<< |
Java Puzzles Green = Easy, Blue = Normal, Red = Hard P01 P02 P03 P04 P05 P06 P07 P08 P09 P10 P11 P12 P13 P14 P15 P16 P17 P18 P19 P20 P21 P22 P23 P24 By title |
>> |
---|

Here is the second simple Java puzzle

If this simple program is compiled and run, it writes the letter “c” to the standard output.

By adding one statement to the line 9, the program writes “ab” to the standard output.

What is that statement?

### Java puzzle 2: Conditional statements

Level: Normal

public class MyClass { static int x = 4; static int y = 7; static int z = 6; public static void main(String[] args) { // add your statement here! if (x > y) { System.out.print("a"); if (z > y * x && y > 0) { System.out.print("b"); } } else { System.out.print("c"); } } }

###### Author: Sar Maroof

### Answer explanation

- For the program to write the letter “a” to the standard output, the conditional statement if(x > y) must return true. We can do that either by incrementing the value of x or decrementing the value of y. By incrementing the value of x, the second conditional statement if( z > y * x) will return false. Therefore, we better decrement the value of y.
- If we decrement the value of y by 6, the conditional statement if(z > y * x) will return true, because z = 6 and y * x = 1 * 4 = 4 and that is smaller than 6.
- If we decrement the value of y by 7 or more, the conditional statement if(y > 0) will return false. That is the reason that y should be greater than 0 otherwise the letter b wouldn’t be written to the standard output..

public class MyClass { static int x = 4; static int y = 7; static int z = 6; public static void main(String[] args) { y -= 6; // or y = 1; if (x > y) { System.out.print("a"); if (z > y * x && y > 0) { System.out.print("b"); } } else { System.out.print("c"); } } }

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!

Please, leave your questions, feedback and suggestions in the comments below!

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.

## Suggested Articles

## Books by Sar Maroof |

Subscribe to Sar Maroof's RSS feeds! Mail this page to a friend! Bookmark this page! |