Java quiz 11: While loop

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The while loop is one of the types of loops in Java. Every advanced Java programmer see what happens in this program,  but unfortunately that doesn’t apply to beginners. Therefore, as a beginner programmer, you need to practice regularly to master that kind of loops.

Java quiz 11: Practicing with while loop

Level: Easy

What is written to the standard output as the result of executing the following code?

 
public class WhileLoop
{
  public static void main(String[] args)
  {
    int i = 1;
    while (i < 9)
    {
      i += 2;
      System.out.print(i);
    }
  }
}
                      Author: Sar Maroof

Select the correct answer.


Answer explanation

  1. The statement while (i < 9) means that execute the body of the loop as long as the variable i is smaller than 9.
  2. The initial value of i is equal to 1 and that is smaller than 9. Therefore the body of the loop is executed.
  3. The statement i += 2; increments the value of i by 2. So, i = 1 + 2 = 3. The statement System.out.print(i); writes 3 to the standard outpu.
  4. The value of i is now 3 and that is smaller than 9. Therefore the body of the loop is executed. The statement i += 2; increments the value of i by 2. So, i = 3 + 2 = 5 and 5 is written to the standard output.
  5. The value of i is now 5 and that is smaller than 9. Therefore the body of the loop is executed. The statement i += 2; increments the value of i by 2. So, i = 5 + 2 = 5 and 7 is written to the standard output.
  6. The value of i is now 7 and that is smaller than 9. Therefore the body of the loop is executed. The statement i += 2; increments the value of i by 2. So, i = 7 + 2 = 9 and 9 is written to the standard output.
  7. The value of i is now 9, but 9 is not smaller than 9 that is why the loop is terminated and the program writes 3579 to the standard output.
    The correct answer is: a.

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Sar Maroof is graduated from HBO Amsterdam "higher professional education". He is a professional computer programming teacher, gives master classes and publishes technical articles. His experience with developing software started from 2001 and he has worked as a software developer for several big as well as small companies and later as a freelancer. He is the author of Java quizmaster and Build a Java application in 7 days.

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