SB Programs

Section 3.1 Programs

First, some samples of programs that are not interactive. They will be syntax highlighted if a valid @language is specified. Optionally, lines can be numbered and selected lines highlighted.

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Listing 3.1.1. A static Java program with highlighted lines

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View Source for program

<program language="java" line-numbers="yes" highlight-lines="2,6-8" include-source="yes">
    <title>"hi" in Java</title>
    <code>
    import javax.swing.JFrame;  //Importing class JFrame
    import javax.swing.JLabel;  //Importing class JLabel
    public class HelloWorld {
        public static void main(String[] args) {
            JFrame frame = new JFrame();           //Creating frame
            frame.setTitle("Hi!");                 //Setting title frame
            frame.add(new JLabel("Hello, world!"));//Adding text to frame
            frame.pack();                          //Setting size to smallest
            frame.setLocationRelativeTo(null);     //Centering frame
            frame.setVisible(true);                //Showing frame
        }
    }
    </code>
</program>

import javax.swing.JFrame;  //Importing class JFrame
import javax.swing.JLabel;  //Importing class JLabel
public class HelloWorld {
    public static void main(String[] args) {
        JFrame frame = new JFrame();           //Creating frame
        frame.setTitle("Hi!");                 //Setting title frame
        frame.add(new JLabel("Hello, world!"));//Adding text to frame
        frame.pack();                          //Setting size to smallest
        frame.setLocationRelativeTo(null);     //Centering frame
        frame.setVisible(true);                //Showing frame
    }
}

Instead of specifying @language on each program, a default can be specified at docinfo/programs/@language. That value will be used for any program that lacks a @language attribute. This sample does not specify it’s own @language and is relying on the default set in this book.

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Listing 3.1.2. Python program, relying on default programs language

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View Source for program

<program line-numbers="yes" include-source="yes">
    <code>
    def say_hello():
        print("Hello, World!")

    say_hello()
    </code>
</program>

def say_hello():
    print("Hello, World!")

say_hello()

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