PreTeXt Sample Book Abstract Algebra (SAMPLE ONLY)

  <section xml:id="inactive-code">
    <title>Programs</title>
    <p>
      First, some samples of programs that are not interactive.
      They will be syntax highlighted if a valid <attr>language</attr> is specified.
      Optionally, lines can be numbered and selected lines highlighted.
    </p>
    <listing xml:base="rune-examples/static-listing-java.xml">
  <caption>A static Java program with highlighted lines</caption>
  <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>
</listing>
    <p>
      Instead of specifying <attr>language</attr> on each program,
      a default can be specified at <c>docinfo/programs/@language</c>.
      That value will be used for any program that lacks a <attr>language</attr> attribute.
      This sample does not specify it's own <attr>language</attr> and is relying on the default set in this book.
    </p>
<listing>
<caption>Python program, relying on default programs language</caption>
<program line-numbers="yes" include-source="yes">
<code>
def say_hello():
print("Hello, World!")
say_hello()
</code>
</program>
</listing>
  </section>