Distance formula in java printing NaN -- How do I fix this?

Okay, so I'm using the distance formula to print out the distance between two player objects from inside one of the player ob开发者_运维问答jects (With "other" being another Player object). How can I get it to just print the number without getting a "NaN"?

System.out.println("D = " + Math.sqrt(Math.pow(x - other.x, 2) - Math.pow(-(y - other.y), 2)));

You're trying to take the square root of a negative number. Add the squares, don't subtract them.

Also, negating y - other.y is unnecessary, though harmless. value² is the same as (-value)² for all numbers.

System.out.println("D = " + Math.sqrt(Math.pow(x - other.x, 2) + Math.pow(y - other.y, 2)));
//                                                            ^^^