+500
 



C# program to print sum of series

Program Statement:
Write a program to display the sum of the following series using loop.
1*x + 2*x2 + 3*x3 + 4*x4 + 5*x5 + … + n*xn

Solution:
 static void Main(string[] args)
        {
            int j, n = 1, x, lastn, sum = 0, prod = 1;
            Console.WriteLine("Enter last digit:");
                lastn=Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("Enter value of x:");
                x = Convert.ToInt32(Console.ReadLine());
                for (j = 1; j <= lastn; j++)
                {
                    n = n * x;
                    prod = n * j;
                    sum = sum + prod;
                }
                Console.WriteLine("Sum of Series 1*x + 2*x2 + 3*x3 + 4*x4 + 5*x5 + … + n*xn when n=:  " + n +" and x= "+ x+ "sum= "+ sum);
                Console.ReadLine();
        }
 



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