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C# contains two general categories of built-in data types: value types and reference types The difference between the two types is what a variable contains For a value type, a variable holds an actual value, such 31416 or 212 For a reference type, a variable holds a reference to the value The most commonly used reference type is the class, and a discussion of classes and reference types is deferred until later in this book The value types are described here At the core of C# are the 13 value types shown in Table 3-1 Collectively, these are referred to as the simple types They are called simple types because they consist of a single value (In other words, they are not a composite of two or more values) They form the foundation of C# s type system, providing the basic, low-level data elements upon which a program operates The simple types are also sometimes referred to as primitive types

In order to produce professional communications, you need to adhere to the rules of grammar that apply to business writing, ensure your punctuation is correct and consistent, verify that you re using the proper words, and capitalize correctly EXERCISE 40: Proofread for Perfection In the last chapter you learned to be vigilant in proo ng your work so that your documents are correct before they leave your of ce Now review your draft and Brad s, correcting any errors you nd Did you nd many errors Brad did He said, I found all sorts of errors I had subject/verb agreement, word usage, and grammar issues Here are the errors Brad identi ed and his comments

Part I:

( 1)4/5 ( )4/5 4/5 4/5

Meaning Represents true/false values 8-bit unsigned integer Character Numeric type for financial calculations Double-precision floating point Single-precision floating point Integer Long integer 8-bit signed integer Short integer An unsigned integer An unsigned long integer An unsigned short integer

C# strictly specifies a range and behavior for each value type Because of portability requirements, C# is uncompromising on this account For example, an int is the same in all execution environments There is no need to rewrite code to fit a specific platform Although strictly specifying the size of the value types may cause a small loss of performance in some environments, it is necessary in order to achieve portability

C# defines nine integer types: char, byte, sbyte, short, ushort, int, uint, long, and ulong However, the char type is primarily used for representing characters, and it is discussed later in this chapter The remaining eight integer types are used for numeric calculations Their bit-width and ranges are shown here:

0+ 6

Type byte sbyte short ushort int uint long ulong Width in Bits 8 8 16 16 32 32 64 64 Range 0 to 255 128 to 127 32,768 to 32,767 0 to 65,535 2,147,483,648 to 2,147,483,647 0 to 4,294,967,295 9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 0 to 18,446,744,073,709,551,615

3: