C# Data Type and Expressions

2

Data Types and Expressions

C# Programming: From Problem Analysis to Program Design

3rd Edition

C# Programming: From Problem Analysis to Program Design

1

Chapter Objectives

• Examine how computers represent data

• Declare memory locations for data • Explore the relationship between classes, objects, and types • Use predefined data types

• Use integral data types

C# Programming: From Problem Analysis to Program Design

2

Chapter Objectives (continued)

• Use floating-point types

• Learn about the decimal data type

• Declare Boolean variables

• Declare and manipulate strings • Work with constants

C# Programming: From Problem Analysis to Program Design

3

Chapter Objectives (continued)

• Write assignment statements using arithmetic operators

• Learn about the order of operations • Learn special formatting rules for currency

• Work through a programming example that illustrates the chapter’s concepts

C# Programming: From Problem Analysis to Program Design

4

Data Representation

• Bits

– Bit – "Binary digIT" – Binary digit can hold 0 or 1 – 1 and 0 correspond to on and off, respectively

• Bytes

– Combination of 8 bits – Represent one character, such as the letter A – To represent data, computers use the base-2 number system, or binary number system

C# Programming: From Problem Analysis to Program Design

5

Binary Number System

Figure 2-1 Base–10 positional notation of 1326

C# Programming: From Problem Analysis to Program Design 6

Binary Number System (continued)

Figure 2-2 Decimal equivalent of 01101001

C# Programming: From Problem Analysis to Program Design 7

Data Representation (continued)

C# Programming: From Problem Analysis to Program Design

8

Data Representation (continued)

• Character sets

– With only 8 bits, can represent 28, or 256, different decimal values ranging from 0 to 255; this is 256 different characters

• Unicode – Character set used by C#...