SOURCE CODE FILES FOR THE Structured EXAMPLES

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/**
 * Project Doubling1
 * Class Doubling
 *
 * Print the powers of 2 that 
 * are less than or equal to 100.
 */

public class Doubling
{
    public static void main(String[] args)
    {
        int x = 1;
    
        // Keep printing numbers while x 
        // is less than or equal to 100.
        // Double number at the end of each
        // pass through the while loop.
        while(x <= 100)
        {
            System.out.print(x + " ");
            x *= 2;
        }
        // Go to a new line for next run.
        System.out.println();
    }
}
// Output:
1 2 4 8 16 32 64 

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/**
 * Project DaysOfWeek
 * Class DaysOfWeek
 *
 * Input a daycode and print the corresponding day 
 * of the week.  Use if..else statements to find 
 * the day of the week from the day code.
 */

import javax.swing.JOptionPane;
    
public class DaysOfWeek
{
    public static void main(String[] args)
    {
        int daycode;

        // Show input dialog.
        daycode = Integer.parseInt(
            JOptionPane.showInputDialog("Enter a day code.");

        // Obtain day of week for given daycode.
        if(daycode == 1)
            System.out.println("Sunday");
        else if(daycode == 2)
            System.out.println("Monday");
        else if(daycode == 3)
            System.out.println("Tuesday");
        else if(daycode == 4)
            System.out.println("Wednesday");
        else if(daycode == 5)
            System.out.println("Thursday");
        else if(daycode == 6)
            System.out.println("Friday");
        else if(daycode == 7)
            System.out.println("Saturday");
        else
            System.out.println("Bad day code");
    }
}
// Sample session. The 3 is entered by the user.

Enter a day code: 3
Tuesday

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/**
 * Project SumTo100
 * Class SumTo100
 * 
 * Compute the sum of the numbers from 
 * 1 to TARGET, where TARGET is an int 
 * constant.
 */

public class SumTo100
{
	public static void main(String[] args)
	{
		int i, sum = 0;
		final int TARGET = 100;

		for(i = 1; i <= TARGET; i++)
			sum += i;
		System.out.println("The sum of the first " + 
		     TARGET + " numbers is " + sum + ".");
	}
}
// Output:
The sum of the first 100 numbers is 5050.

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/**
 * Project Doubling2
 * Class Doubling
 * Print the powers of 2 that 
 * are less than or equal to 100.
 */

public class Doubling
{
	public static void main(String[] args)
	{
		// This for loop is equivalent to 
		// while loop in the Doubling1 project.
		for(int x = 1; x <= 100; x *= 2)
			System.out.print(x + " ");

		// Go to a new line for next run.
		System.out.println();
	}
}
// Output:
1 2 4 8 16 32 64

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/**
 * Project IWillNot
 * Class Repeater
 * Repeat a sentence multiple times.
 */

import javax.swing.JOptionPane;
public class Repeater
{
    public static void main(String[] args)
    {
        String sentenceToRepeat;
        int timesToRepeat, i;

        sentenceToRepeat = JOptionPane.showInputDialog(
            "Enter sentence to repeat.");
        timesToRepeat = Integer.parseInt(
            JOptionPane.showInputDialog("Enter times to repeat."));
        
        for(i = 1; i <= timesToRepeat; i++)
            System.out.println(i + ". " + 
                sentenceToRepeat);
    }
}
// Sample session.  The user enters "I will not talk in class."
and 10 in the input dialogs.

Enter sentence to repeat: I will not talk in class.
Enter times to repeat: 10
1. I will not talk in class.
2. I will not talk in class.
3. I will not talk in class.
4. I will not talk in class.
5. I will not talk in class.
6. I will not talk in class.
7. I will not talk in class.
8. I will not talk in class.
9. I will not talk in class.
10. I will not talk in class.

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