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The bool type represents true/false values C# defines the values true and false using the reserved words true and false Thus, a variable or expression of type bool will be one of these two values Furthermore, there is no conversion defined between bool and integer values For example, 1 does not convert to true, and 0 does not convert to false Here is a program that demonstrates the bool type:

// Demonstrate bool values using System; class BoolDemo { static void Main() { bool b; b = false; ConsoleWriteLine("b is " + b); b = true; ConsoleWriteLine("b is " + b); // A bool value can control the if statement if(b) ConsoleWriteLine("This is executed"); b = false; if(b) ConsoleWriteLine("This is not executed"); // Outcome of a relational operator is a bool value ConsoleWriteLine("10 > 9 is " + (10 > 9)); } }

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The output generated by this program is shown here:

3:

Add Credibility as You Revise 77 Speci cs Increase Believability 77 Exercise 11: Add Speci city to General Statements 79 Exercise 12: Add Examples to Make Dull Copy Come Alive 82 Exercise 13: Add Speci city to Increase Reader Understanding 83 Select the Best Word to Express Your Meaning 83 Exercise 14: Select Words with FURY 88 Exercise 15: Revise in a Methodical Manner 89

There are three interesting things to notice about this program First, as you can see, when a bool value is output by WriteLine( ), True or False is displayed Second, the value of a bool variable is sufficient, by itself, to control the if statement There is no need to write an if statement like this:

60 Introductory Remarks 61 Logarithm Basics 611 A New Approach to Logarithms 612 The Logarithm Function and the Derivative 62 Exponential Basics 621 Facts about the Exponential Function 622 Calculus Properties of the Exponential 623 The Number e 63 Exponentials with Arbitrary Bases 631 Arbitrary Powers 632 Logarithms with Arbitrary Bases 64 Calculus with Logs and Exponentials to Arbitrary Bases 641 Differentiation and Integration of loga x and ax 642 Graphing of Logarithmic and Exponential Functions 643 Logarithmic Differentiation 65 Exponential Growth and Decay 651 A Differential Equation 652 Bacterial Growth 653 Radioactive Decay 654 Compound Interest 66 Inverse Trigonometric Functions 661 Introductory Remarks 662 Inverse Sine and Cosine 663 The Inverse Tangent Function 664 Integrals in Which Inverse Trigonometric Functions Arise 665 Other Inverse Trigonometric Functions

if(b == true)

Third, the outcome of a relational operator, such as <, is a bool value This is why the expression 10 > 9 displays the value True Further, the extra set of parentheses around 10 > 9 is necessary because the + operator has a higher precedence than the >

Up to this point, when data has been output using a WriteLine( ) statement, it has been displayed using the default format However, the NET Framework defines a sophisticated formatting mechanism that gives you detailed control over how data is displayed Although formatted I/O is covered in detail later in this book, it is useful to introduce some formatting options at this time Using these options, you will be able to specify the way values look when output via a WriteLine( ) statement Doing so enables you to produce more appealing output Keep in mind that the formatting mechanism supports many more features than described here When outputting lists of data, you have been separating each part of the list with a plus sign, as shown here:

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ConsoleWriteLine("You ordered " + 2 + " items at $" + 3 + " each");

While very convenient, outputting numeric information in this way does not give you any control over how that information appears For example, for a floating-point value, you can t control the number of decimal places displayed Consider the following statement:

ConsoleWriteLine("Here is 10/3: " + 100/30);

It generates this output:

71 Integration by Parts 240 72 Partial Fractions 245 721 Introductory Remarks 245 722 Products of Linear Factors 247 723 Quadratic Factors 251 73 Substitution 252 74 Integrals of Trigonometric Expressions 256 Quiz 261