Thread: How to get the fractional part of this number without so much precision?

Hey guys,

I have a number type double and want to split it up into its integer and fractional parts. For example, if I have 3.45 i want a variable that has 3 and another one that has 45.

I have an idea of how to do it, so I started writing. However, I get the following:

double num = 3.45;
		double integerPart = Math.floor(num);
		System.out.println(integerPart);
		double fractionalPart = num - integerPart;
		System.out.println(fractionalPart);

Output:

3.0
0.4500000000000002

When I subtract 3.45 - 3, I get 0.4500000000000002 instead of just 0.45. How can I get that 0.45? Am I doing something wrong?

Thank you!

Then is there a way that I can extract the fractional part away from that double? My main objective is, if I have an imported double variable with any value, say 3.45, then somehow get a variable with the value 45 in it (without the 0. in front).

If you want a simple solution for numbers with only a limited number of digits after the dot then you can always use multiplication.
Say, if you already know that your number will never have more then 2 digits after the floating point then you can do:

int fractionalPart = ((int) (num * 100)) - integerPart;

Which should give you the correct result in pretty much every case for 2 digits.