# Java quiz 11: While loop

 Java Quizzes   Green = Easy,  Blue = Normal,  Red = Hard  Q01   Q02   Q03   Q04   Q05   Q06   Q07   Q08   Q09   Q10   Q11   Q12   Q13   Q14   Q15   Q16   Q17   Q18   Q19   Q20   Q21   Q22   Q23   Q24   Q25   Q26   Q27   Q28   By title

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

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.

If you found this difficult, you might consider reading my book Java quizmaster for beginners. It is easy to understand, organized to learn Java in 17 days and it guides you to master Java code by solving 105 quizzes and 117 assignments. This book explains each chapter properly before starting with exercises and assignments. It is available on Amazon. See inside the book here!