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WestCoast WestCoast - 6 months ago 42
Java Question

Expression must be an array, but ... to double

I am trying to practice writing some code and I can't solve my problem here.
I keep getting for "double sideA,sideB,sideC" that the expression must be an array, but it resolved to double.

public static double Calculate (double array1, double array2, double array3) {



            double sideA = Math.sqrt(((array2[0]-array3[0])^2)+((array2[1]-array3[1])^2)+((array2[2]-array3[2])^2));

            double a= Math.abs(sideA);

            double sideB = Math.sqrt(((array1[0]-array3[0])^2)+((array1[1]-array3[1])^2)+((array1[2]-array3[2])^2));

            double b= Math.abs(sideB);

            double sideC = Math.sqrt(((array2[0]-array1[0])^2)+((array2[1]-array1[1])^2)+((array2[2]-array1[2])^2));

            double c= Math.abs(sideC);

            double s = ((0.5) * (a + b + c));

            return Math.sqrt(s * (s - a) * (s - b) * (s - c));

    }


so can someone please help?

Louis Wasserman Louis Wasserman
Answer

array1, despite the name, is not actually an array as you've written the code right now. As you've written it, array1 is just a single number.

Instead, it should be 

public static double calculate(double[] array1, double[] array2, double[] array3) {

(Also, ^ does not do what you think it does; you would need Math.pow. On the other hand, you can just write Math.hypot(array2[0] - array1[0], array2[1] - array1[1]).)

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