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str1: When it comes to NET programming, C# is #1 Length of str1: 44 Lowercase version of str1: when it comes to net programming, c# is #1 Uppercase version of str1: WHEN IT COMES TO NET PROGRAMMING, C# IS #1 Display str1, one char at a time When it comes to NET programming, C# is #1 str1 == str2 str1 != str3 str1 is greater than str3 Index of first occurrence of One: 0 Index of last occurrence of One: 14

Since /6 1 = , 2 12 the angle subtends an arc of the unit circle corresponding to 1/12 of the full circumference Since /6 > 0, the angle represents a counterclockwise rotation It is illustrated in Figure 128 The degree measure of this angle is 180 = 30 6

Before moving on, in the program notice that Compare( ) is called as shown here:

result = stringCompare(str1, str3, StringComparisonCurrentCulture);

Using a visual layout makes sense when you have long units of copy containing more than ve facts, statistics, or numbers For example, consider

7:

In this book we always use radian measure for angles (The reason is that it makes the formulas of calculus turn out to be simpler) Thus, for example, if we refer to ''the angle 2 /3'' then it should be understood that this is an angle in radian measure See Figure 129 Likewise, if we refer to the angle 3 it is also understood to be radian measure We sketch this last angle by noting that 3 is approximately 477 of a full rotation 2 ---refer to Figure 130

Inheritance is the process by which one object can acquire the properties of another object This is important because it supports the concept of hierarchical classification If you think about it, most knowledge is made manageable by hierarchical (that is, top-down) classifications For example, a Red Delicious apple is part of the classification apple, which in turn is part of the fruit class, which is under the larger class food That is, the food class possesses certain qualities (edible, nutritious, and so on) which also, logically, apply to its subclass, fruit In addition to these qualities, the fruit class has specific characteristics (juicy, sweet, and so on) that distinguish it from other food The apple class defines those qualities specific to an apple (grows on trees, not tropical, and so on) A Red Delicious apple would, in turn, inherit all the qualities of all preceding classes and would define only those qualities that make it unique Without the use of hierarchies, each object would have to explicitly define all of its characteristics Using inheritance, an object need only define those qualities that make it unique within its class It can inherit its general attributes from its parent Thus, the inheritance mechanism makes it possible for one object to be a specific instance of a more general case

It is now time to look at an actual C# program We will begin by compiling and running the short program shown next

Part I:

/* This is a simple C# program Call this program Examplecs */ using System; class Example { // A C# program begins with a call to Main() static void Main() { ConsoleWriteLine("A simple C# program"); } }

2p/3

The primary development environment for C# is Microsoft s Visual Studio To compile all of the programs in this book, including those that use the new C# 40 features, you will need to use a version of Visual Studio 2010 (or later) that supports C# Using Visual Studio, there are two general approaches that you can take to creating, compiling, and running a C# program First, you can use the Visual Studio IDE Second, you can use the command-line compiler, cscexe Both methods are described here

Although the Visual Studio IDE is what you will probably be using for your commercial projects, some readers will find the C# command-line compiler more convenient, especially for compiling and running the sample programs shown in this book The reason is that you don t have to create a project for the program You can simply create the program and then compile it and run it all from the command line Therefore, if you know how to use the Command Prompt window and its command-line interface, using the command-line compiler will be faster and easier than using the IDE