Type Casting

[Anonymous]

class Cast
{
public static void main(String args[])
{
float f = 1.1f;
float f1= 1.1f;
double f2 ;
f2 = f + f1;
System.out.println(f2);
}
}
Try this program, i was expecting the output as 2.2 but i am getting it as 2.200000047683716. Can anybody explain this???
Thanks,
Subba Rao

[Michael Ernest]

This is interesting. I ran this code on the system in front of me, an UltraSPARC 10/Solaris 8 running JDK 1.2.1_04c, and got exactly the same result you did.
I don't have an explanation just yet -- I don't dabble in the numeric types as much as I should -- but I think we can rule out platform-specific issues or some kind of initialization problem.
-----------------
Michael Ernest, co-author of:

The Complete Java 2 Certification Study Guide


[This message has been edited by Michael Ernest (edited December 22, 2000).]

[bill bozeman]

Floats and Doubles have low precision so that the numbers are not always exactly what you would expect them to be after you do mathematical calculations on them.
Bill

[Anonymous]

Thanks Bill and Michael.
Subba Rao

[karan roy]

it is true that a float has a low precision but i am not too sure about the double b'coz this is where double scores over float-accuracy
whenever the literal values are too big or too small the answer in a float datatype might lose accuracy but i think this is not the same in case of double
double shows accurate values.
this is got nothing to do with casting