Formatting Text with Console.Write and Console.WriteLine

Console methods Write and WriteLine also have the capability to display formatted data. Figure 3.17 outputs the strings "Welcome to" and "C# Programming!" with WriteLine.

Figure 3.17. Printing multiple lines of text with string formatting.

 1 // Fig. 3.17: Welcome4.cs
 2 // Printing multiple lines of text with string formatting.
 3 using System;
 4
 5 public class Welcome4
 6 {
 7 // Main method begins execution of C# application
 8 public static void Main( string[] args )
 9 {
10 Console.WriteLine( "{0}
{1}", "Welcome to", "C# Programming!" );
11 } // end method Main
12 } // end class Welcome4
 
Welcome to
C# Programming!

Line 10

Console.WriteLine( "{0}
{1}", "Welcome to", "C# Programming!" );

calls method Console.WriteLine to display the application's output. The method call specifies three arguments. When a method requires multiple arguments, the arguments are separated with commas (,)this is known as a comma-separated list.

Good Programming Practice 3 7

Place a space after each comma (,) in an argument list to make applications more readable.

Remember that all statements end with a semicolon (;). Therefore, line 10 represents only one statement. Large statements can be split over many lines, but there are some restrictions.

Common Programming Error 3 6

Splitting a statement in the middle of an identifier or a string is a syntax error.

Method WriteLine's first argument is a format string that may consist of fixed text and format items. Fixed text is output by WriteLine as we demonstrated in Fig. 3.1. Each format item is a placeholder for a value. Format items also may include optional formatting information.

Format items are enclosed in curly braces and contain a sequence of characters that tell the method which argument to use and how to format it. For example, the format item {0} is a placeholder for the first additional argument (because C# starts counting from 0), {1} is a placeholder for the second, etc. The format string in line 10 specifies that WriteLine should output two arguments and that the first one should be followed by a newline character. So this example substitutes "Welcome to" for the {0} and "C# Programming!" for the {1}. The output shows that two lines of text are displayed. Note that because braces in a formatted string normally indicate a placeholder for text substitution, you must type two left braces () to insert a single left or right brace into a formatted string, respectively. We introduce additional formatting features as they are needed in our examples.

Another C# Application Adding Integers

Preface

Index

    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

    Arrays

    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

    Multithreading

    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

    Generics

    Collections

    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

    Index

    show all menu



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