Only return a decimal if it's not a whole number

Question

I've been trying to write a function isWhole that is given a double and looks to see if it's a whole number, and if it is return the value without the decimal (as an int?) else return it with 3 decimal places (I can do this part with number format.

My question is how can I check if a double is a whole number and even a recursive decimal?

Answer 1

[UPDATE] returns value - with 3 decimal places

public boolean isWhole(double value) {
    return Math.floor(value) == value;
}

• You can't have a function that returns either int or double
• To convert double to int; simply typecast :- int valueInt = (int) valueDouble;