CODEWITHSUNDEEP
c#
TGFoxy
TGFoxy

Reputation: 25

How to incrementally increase a variable using an equation in c#?

sorry if this is quite a simple question, I am just currently in the process of teaching myself C#.


            foreach(int n in Enumerable.Range(0, Range)) {

                double s += (1 / Math.Pow(n, 2));
                double s6 = s * 6;
                double pi = Math.Sqrt(s6);

                Console.WriteLine("Pi is equal to {0}", pi);
            }

This returns the error "invalid expression term '+='".

I previously wrote a program in python which performs the same task however, I want the line;

double s = (1 / Math.Pow(n, 2));

to add to itself while the foreach loop is true, in a similar fashion to my python variation;

s  += 1/n**2;

Thanks in advance for any help!

Upvotes: 0

Views: 65

Answers (2)

DerSchnitz
DerSchnitz

Reputation: 467

As mentioned in the comments, there is a scope issue. s must be declared outside the loop and set an initial value to use += in the intended way.

double s = 0;
foreach(int n in Enumerable.Range(0, Range))
{
    s += (1 / Math.Pow(n, 2));
    double s6 = s * 6;
    double pi = Math.Sqrt(s6);
    Console.WriteLine("Pi is equal to {0}", pi);
}

Upvotes: 3

Richard Hubley
Richard Hubley

Reputation: 2320

Just need to initialize it first.

double s = 0;
foreach(int n in Enumerable.Range(0, Range)) {

            s += (1 / Math.Pow(n, 2));
            double s6 = s * 6;
            double pi = Math.Sqrt(s6);

            Console.WriteLine("Pi is equal to {0}", pi);
        }

Upvotes: 1

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