I'm working on a program that will take user input to display how much change you have, a friend has, and you have together. The code is below.

My problem is in my output. The output file shows the following:
You have $-8.58993e+008.
Your friend has $-8.58993e+008.
Together you have $-1.71799e+009.

Can you tell me what is causing it?

Here is my class.
Code:
#pragma once
class change
{
private:
	int pennies;
	int nickels;
	int dimes;
	int quarters;
public:
	change(void);
	change(int p, int n, int d, int q);
	~change(void);
	void SetPennies(int p);
	void SetNickels(int n);
	void SetDimes(int d);
	void SetQuarters(int q);
	int GetPennies();
	int GetNickels();
	int GetDimes();
	int GetQuarters();
	double GetValue(change c);
	change AddCoins(change c);
};
Here is my program.
Code:
#include <iostream>
#include <fstream>
#include "change.h"
using namespace std;


void header(ofstream &outfile);
void ChangeInput(change c1, change c2);
void PrintChange(ofstream &outfile, change c1, change c2, change c3);


int main()
{
	ofstream outfile;
	outfile.open("output.txt");


	change c1, c2, c3;


	ChangeInput(c1, c2);
	c3 = c1.AddCoins(c2);


	header(outfile);
	PrintChange(outfile, c1, c2, c3);


	system("pause");
	return 0;
}


void header(ofstream &outfile)
{
	outfile << "Trey Brumley" << endl;
	outfile << "CMPS 1063-201" << endl;
	outfile << "Dr. Tina Johnson" << endl;
	outfile << "April 1, 2013" << endl;
	outfile << "Program 3 - Classes Extended" << endl;
	outfile << "This program will further demonstrate the use of classes by using a class designed to convert monetary change into cents values." << endl;
	outfile << "================================================================================================================================" << endl << endl;


	return;
}


void ChangeInput(change c1, change c2)
{
	int p, n, d, q;
	cout << "Please enter the number of coins you have (pennies, nickels, dimes, quarters):" << endl;
	cin >> p >> n >> d >> q;
	c1.SetPennies(p);
	c1.SetNickels(n);
	c1.SetDimes(d);
	c1.SetQuarters(q);


	cout << endl << "Please enter the number of coins your friend has (pennies, nickels, dimes, quarters):" << endl;
	cin >> p >> n >> d >> q;
	c2.SetPennies(p);
	c2.SetNickels(n);
	c2.SetDimes(d);
	c2.SetQuarters(q);


	return;
}


void PrintChange(ofstream &outfile, change c1, change c2, change c3)
{
	outfile << "You have $" << c1.GetValue(c1) << "." << endl;
	outfile << "Your friend has $" << c2.GetValue(c2) << "." << endl;
	outfile << "Together you have $" << c3.GetValue(c3) << "." << endl;


	return;
}


change::change(void)
{
}




change::~change(void)
{
}


change::change(int p, int n, int d, int q)
{
	pennies = p;
	nickels = n;
	dimes = d;
	quarters = q;
}


void change::SetPennies(int p)
{
	pennies = p;
}


void change::SetNickels(int n)
{
	nickels = n;
}


void change::SetDimes(int d)
{
	dimes = d;
}


void change::SetQuarters(int q)
{
	quarters = q;
}


int change::GetPennies()
{
	return pennies;
}


int change::GetNickels()
{
	return nickels;
}


int change::GetDimes()
{
	return dimes;
}


int change::GetQuarters()
{
	return quarters;
}


double change::GetValue(change c)
{
	double total;


	total = c.pennies+(5*c.nickels)+(10*c.dimes)+(25*c.quarters)/100.0;


	return total;
}


change change::AddCoins(change c)
{
	change ch;
	ch.pennies = pennies + c.pennies;
	ch.nickels = nickels + c.nickels;
	ch.dimes = dimes + c.dimes;
	ch.quarters = quarters + c.quarters;


	return ch;
}