Java quiz 27: Multiple variables in a loop

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Java quiz 27: Multiple variables in a loop

Level: Normal

What is the output of the following code?

public class MyLoop
{
  public static void main(String args[])
  {
    int x;
    int y;
    for(x = 0, y = 3; x < y; x += 2, y++)
    {
      System.out.print("");
    }
    System.out.print(x + "," + y);
  }
}
Author: Sar Maroof

Select the correct answer.

Answer explanation

  1. The statement for(x = 0, y = 3; x < y; x += 2, y++) indicates that the initial value of x = 0 and y = 3. As long as x is smaller than y the body of the loop is executed.
  2. x is smaller than y therefore, the body of the loop is exectued, the value of x is equal to x = x + 2 = 2, y = y + 1 = 3 + 1 = 4.
  3. By the next exectuion the value of x = x + 2 = 2 + 2 = 4, and y = y + 1 = 4 + 1 = 5.
  4. By the next execution the value of x = x + 2 = 4 + 2 = 6, and y = y + 1 = 5 + 1 = 6.
  5. Now, the the execution of the loop is terminated because y is no longer greater than x.
    The correct answer is: d.

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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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