Question

find the summation of the sequence of number 1,2,3...n,where n ranges from 1 to 100.use type long.Display the results in a tabular format that shows n and the corresponding sum. If this were a product instead of sum, what difficulty might you encounter with the variable that accumulates the product?

Answer 1

import java.util.Scanner;

public class DisplaySum {

        public static void main(String[] args) {

                Scanner in = new Scanner(System.in);

                System.out.println("Enter value of n: ");
                int n = in.nextInt();

                long sum = 0;

                System.out.printf("\n\n%-10s%-20s\n", "Terms", "Sum");
                for (int i = 1; i <= n; i++) {
                        sum += i;
                        System.out.printf("%-10d%-20d\n", i, sum);
                        
                }
        }

}

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If instead of sum, we take product, then the value of long will very easily be filled.. Like if we take n=20, We will have around 15-16 zeroes at the end of the product.. which will easily fill the range of the long values

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