Thread: Why is the som of this these two not correct

I have the code bellow and I get as output:
30.299999999999997
30

Why is the output:30.299999999999997 and not 30.3?

public class demo {
	private static double som(double a, double b) {
		return a+b;
	}
 
	private static int som(int a, int b) {
		return a+b;
	}
 
	public static void main(String args[]) {
		System.out.println(som(20.20,10.10));
		System.out.println(som(20,10));
 
	}
}

Originally Posted by John Joe

Explanation here:

https://docs.oracle.com/javase/tutor...datatypes.html

The double data type is a double-precision 64-bit IEEE 754 floating point. Its range of values is 4.94065645841246544e-324d to 1.79769313486231570e+308d (positive or negative). For decimal values, this data type is generally the default choice. As mentioned above, this data type should never be used for precise values, such as currency.

What should I use instead?