ID:6 SCJP Question of the day : Saturday June 12 2010

[Sahil Kapoor]

Source :- Sahil Rally Neuron's !!!

class ScjpPrepration6 {
  public static void main(String[] args) {
    
    System.out.println(4.4/0);       //Line 1
    System.out.println(4/0);         // Line 2
    System.out.println(true/0);     // Line 3
    System.out.println(4.4f/0);     // Line 4
    System.out.println(-4.4f/0);   // Line 5
    System.out.println(-4.4/0);    // Line 6
    System.out.println(0/0);        // Line 7
    System.out.println(0.0/0);     // Line 8
    System.out.println(-0.0/0);   //Line 9
    System.out.println(true/false); // Line 10
  }
}

Tell Output, Compiler Error and Runtime error at each line of above code ???

Best Wishes !!!
Cheers!!!



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

[Ankit Garg]

Hmm, good one, let me try
1->Infinity
2->Exception
3->compile time error
4->Infinity
5->-Infinity
6->-Infinity
7->Exception
8->Infinity
9->-Infinity
10->compile time error

(I hope not all are wrong )

[Larry Olson]

Good question. The principles to remember to be able to answer this question are:

- Division operation could be performed only on numeric values. Trying to divide non-numeric values will result in a compile time error
- Division of a integer value by zero will result in a RuntimeException (ArithmeticException of trying to divide by zero)
- Division of a floating type value by zero will result in infinity for non-zero numerator and NaN (Not a Number) if the numerator is 0

Hope that helps!

[Henry Wong]

And don't forget...

System.out.println(0.0 / (-4.0));

Henry

[Larry Olson]

Hi Henry

System.out.println(0.0 / (-4.0));

Good. But there is no trick in that, right? i.e. it is assumed everyone understands that! May be that is the reason Sahil didn't include that in the posted code

[Abhinav Yadav]

1). infinity
2). ArithmeticException
3). Compile time error
4). infinity
5). -infinity
6). -infinity
7). ArithmeticException
8). NaN(not a number)
9). NaN(not a number)
10). compile time error

[Henry Wong]

Larry Olson wrote:

System.out.println(0.0 / (-4.0));

Good. But there is no trick in that, right? i.e. it is assumed everyone understands that! May be that is the reason Sahil didn't include that in the posted code

Hint: The answer is something that behaves slightly different from zero.

[Henry Wong]

Before this topic fades to the next page....

Henry Wong wrote:

Larry Olson wrote:

System.out.println(0.0 / (-4.0));

Good. But there is no trick in that, right? i.e. it is assumed everyone understands that! May be that is the reason Sahil didn't include that in the posted code

Hint: The answer is something that behaves slightly different from zero.

The answer is negative zero. This value is slightly different from the normal zero...

http://en.wikipedia.org/wiki/Signed_zero

The sign is maintained, so if further math is done, such as it is used as the divisor to any positive dividend, the quotient is negative infinity.

Henry

[Sahil Kapoor]

It was really important !!!

Thanks Henry !!!