[FIXED] Java how to check float minus float is integer?

Issue

For example, float a is 2.15, float b is 1.15, but a-b will be 1.0000001,

My first question is how to get the right answer 2.15-1.15=1?

My second question is how to check the result of a minus b is an integer?

Solution

1. You can either still using float and round the result, or use double instead.
2. If you mean the result has no fraction (decimal part) you can check with % 1 == 0. It should give you true.

Something like:

public class MyClass {
    public static void main(String args[]) {
      double x = 2.15;
      double y = 1.15;
      double z = x - y;

      System.out.println("Sum of x-y = " + z);
      System.out.println("Sum of x-y = " + Math.round(z));
      System.out.println("Sum of x-y = " + (z % 1 == 0));
    }
}

Answered By - dk_016
Answer Checked By - Senaida (JavaFixing Volunteer)