Why is this code giving error?

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I do not have much to explain as I myself is a beginner in C#. However I wanted to calculalte the area of a triangle using its three sides. And the code is giving me error as CS0149 - Method Name Expected.

Following is my Code:

C#

class Q6_CalculateAreaOfTriangle
        {
            double sideA = double.Parse(Console.ReadLine());
            double sideB = double.Parse(Console.ReadLine());
            double sideC = double.Parse(Console.ReadLine());

            public static void FindAreaWith3Sides(double sideA, double sideB, double sideC)
            {
                double perimeter = (sideA + sideB + sideC) / 2;
                double pSubSidA = perimeter - sideA;
                double pSubSidB = perimeter - sideB;
                double pSubSidC = perimeter - sideC;
                double areaRaw = perimeter(pSubSidA * pSubSidB * pSubSidC); //Here is where it gives me problem. It asks to give a method. Why is it so??
                double area = Math.Sqrt(areaRaw);
            }


        }

What I have tried:

Nothing. As dont know where to start from and what to look for.

However I request to please provide an explanation in very very easy to understand English as I have not covered much in C# so the things you mention I might not even have heard of.

Thanks in advance to everyone.

Posted 28-Sep-18 0:14am

Mohit Tomar

Updated 28-Sep-18 0:39am

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Herman<T>.Instance 28-Sep-18 6:28am

perimeter is a double type variable and not a method

1 solution

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OriginalGriff · Answer 1 · 2018-09-28T00:40:00

If you double click on the error message, it will take you to the line that it found teh error on. Look at the error message, and at the code:

Method Name Expected

double areaRaw = perimeter(pSubSidA * pSubSidB * pSubSidC);

There is only one
And perimeter is a double variable:

double perimeter = (sideA + sideB + sideC) / 2;

not a method, so it looks at your code, sees this:

double variable = aName(parameter list);

and expects aName to be a method. so, it complains: you can't "call" a variable, that doesn't make any sense!

I think you need to go back to basic maths: Area of a triangle given three sides - Heron's Formula - Math Open Reference[^]
So, calculate p: (a + b + c)/2
Then area = Sqrt(p * (p - a) * (p - b) * (p -c))
You've calculated p, that's fine - but you need the multiply sign:

C#

double areaRaw = perimeter * (pSubSidA * pSubSidB * pSubSidC);