ID:3 SCJP Question of the day : Thursday June 10 2010

[Martin Vanyavchich]

What will be the output of this code:

package javaranch;

public class QuestionOfTheDayD2 {
  public static void main(String... args){
    short one, two, three;
    one = 100;
    two = 200;
    boolean first = true;
    boolean second = true;

    if( first^second ){
      three = two + one;
    }else{
      three = two - one;
    }

    System.out.println(three);
  }
} 

You know the rules, let's see your answers


Ref to rules... http://www.coderanch.com/t/498524/java-programmer-SCJP/certification/ID-SCJP-day-Wednesday-June

[HENRY: Added Reference. Change title id as requested]

[Sahil Kapoor]

Dude please do follow the Rules....If possible
Use ID3 instead of ID2

I have already posted ID2.......... i mean before you posted it !!!

You can just change the ID number to 3 in subject line !!!

Thanks for encouraging the concept !!!

Cheers!!!

[Sahil Kapoor]

Compilation Error :- I think ^(XOR) can be applied to integers only ~~!!!

[Martin Vanyavchich]

Sorry about the ID, when I started to post, your thread wasn't up yet. I will try to change it

... and your answer is correct, while the explanation isn't . The '^' XOR can be applied to booleans.

[Ulf Dittmer]

Please leave the name out of the subject - it's long enough as it is. What's more, the name is visible wherever the topic title is visible, so it's redundant to begin with.

[Martin Vanyavchich]

Ulf is right. We could shorten the titles to just "ID# SCJP QOTD" since all othed info is visible wher you select the thread

[Sahil Kapoor]

Ulf Dittmer wrote:Please leave the name out of the subject - it's long enough as it is. What's more, the name is visible wherever the topic title is visible, so it's redundant to begin with.

Okay i agree, we would leave the name of an author from now onwards , but please do keep the date , inspite of being redundant, it looks attractive !!!

[Sahil Kapoor]

If XOR can be applied to booleans
then

Compilation error is on line 12

as (short+short) is solved to (int)
and then int cannot be applied to short again without the explicit cast.

So we could do the following :-

three = (Short) (one + two)    

[Peter Taucher]

The code doesn't compile. But if you'd cast the result of the addition / subtraction to short it would be '100'...

[Martin Vanyavchich]

Sahil and Peter got it right! I'll try to make it more of a challenge the next time

[Lalit Mehra]

I agree with Sahil because ... the auto conversion mechanism of java converts short to int when compiling so we need to re cast the same to short .

@sahil ... XOR can be applied to boolean values as well

[Sahil Kapoor]

Thanks Lalit , i remember it now !!!

[Lalit Mehra]

@Sahil --> your welcome bro