Question

Write a code segment as specified below.

// 1. Prompt the user to enter a positive integer number (say n).

// 2. Calculate the sum of all the reciprocals of the numbers from 1 to n.

For example, sum = (1 / 1) + ( 1 / 2 ) + ( 1 / 3) + ( 1 / 4 ) + … + ( 1 / n )

// 3. Print out the integer number and the sum.

• NOTE: Each reciprocal should not truncate decimal point numbers (i.e., 1 / 2 == 0.5, 1 / 4 == 0.25, etc.). Recall cast operator(s).

Answer 1

import java.util.Scanner;

public class Tester {

      public static void main(String[] args) {

            Scanner scan = new Scanner(System.in);

            //Asking the user to enter n

            System.out.print("Enter n: ");

            int n = scan.nextInt();

            double sum =0;

            //Calculating the sum of reciprocals

            for (int i=1; i<=n; i++){

                  double temp = (double)1/i;

                  sum += temp;

            }

            //Printing out the result

            System.out.print("Sum = "+sum);

            scan.close();

      }

}

output: