Question

The sum of first n odd natural numbers can be calculated as n², where n is the number of odd natural.

For example,
Sum = 1 + 3 + 5 + 7; number of odd natural = 4
Therefore, Sum = 4² = 16

Write a program to input number of odd natural terms and display sum of the given series:

1. 1 + 3 + 5 + .......... + 29 + 31
2. 1 + 3 + 5 + 7 + .......... + 47 + 49

Answer 1

import java.util.*; 
public class KboatCalculateSum
{

    public static void main(String args[]) 
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter the number of odd natural terms: ");
        int num = in.nextlnt();

        System.out.println("Number of odd natural terms = " + num);

        double sum = Math.pow(num, 2); 
        System.out.println("Sum = " + sum); 

    }
}