public class Main {

    public static void main(String[] args) {
        double a;

        a = triangleArea(3, 3, 3);
        System.out.println("A triangle with sides 3,3,3 has an area of " + a );

        a = triangleArea(3, 4, 5);
        System.out.println("A triangle with sides 3,4,5 has an area of " + a );

        a = triangleArea(7, 8, 9);
        System.out.println("A triangle with sides 7,8,9 has an area of " + a );

        System.out.println("A triangle with sides 5,12,13 has an area of " + triangleArea(5, 12, 13) );
        System.out.println("A triangle with sides 10,9,11 has an area of " + triangleArea(10, 9, 11) );
        System.out.println("A triangle with sides 8,15,17 has an area of " + triangleArea(8, 15, 17) );
        System.out.println("A triangle with sides 9,9,9 has an area of " + triangleArea(9, 9, 9));
        //It is easier to add a new call to the code with the formula, instead of having to manually re-do all the calculations in code.
    }

    public static double triangleArea( int a, int b, int c )
    {

        double s, A;

        s = (a+b+c) / 2.0;
        A = Math.sqrt( s*(s-a)*(s-b)*(s-c) );

        return A;

        //Both the code with the formula and the one without the formula give the same results
        //No Formula has 38 lines of code, Formula has 15 lines of code
        //It's easier to alter the calculations when the code is in a formula format, due to it needing to be changed only once instead of every time you need to use the formula.
    }