Question

A class SeriesSum is designed to calculate the sum of the following series:
Sum=(x2 / 1!)+(x4 / 3!)+(x6 / 5!)+….(xn /(n- 1)!)
Some of the members of the class are given below:
Classname:SeriesSum
Data members / instance variables:
x:to store an integer number
n:to store number of terms
sum:to store the sum of the series
Member functions:
SeriesSum(int xx,int nn):constructor to assign x=xx and n=nn
double findfact(int m):to return the factorial of m using recursive technique.
double findpower(int x,int y):to return x raised to the power of y using recursive technique.
void calculate():to calculate the sum of the series by invoking the recursive functions respectively
void display():to display the sum of the series
Specify the class SeriesSum, giving details of the constructor(int, int),double findfact(int), double findpower(int , int), void calculate( ) and void display(). Define the main() function to create an object and call the functions accordingly to enable the task.

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Code

				
					import java.util.Scanner;
public class SeriesSum
{
    int x,n;
    double sum;
    SeriesSum(int xx,int nn)
    {		
        x=xx;
        n=nn;
        sum=0.0;
    }
    
    double findfact(int a)
    { 
        if(a==1)
        {
            return 1;
        }
        else
        {
            return a* findfact(a-1);
        }

    }
    
    double findpower(int a,int b)
    { 
        if(b==0)
        {
            return 1;
        }
        else
        {
            return a* findpower(a,b-1);
        }

    }
    
    void calculate()
    { 
        int k=2;
        for(int i=1;i<=n;i++)
        {
            sum+=findpower(x,k)/findfact(k-1);
            k=k+2;
        }
    }
    
    void display()
    {
        System.out.println("sum="+sum);
    }
    
    public static void main()
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("ENTER A NUMBER");
        int a=sc.nextInt();
        System.out.println("ENTER  NUMBER OF TERMS");
        int b=sc.nextInt();
        SeriesSum obj1=new SeriesSum(a,b);
        obj1.calculate();
        obj1.display();
    }
}