Question

Using switch statement, write a menu driven program for the following:

i) To find and display the sum of the series given below:
S = x¹ – x²+ x³ – x⁴ + x⁵ … – x²⁰
(where x=2)

ii) To display the following series:
1 11 111 1111 11111
For an incorrect option, an appropriate error message should be displayed.

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Code

				
					import java.util.Scanner;

public class program6
{
	public static void main(String[] args)
	{
	    int choice=0,i=0,j=0;
	    double sum=0;
	    System.out.println("Press 1 for Sum of series");
	    System.out.println("Press 2 to Display Series");
            System.out.print("Enter your choice: ");
	    Scanner sc = new Scanner(System.in);
	    choice = sc.nextInt();
	    switch (choice)
	    {
		    case 1:
                    sum = 0;
                    for (i = 1; i <= 20; i++)
                    {
                        if (i % 2 == 0)
                        {
                            sum = sum - Math.pow(2, i);
                        }
                        else
                        {
                            sum = sum +Math.pow(2, i);
                        }
                    }
                    System.out.println("Sum = " + sum);
                    break;
		    case 2:
		        int temp =0;
		        for (i = 1; i<= 5; i++)
		        {
			        temp=temp*10+1;
			        System.out.print(temp+" ");
		        
		        }
		        break;
		    default:
		        System.out.println("Invalid choice");
		        break;
	    }
    }
}