Problem 100

Distance Formula

Write a function to compute the distance between two points. Given two points (x1, y1) and (x2, y2), the distance between these points is given by the formula:

the distance formula

You must name the function distance, and it must return a double giving the distance between the two points.

Files Needed: DistanceFormula.java

public class DistanceFormula {
    public static void main(String[] args) {
        // test the formula a bit
        double d1 = distance(-2,1 , 1,5);
        System.out.println(" (-2,1) to (1,5) => " + d1);
 
        double d2 = distance(-2,-3 , -4,4);
        System.out.println(" (-2,-3) to (-4,4) => " + d2);
 
        System.out.println(" (2,-3) to (-1,-2) => " + distance(2,-3,-1,-2));
        System.out.println(" (4,5) to (4,5) => " + distance(4,5,4,5));
    }
 
    public static double distance(int x1, int y1, int x2, int y2) {
        // put your code up in here
    }
}

What you should see

 (-2,1) to (1,5) => 5.0
 (-2,-3) to (-4,4) => 7.280109889280518
 (2,-3) to (-1,-2) => 3.1622776601683795
 (4,5) to (4,5) => 0.0

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