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Exercise 2-1. Insert a bookmark before the Console.Writeline( ) statement in Hello World. Navigate away from it and then use the Bookmarks menu item to return to it. Exercise 2-2. Undock the Solution Explorer window from the right side of the IDE and move it to the left. Leave it there if you like, or move it back. Exercise 2-3. Insert a code snippet for a for loop from the Edit IntelliSense menu into your Hello World program after the WriteLine( ) statement. (It won t do anything for now; you ll learn about for loops in 5.)
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Test Your Knowledge: Exercises |
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C# Language Fundamentals
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1 demonstrates a very simple C# program that prints the text string Hello World! to the console screen and provides a line-by-line analysis of that program. However, even that simple program was complex enough that we had to skip some of the details. In this chapter, we ll begin an in-depth exploration of the syntax and structure of the C# language. The syntax of a language is the order of the keywords, where you put semicolons, and so forth. The semantics are what you are expressing in the code, and how your code fits together. Syntax is trivial and unimportant, but because compilers are absolute sticklers for correct syntax, novice programmers pay a lot of attention to syntax until they are comfortable. Fortunately, Visual Studio 2008 makes managing syntax much easier so that you can focus on semantics, which are far more important. In this chapter, we ll introduce statements and expressions, the building blocks of any program. You ll learn about variables and constants, which let you store values for use in your program. We ll also begin an explanation of types, and we ll take a look at strings, which you saw briefly in the Hello World program. This is all very basic stuff, but it s the foundation you need to start getting fancy. Without variables, your applications can t actually process any data. All variables need types, and variables are used in expressions. You ll see how neatly this all fits together.
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Statements
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In C#, a complete program instruction is called a statement and each statement ends with a semicolon (;). Forgetting a semicolon is a very common mistake for novice programmers, but Visual Studio will catch you if you do it. Programs consist of sequences of statements, such as the following:
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int myVariable; // a statement myVariable = 23; // another statement int anotherVariable = myVariable; // yet another statement
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The compiler starts at the beginning of a source code file and reads downward, executing each statement in the order in which the compiler encounters it. This would be entirely straightforward, and terribly limiting, were it not for branching. Branching allows you to change the order in which statements are evaluated, and even take different paths depending on the value of your variables, but let s not get ahead of ourselves. We ll get to branching in 5.
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Types
C# is a strongly typed language. That means that every object you create or use in a C# program must have a specific type. In other words, you must declare the object to be an integer or a string or a Dog or a Button. Essentially, the type indicates the characteristics of the object and what it can do. Types come in two flavors: those that are built into the language (intrinsic types) and those you create yourself (classes and interfaces, discussed in s 7 and 13). C# offers a number of intrinsic types, shown in Table 3-1.
Table 3-1. The intrinsic types built into C# C# type
byte char bool sbyte short ushort int uint float
Size (in bytes) 1 2 1 1 2 2 4 4 4
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