Writing an equation

Question

I'm not sure how to write an equation in Netbeans. The equation is supposed to be: (5−x)^2 +(5−y)^2 all under a square root.

This is what I have tried:

public static int getScore(int x, int y){
   return ( (((5-x)^2 + (5-y)^2))^(1/2) );

Look into Math.pow and Math.sqrt. Also, consider using double variables and return type instead of int. — Eran, Mar 02 '16 at 06:17
^ performs XOR in Java. See this: http://stackoverflow.com/questions/1991380/what-does-the-operator-do-in-java — bane, Mar 02 '16 at 06:18

Joni · Answer 1 · 2016-03-02T06:26:51.837

8

This is one of those cases where there's a specialized library function:

return Math.hypot(5-x, 5-y);

This avoids the overflow and underflow issues in computing the square root of the sum of squares directly

edited Mar 02 '16 at 06:26

answered Mar 02 '16 at 06:20

Joni

Do I have to import something to use this function? – Jordon Mar 02 '16 at 06:31
1

No need to import anything: Math is in the `java.lang` package which is imported automatically. – Joni Mar 02 '16 at 06:35

score 1 · Answer 2 · answered Mar 02 '16 at 06:20

1

The carat ^ performs exclusive or operator in java, which is a bits thing. Don't use it for exponents.

The expression you are looking for is

return Math.sqrt(Math.pow(5 - x, 2) + Math.pow(5 - y, 2)));

answered Mar 02 '16 at 06:20

2 Answers2