Simple Types

The table in Appendix L, Simple Types, lists the thirteen simple types in C#. Like its predecessor languages C and C++, C# requires all variables to have a type. For this reason, C# is referred to as a strongly typed language.

In C and C++, programmers frequently have to write separate versions of applications to support different computer platforms, because the simple types are not guaranteed to be identical from computer to computer. For example, an int value on one machine might be represented by 16 bits (2 bytes) of memory, while an int value on another machine might be represented by 32 bits (4 bytes) of memory. In C#, int values are always 32 bits (4 bytes). In fact, all C# numeric types have fixed sizes, as is shown in Appendix L, Simple Types.

Each type in Appendix L is listed with its size in bits (there are eight bits to a byte) and its range of values. Because the designers of C# want it to be maximally portable, they use internationally recognized standards for both character formats (Unicode; for more information, visit and floating-point numbers (IEEE 754; for more information, visit

Recall from Section 4.5 that variables of simple types declared outside of a method as fields of a class are automatically assigned default values unless explicitly initialized. Instance variables of types char, byte, sbyte, short, ushort, int, uint, long, ulong, float, double, and decimal are all given the value 0 by default. Instance variables of type bool are given the value false by default. Similarly, reference type instance variables are initialized by default to the value null.

(Optional) Software Engineering Case Study Identifying Class Attributes in the ATM System



    Introduction to Computers, the Internet and Visual C#

    Introduction to the Visual C# 2005 Express Edition IDE

    Introduction to C# Applications

    Introduction to Classes and Objects

    Control Statements: Part 1

    Control Statements: Part 2

    Methods: A Deeper Look


    Classes and Objects: A Deeper Look

    Object-Oriented Programming: Inheritance

    Polymorphism, Interfaces & Operator Overloading

    Exception Handling

    Graphical User Interface Concepts: Part 1

    Graphical User Interface Concepts: Part 2


    Strings, Characters and Regular Expressions

    Graphics and Multimedia

    Files and Streams

    Extensible Markup Language (XML)

    Database, SQL and ADO.NET

    ASP.NET 2.0, Web Forms and Web Controls

    Web Services

    Networking: Streams-Based Sockets and Datagrams

    Searching and Sorting

    Data Structures



    Appendix A. Operator Precedence Chart

    Appendix B. Number Systems

    Appendix C. Using the Visual Studio 2005 Debugger

    Appendix D. ASCII Character Set

    Appendix E. Unicode®

    Appendix F. Introduction to XHTML: Part 1

    Appendix G. Introduction to XHTML: Part 2

    Appendix H. HTML/XHTML Special Characters

    Appendix I. HTML/XHTML Colors

    Appendix J. ATM Case Study Code

    Appendix K. UML 2: Additional Diagram Types

    Appendix L. Simple Types


    Visual C# How to Program
    Visual C# 2005 How to Program (2nd Edition)
    ISBN: 0131525239
    EAN: 2147483647
    Year: 2004
    Pages: 600 © 2008-2020.
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