Как делить деньги?

#include <iostream>
using namespace std;
 
 
           void compute_coins(int coin_value, int& num, int& amount_left);
           int number_of_quarters(int quantity, int coin_value);
           int number_of_dimes(int& quantity, int coin_value, int& amount_left);
           int number_of_pennies(int& quantity, int coin_value, int& amount_left);
     
int main( )
{
    using namespace std;
    int coin_value, num, amount_left, quantity;
    
    int num1, num2, num3;
 
    
          
    cout << "Please enter a number of pennies from 1 to 99 .\n"
         << "(or zero to quit): ";
    cin >> quantity;
    
    cout << endl; 
    
   
    num1 = number_of_quarters(quantity, coin_value);       
    cout  << quantity << " pennies will be:\n " <<  num1 << " quarters\n "; 
    
    num2 = number_of_dimes(quantity, coin_value, amount_left);
    cout   <<  num2 << " dimes\n "; 
    
    num3 = number_of_pennies(quantity, coin_value, amount_left);
    cout   <<  num3 << " pennies\n "; 
    
     cout << endl; 
    
         do
          
         {
         cout << "Please enter a number of pennies from 1 to 99 .\n"
         << "(or zero to quit): ";
         cin >> quantity;
    
         cout << endl; 
    
   
         num1 = number_of_quarters(quantity, coin_value);       
         cout  << quantity << " pennies will be:\n " <<  num1 << " quarters\n "; 
    
         num2 = number_of_dimes(quantity, coin_value, amount_left);
         cout   <<  num2 << " dimes\n "; 
    
         num3 = number_of_pennies(quantity, coin_value, amount_left);
         cout   <<  num3 << " pennies\n "; 
         cout << endl; 
          
         }  while (quantity > 0);
    
    
    system("Pause");
    return 0;
}
 
       
          int number_of_quarters(int quantity, int coin_value)
           {
              int number_of_quarters;
   
              number_of_quarters = quantity/25;
              
              return (number_of_quarters);    
                
           }
   
           int number_of_dimes(int& quantity, int coin_value, int& amount_left)
           {
               int number_of_dimes;
               
               amount_left = quantity%25; 
               number_of_dimes = amount_left/10;
              
              return (number_of_dimes); 
              } 
 
              int number_of_pennies(int& quantity, int coin_value, int& amount_left)
              {
                int number_of_pennies;
                
                amount_left = quantity%25; 
                number_of_pennies = amount_left%10;
                
                return (number_of_pennies); 
                  
                  }

#include "stdafx.h"
#include <iostream>
#include <cmath>
using namespace std;
 
int _tmain(int argc, _TCHAR* argv[])
{
    int firstrub, firstcop, secondrub, secondcop;
    int sum_mult;
    double fmoney, smoney, sum_div;
    int rub = 0, cop = 0;
    double divrub,divcop;
    cin >> firstrub;
    cin >> firstcop;
    cin >> secondrub;
    cin >> secondcop;
    fmoney = firstrub*100 + firstcop;
    smoney = secondrub*100 + secondcop;
    sum_mult = fmoney * smoney;
    sum_div = fmoney / smoney;
    rub = (sum_mult/100-(sum_mult/100%100))/100;
    cop = sum_mult/100%100;
    divcop = modf(sum_div,&divrub);
    cout << "Multiplication = " << rub << "rub " << cop << "cop" << endl;
    cout << "Division = " << divrub << "rub " << (int)(divcop*100) << "cop" << endl;
    system("pause");
    return 0;
}