compliant language, such as Visual Basic .NET.

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