Mock Question

[tanu dua]

Hi all !

Can anyone plz explain the output of the following program :

  
public class exp
 {
 public static void main(String args[])
  {
   double d1=1.0;
   double d2=0.0;
   byte b=1;
   d1=d1/d2;
   System.out.println(d1);
   b=(byte)d1;
   System.out.println(b);
  }
  
  }
 

Output :
INFINITY
-1
Problem:
How infinity is converted to -1 while casting.

Thanx

[Tybon Wu]

When casting double to byte, the value of the double is converted to an int first, and then from int to byte.

So, when you convert infinity to int, you get 0x7fffffff. When you convert 0x7fffffff to byte, you get 0xff, which is -1.

[tanu dua]

Thanx mate !!

You have cleared my doubts ...