Program to demonstrate how to find sum of N number of terms in a Harmonic Progression in Java
package com.hubberspot.example;
import java.util.Scanner;
public class HarmonicProgression {
public static void main(String[] args) {
// Create a Scanner Object to obtain
// User Input from console
Scanner scanner = new Scanner(System.in);
System.out.println("Enter the No. of terms in series : ");
// Give the total no. of terms in series in int
int noOfTerms = scanner.nextInt();
// initial sum assigned to be zero
double sum = 0.0;
// applying the formula
// as : compute (1/1 + 1/2 + 1/3 + ... + 1/N)
for (int a = 1; a <= noOfTerms; a++) {
sum = sum + 1.0 / a;
}
// printing out the Harmonic Sum of series
System.out.println("Sum of Harmonic Series is : ");
System.out.println(sum);
}
}
Output of the program : 
