How to find out if a number ends in .5 or .0

Question

I was just wondering if you guys could help me out with a problem?.

double num = 2.0

if(num%1 != 0)
{
   System.out.println("hi");


}
else if(num%.5 != 0)
{
   System.out.println("hi there");


}

basically i want to make sure a number the user enters ends with .0 or .5.....but i am having trouble figuring it out. The above "solution" is what i came up with but it doesnt seem to work. Any pointers?, im relatively new to programming by the way so any help would be greatly apprecaited.

Answer 1

The % operator works on the floating-point types float and double as well as the integral types in Java. Any number that ends in ".0" or ".5" is divisible by 0.5 .

if (num % 0.5 == 0)
{
    System.out.println("Ends in .0 or .5!");
}

Answer 2

try this

    if (num - Math.rint(num) == 0) {
        System.out.println("hi");
    } else if (Math.abs(num - Math.rint(num)) == 0.5) {
        System.out.println("hi there");
    }