Java quiz 13: Working with while loop

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This program is a simple while loop. Working with while loop is needed regularly for every Java programmers.

Java quiz 13: Working with while loops

Level: Easy

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

public class MyClass
{
  public static void main(String[] args)
  {
    int i = 1;
    int x = 1;
    while(i < 4)
    {
      x += i;
      i++;
    }
    System.out.print(x);
  }
}
  Author: Sar Maroof

Select the correct answer.


Answer explanation

  1. The initial value of i is 1. Each time the body of the loop is executed the value of i is incremented by one. The while statement returns true as long as the value of i is smaller than 5.
  2. By the first execution of the loop the value of i is 1, the statement of x += i; increments the value of x by i. The initial value of x is 1. So, x = x + i = 1 + 1 = 2.
  3. By the second execution of the loop the value of i is 2. x = x + i = 2 + 2 = 4.
  4.  By the third execution of the loop the value of i is 3. x = x + i = 4 + 3 = 7.
  5. By the fourth execution of the loop the value of i is 4. x = x + i = 7 + 4 = 11.
  6. By the fifth time the value of i is 5 and that is not smaller than 5. Therefore the loop is terminated and 11 is written to the standard output.

The correct answer is: d.

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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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