Help me with functions please?

[Mavs25]

Hey guys, I'm trying to output the statements from the "void storeCalculations(char requiredorsugg, char neworold, double possibilityconc)" but when I try to run it, it only reads the int main() and skips over the next function void help pls? I even called it in the int main (last line) but it still won't read the next void function

  
#include <iostream>
#include <cstdlib>
#include <iomanip>
#include <string>
#include <cctype>
using namespace std;
#define storepercent = 0.8

//Declaring other functions other than main
void storeCalculations(char, char, double);
void output(double);


int main()
{
	//Holds the user's input
	string ISBN;
	double pricepercopy, possibilityconc;
	char requiredorsugg, neworold;
	int classsize;

	//Asks for the User's Input
	cout << "What is the ISBN?" << endl;
	cin >> ISBN;

	cout << "What is the price per copy?" << endl;
	cin >> pricepercopy;

	cout << "What is the class size?" << endl;
	cin >> classsize;


	cout << "Is the book required or suggested? (R/S):  " << endl;
	cin >> requiredorsugg;
	requiredorsugg = toupper(requiredorsugg);
	if (requiredorsugg != 'R' && requiredorsugg != 'S')
	{
		cout << "ERROR: Must type R or S" << endl;
		system("pause");
		exit(100);
	}

	cout << "Is the required or suggested book will be new or old? (N / O):" << endl;
	cin >> neworold;
	neworold = toupper(neworold);
	if (neworold != 'N' && neworold != 'O')
	{
		cout << "ERROR: Must type N or O" << endl;
		system("pause");
		exit(100);
	}

	system("pause");
	void storeCalculations(char requiredorsugg, char neworold, double possibilityconc);
}

void storeCalculations(char requiredorsugg, char neworold, double possibilityconc)
{
	if ((requiredorsugg == 'R') && (neworold == 'N'))
	{
		possibilityconc = 0.90;
	}

	if ((requiredorsugg == 'R') && (neworold == 'O'))
	{
		possibilityconc = 0.65;
	}

	if ((requiredorsugg == 'S') && (neworold == 'N'))
	{
		possibilityconc = 0.40;
	}

	if ((requiredorsugg == 'S') && (neworold == 'O'))
	{
		possibilityconc = 0.20;
	}
	cout << possibilityconc << endl;
}

[ne555]

A function call: system("pause");
A function declaration (not a call): void storeCalculations(char requiredorsugg, char neworold, double possibilityconc);