# Program to find sum of 1 + x/2! + x^2/3! +…+x^n/(n+1)! in C++

C++Server Side ProgrammingProgramming

In this problem, we are given two values x and n that corresponds to the given series. Our task is to create a program to find sum of 1 + x/2! + x^2/3! +…+x^n/(n+1)! in C++.

Problem description − we need to find the sum of series based on the given values of x and n. In the series, every other term differs from the previous term by x/i for ith term.

Let’s take an example to understand the problem

## Input

x = 6, n = 4

## Output

29.8

## Explanation

The sum of the series is

1 + 6/2 + 36/6 + 216/24 + 1296/120 = 29.8

## Solution Approach

To find the sum of the series, we will find the nth term by multiplying the previous term by the x/i. And find the sum by adding all terms.

Program to illustrate the solution

## Example

Live Demo

#include <iostream>
using namespace std;
float calcSeriesSum(int x, int n){
float sumVal = 1, term = 1;
for(float i = 2; i <= (n + 1) ; i++){
term *= x/i;
sumVal += term;
}
return sumVal;
}
int main(){
int x = 6, n = 4;
cout<<"The sum of the series is "<<calcSeriesSum(x, n);
return 0;
}

## Output

The sum of the series is 29.8