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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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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