Java program to find the sum of a Series 1/1! + 2/2! + 3/3! + 4/4! +…….+ n/n!

Write a java program for a given series 1/1! + 2/2! + 3/3! + 4/4! +…….+ n/n!, find out the sum of the series till nth term.

Examples:

Input: n = 5
Output: 2.70833

Input: n = 7
Output: 2.71806

Below is the implementation of the above approach:

Java

// Java program to print the sum of series

import java.io.*;
import java.lang.*;

class GFG {
    public static double sumOfSeries(double num)
    {
        double res = 0, fact = 1;
        for (int i = 1; i <= num; i++) {
            /*fact variable store factorial of the i.*/
            fact = fact * i;

            res = res + (i / fact);
        }
        return (res);
    }

    public static void main(String[] args)
    {
        double n = 5;
        System.out.println("Sum: " + sumOfSeries(n));
    }
}

// Code contributed by Mohit Gupta_OMG <(0_o)>

Output

Sum: 2.708333333333333

Time Complexity: O(n)
Auxiliary Space: O(1)

Please refer complete article on Program to find the sum of a Series 1/1! + 2/2! + 3/3! + 4/4! +…….+ n/n! for more details!