Data Literals - Example

C# Tutorials - Herong's Tutorial Examples

∟Data Literals - Example

This section provides a tutorial example on how to enter data literals into C# programs. 5 types of data literals used in C#: Boolean, Integer, Real, Character and String.

Now let's apply what we have learned so far, and write the following experimental program with literals.cs as the file name:

// Literals.cs
// Copyright (c) 2006 HerongYang.com. All Rights Reserved.

class Literals {
   public static void Main() {
      System.Console.WriteLine(
         "Boolean literals: {0} and {1}.", true, false);
      System.Console.WriteLine(
         "Integer literals: {0}, {1}, {2}, {3}.", 0, 555, -777, 911);
      System.Console.WriteLine(
         "Real literals: {0}, {1}, {2}, {3}.", 0.0, 555.0, -777.0,
         3.14159);
      System.Console.WriteLine(
         "Character literals: {0}, {1}, {2}, {3}.", 'a', 'A', '0',
         '9');
      System.Console.WriteLine(
         "Character literals: {0}, {1}, {2}, {3}, {4}.", '\t', '\r',
         '\n', '\"', '\\');
      System.Console.WriteLine(
         "String literals: {0}, {1}, {2}.", "911", "Hello world!",
         "Joe said \"Hello\" to me.");
   }
}

After compiling and executing the program, we will get the following output:

Boolean literals: True and False.
Integer literals: 0, 555, -777, 911.
Real literals: 0, 555, -777, 3.14159.
Character literals: a, A, 0, 9.
, aracter literals:     ,
, ", \.
String literals: 911, Hello world!, Joe said "Hello" to me..

There are a couple of interesting things to be noted here:

The boolean literal "true" is converted to a string with an upper case "T".
The real literal "0.0" is converted to a string with the trailing ".0" removed.
The character literals for special commands are executed while being displayed on the screen. The tab command '\t' pushed the next character ',' to the next tab position with several space characters. The return command '\r' pushed the next character back to the beginning of the line and whipped out the original character 'C'. The new line command '\n' forced the display process to move the next line.