/*Name: Yang, Howie
*CS101 - Fall 2017
*Homework 4.1
*Description: Program returns sum of alternating harmonic values.
*/

#include "std_lib_facilities.h"

double altharmsum(unsigned int n)
{
    double sum = 1.0;
    double sign = -1.0;

    for (int i=2; i<=n; i++) {
        sum += sign * (1.0/i);
        sign *= -1.0;
    }
    return sum;
}

int main()
{
    double x;
    unsigned int n = 0;
    cout << "Enter length of harmonic series: ";
    while (cin >> n) {
        x = altharmsum(n);
        cout << "The sum is: " << x << endl;
    }

    return 0;
}