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


i trying practice writing code , can't solve problem here. keep getting "double sidea,sideb,sidec" expression must array, resolved 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 please help?

array1, despite name, not array you've written code right now. you've written it, array1 single number.

instead, should 

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

(also, ^ not think does; need math.pow. on other hand, can write math.hypot(array2[0] - array1[0], array2[1] - array1[1]).)


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