SPECIAL SERIES

import java.util.*;

public class sumseries {
public static void main(String[] args) {
double sum=0; double pow =0.0;
Scanner sc = new Scanner(System.in);
System.out.println("ENTER THE CHOICE '1' or '2' : " );
int choice = sc.nextInt();
switch(choice)
{
case 1:
System.out.println("YOU HAVE ENTERED CHOICE 1 ");
System.out.println("ENTER THE VALUE OF n : ");
int n= sc .nextInt();
for (int i=1;i<=n;i+=4)
{
sum =sum-( 1.0/i);
}
for(int i = 3; i<=n; i+=4)
{
sum=sum-(1.0/i);
}
System.out.println(sum);
break;
case 2:
System.out.println("YOU HAVE ENTERED CHOICE 2");
System.out.println("ENTER THE VALUE OF 'y' ");
int y =sc.nextInt();
for(int i=2;i<=10;i+=2)
{
pow+=Math.pow(y,i);
}
System.out.println(pow);
}
}
}