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Posted to user@struts.apache.org by Phani <ph...@yahoo.com> on 2004/11/19 19:06:14 UTC

Remainder Operation

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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Re: OT Remainder Operation

Posted by Jeff Beal <jb...@webmedx.com>.
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();
> 	}
> }
>  
> 
> 
> 		
> __________________________________ 
> Do you Yahoo!? 
> The all-new My Yahoo! - Get yours free! 
> http://my.yahoo.com 


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