Re: OT Remainder Operation

[Jeff Beal]

You can't use the == operator with doubles reliably.  The values are 
often imprecise.  Due to rounding, you may be comparing 
0.000000000000001 to 0, and those are not equal.

Change
  if (res == 0)
to
  if (Math.abs(res) <= 0.000000001)
You can probably just declare res as an int, also:
 int res = (int)(diff % inc);
-- Jeff
Phani wrote:
Sorry this is not a struts question..more anlytical..
I have this simple program where I want to check
whether the division operation returns a whole number
or not...For this purpose I am actually checking
whether the remainder is zero..which fails for a
particular case..
Here is my program below..Hope to get any help ..
Thanks.
public class ROPTest {
        public double d1 = 0.0;
        public double d2 = 1.0;
        public double inc = 0.1;
        public double diff;
        public double res;
        public ROPTest() {
        }
        /* This function is to verify whether the division
operation -->  diff/inc returns a whole number or not
*/
        public void compute() {
            double diff = d2 - d1;
            res = diff%inc;
        if(res == 0)
        System.out.println("The Result is Zero:
"+res);
        
        else
        System.out.println("The Result is not Zero:
"+res);
}
    public static void main(String args[]) {
 		ROPTest rt = new ROPTest();
		rt.compute();
	}
}
 

		
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