Java quiz 18: A while loop & conditional statements

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Here we have a combination of a while loop and a conditional statement.

Java quiz 18: A while loop and conditional statements

Level: Normal

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

public class MyClass
{
  static boolean isActive;
  
  public static void main(String[] args)
  {
    int x = 7;
    int y = 1;
    while(!isActive)
    {
      if(x < 17)
      {
        x += 3;
        y += 2;
        if(x + y > 17)
        {
          isActive = true;
        }
      }
    }
    System.out.print(x - y);
  }
}
Author: Sar Maroof

Select the correct answer.


Answer explanation

  1. The boolean variable isActive is not initialized. Therefore its value is false by default.
  2. As long as the variable isActive is false, the body of the while loop is executed.
  3. The statement x += 3; increments the value of x by 3. The statement y += 2; increments the value of y by 2. Therefore x = 7 + 3 = 10 and y = 1 + 2 = 3.
  4. The statement if(x + y > 17) returns false, because x + y = 10 + 3 = 13 and that is not greater than 17.
  5. For the next execution of the loop. x = 10 + 3 = 13, y = 3 + 2 = 5.So, x + y = 13 + 5 = 18 and that is greater than 17.
  6. For the next execution of the loop. x = 13 + 3 = 16, y = 3 + 2 = 5. x + y = 13 + 5 = 18 and that is greater than 17. Therefore the loop is executed and the staement System.out.print(x – y); writes x – y = 13 – 5 = 8 to the standard output.

The correct answer is: f.

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Sar Maroof is a professional software development teacher, gives master classes and publishes technical articles. He is also an expert software developer and worked for several big as well as small companies and later as a freelancer.

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