Professional C# 5.0 and .NET 4.5.1

Chapter 2Core C#

WHAT’S IN THIS CHAPTER?

• Declaring variables
• Initialization and scope of variables
• Predefined C# data types
• Dictating execution flow within a C# program using conditional statements, loops, and jump statements
• Enumerations
• Namespaces
• The Main() method
• Basic command-line C# compiler options
• Using System.Console to perform console I/O
• Using internal comments and documentation features
• Preprocessor directives
• Guidelines and conventions for good programming in C#

WROX.COM CODE DOWNLOADS FOR THIS CHAPTER

The wrox.com code downloads for this chapter are found at www.wrox.com/go/procsharp on the Download Code tab. The code for this chapter is divided into the following major examples:

• ArgsExample.cs
• DoubleMain.cs
• ElseIf.cs
• First.cs
• MathClient.cs
• MathLibrary.cs
• NestedFor.cs
• Scope.cs
• ScopeBad.cs
• ScopeTest2.cs
• StringExample.cs
• Var.cs

FUNDAMENTAL C#

Now that you understand more about what C# can do, you will want to learn how to use it. This chapter gives you a good start in that direction by providing a basic understanding of the fundamentals of C# programming, which is built on in subsequent chapters. By the end of this chapter, you will know enough C# to write simple programs (though without using inheritance or other object-oriented features, which are covered in later chapters).

YOUR FIRST C# PROGRAM

Let’s start by compiling and running the simplest possible C# program — a simple console app consisting of a class that writes a message to the screen.

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