Java puzzle 11: Operators

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The combination of operators and conditional statements appear in almost every program. Every Java programmer should master all types
of conditional statements. Therefore, I focus to offer that in different ways in my puzzles and quizzes. Please, always check out the explanation of the answer if you have doubts.

Java puzzle 11: Operators and conditional statements

Level: Easy

What is the output of this program and why?

public class Operator
{
  public static void main(String[] args)
  {
    int i = 2;
    int i2 = 4;
    int i3 = 7;
    if(i + i2 > i3 || i2 > i3 || i + i3 >= 9)
    {
      if(i2 == i + 2 && i2 < i)
      {
        System.out.print("x");
      }
      System.out.print("z");
    }
    else
    {
      System.out.print("y");
    }
  }
}
Author: Sar Maroof

Answer explanation

  1. The first if statement if(i + i2 > i3 || i2 > i3 || i + i3 >= 9) uses the conditional operator || (OR). By using || operator, the condition is true if one of the operands returns true.
    i + i2 > i3 returns false. i2 > i3 returns false. i + i3 >= 9 returns true. Therefore the if block is executed and the else block is ignored.
  2. By using the conditional operator && (AND) see the second statement if(i2 == i + 2 && i2 < i)  both operands must return true otherwise the block wouldn’t be executed.          i2 == i + 2 returns true.
    i2 < i returns false. Therefore the block is not executed and the letter x is not written to the standard output.
  3. The statement System.out.print(“z”); is inside the first conditional statement, which returns true. Therefore, the letter z is written to the standard output.

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SarMaroof.com offers a practical method to learn and improve your Java skills. It avoids unnecessary long boring theoretical explanations, but it uses many exercises and quizzes.




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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