Java Program to Generate Harmonic Series

22 Jun, 2021
Harmonic series is the inverse of an arithmetic progression. In general, the terms in a harmonic progression can be denoted as
h1 = 1/a,  h2 = 1/(a+d), h3 = 1/(a+2d), h4 = 1/(a+3d), .................,  hn = 1/(a+nd).
Where h is the harmonic series, a is arithmetic progression and d is the common difference between arithmetic progression and n is the nth term.
Example 1: (Using while loop)
Java
// Java Program to Generate Harmonic Series class HarmonicSeries {     // this is a main function    public static void main(String args[])    {         // num is the number of values we want in a series        int num = 5;        double result = 0.0;         System.out.println("The harmonic series is: ");         // printing the harmonic series till num value        // using while loop        while (num > 0) {             // calculating harmonic values            result = result + (double)1 / num;             // after calculating harmonic value            // decrementing num by 1 which means the common            // difference is 1            num--;            System.out.print(result + ", ");        }    }}
The harmonic series is: 
0.2, 0.45, 0.7833333333333333, 1.2833333333333332, 2.283333333333333,
Example 2: (Using for loop) 
Java
// Java Program to Generate Harmonic Series class HarmonicSeries {     // this is a main function    public static void main(String args[])    {         // num is the number of values we want in a series        int num = 5;        double result = 0.0;         System.out.println("The harmonic series is: ");         // printing the harmonic series till num value        // using for loop        for (int i = num; i > 0; i--) {             // calculating harmonic values            result = result + (double)1 / i;            System.out.print(result + ", ");        }    }}
The harmonic series is: 
0.2, 0.45, 0.7833333333333333, 1.2833333333333332, 2.283333333333333,
Example 3: 
Java
// Java Program to Generate Harmonic Series // importing necessary java packagesimport java.util.Scanner;import java.lang.*; class HarmonicSeries {     // this is a main function    public static void main(String args[])    {         // scanner class is a pre-defined class in java        // for taking input from keyboard        Scanner in = new Scanner(System.in);         System.out.print("Enter Number: ");         // storing input value in num        int num = in.nextInt();        double result = 0.0;         System.out.println("The harmonic series is: ");         // printing the harmonic series till num value        // using for loop        for (int i = num; i > 0; i--) {             // calculating harmonic values            result = result + (double)1 / i;             System.out.print(result + ", ");        }    }}
Output 
$ javac HarmonicSeries.java
$ java HarmonicSeries

Enter Number: 5
The harmonic series is: 
0.2, 0.45, 0.7833333333333333, 1.2833333333333332, 2.283333333333333
$ javac HarmonicSeries.java
$ java HarmonicSeries

Enter Number: 6
The harmonic series is: 
0.16666666666666666, 0.3666666666666667, 0.6166666666666667, 0.95, 1.45, 2.45
 
arorakashish0911
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