C Program to print sum of the factorial of odd series multiply with x where power of x is square of corresponding number

C# Program to print sum of the factorial of odd series multiply with x where power of x is square of corresponding number

Program Statement:

Write a program to display the sum of the following series i.e. sum of the factorial of odd series multiply with x where power of x is square of corresponding number.

X1*1! + X9*3! + X25*5! + X49*7! + X81*9! + . . . + Xn2*n!

Solution:

 class _power
 {
 long n, f, x, sum = 0;
 public long power(long a, long b)
 {
 long res = 1;
 for (int i = 1; i <= b; i++)
 res = res * a;
 return res;
 }
 public void cal()
 {
 Console.WriteLine(" Series X^1*1! + X^9*3 +...+X^n2*n! ");
 Console.Write(" Enter value of x : ");
 x = Convert.ToInt32(Console.ReadLine());
 Console.Write(" Enter ending point : ");
 n = Convert.ToInt32(Console.ReadLine());
 for (int i = 1; i <= n; i++)
 {
 if (i % 2 != 0)
 {
 f = 1;
 for (int j = i; j >= 1; j--)
 f = f * j;
 sum = sum + ((power(x, i * i)) * f);
 }
 }
 Console.WriteLine(" Result = {0} ", sum);
 }
 } 

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