C and C++ program to find the sum of exponential series

This is a simple C++ program which will show how to find the sum of series which are exponential in nature. Given below is one of the sample program

#include "iostream.h"
#include "math.h"
#include "conio.h"
// The function is
double SumSeries(double x, int m)
{
double s = 1/x;
float xpower, factVal, fact;
int i, j;
  for(i=0;i<=m;i++)
{
xpower = 1;
for (j=2; j<=i; j++)
   xpower = xpower * x;
  factVal = i + 1;
  fact = 1;
  for (j=1; j<=factVal; j++)
   fact = fact * j;
  if ((i % 2) == 0)
   s = s - (fact/xpower);
  else
   s = s + (fact/xpower);
 }
 return(s);
}
void main()
{
 clrscr();
 int  m;
 double sum = 0;
 double x;
 cout << "Enter the value of x : ";
 cin >> x;
cout << "Enter the value of m : ";
 cin >> n;
sum = SumSeries(x, m);
cout << "The sum of series is : " << sum;
}

Source: www.LearnCandCpp.com

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