how to check if a double is exact multiple of an increment value

[premkumar bhaskal]

Hi,
I want to check if a given double number is multiple of any given increment value.
Eg. i want to check if number 2.3 is a multiple of 0.01.
For this i wrote the following code.

	double dividend = 2.3;
	double divisor = 0.01;
	double result;

	result = dividend / divisor;

	System.out.println("the result is " + result);

	if (result % 1.0 == 0) {
	    System.out.println("the number " + dividend
		    + " is exactly divisble");
	} else {
	    System.out.println("the number " + dividend
		    + " is not exactly divisble");
	}

.
but i am getting the below result:
the result is 229.99999999999997
the number 2.3 is not exactly divisble

Can someone suggest a better and robust way to check the multiplicity of double values, which will work for any double values.

Thanks & Regards

[Rob Spoor]

Use BigDecimal, or use int / long to represent the double times X (with X being some power of 10). float and double simply are never accurate enough; see item #20 of our beginners FAQ for more info.