Java: An Introduction to Problem Solving and Programming, 8th Edition

Answers to Self-Test Questions

1. 1.

   0
   1
   2
   3
   4
   count after loop = 5

2. 2. Yes, the body of a while loop can execute zero times. No, the body of a do-while loop must execute at least once.

3. 3.

   0
   count after loop = 1

4. 4.

   Scanner keyboard = new Scanner(System.in); 
   int number;
   System.out.println("Enter a whole number:”);
   number = keyboard.nextInt();
   System.out.println("You entered " + number); 
   while (number > 0)
   {
        System.out.println("Enter a whole number:”);
        number = keyboard.nextInt();
        System.out.println("You entered " + number);
   }
   System.out.println("number after loop = " + number);

5. 5. This is an infinite loop. The println statement after the loop will never be executed. The output begins

   0
   −1
   −2
   −3
   .
   .
   .

6. 6.

   while (population <= 0) { System.out.println("Population ...