Question about Cash Register change in change?

So, the point of this assignment is to get the change for the customer in the exact quarters, dimes, nickels, and pennies. I have already calculated how to get the total change and everything. I feel like I have done how to get that exact change. I think think the only problem right now is changing the double to int for how many dollars, quarters, dimes, etc. that is needed (because you can't split coins, etc.) I know that static_cast<int> should be used, but I'm not quite sure how to use it. Here's what I have:

#include <iostream>
using namespace std;

int main()
{
    double purchase_amount;
    double receive_amount;
    double total_change;
    double dollars;
    double quarters;
    double dimes;
    double nickels;
    double pennies;
    
    cout << "Enter purchase amount: ";
    cin >> purchase_amount;
    
    cout << "Enter amount received: ";
    cin >> receive_amount;
    
    total_change = receive_amount - purchase_amount;
    cout << "Total change: " << total_change; 
    
    dollars = total_change % 1;
    cout << "Dollars: " << endl;
    total_change = total_change - dollars * 1;
    
    
    quarters = total_change % .25;
    cout << "Quarters: " << endl;
    total_change = total_change - quarters * .25;
    
    dimes = total_change % .10;
    cout << "Dimes: " << endl;
    total_change = total_change - dimes * .10;
    
    nickels = total_change % .05;
    cout << "Nickels: " << endl;
    total_change = total_change - nickels * .05;
    
    pennies = total_change % .01;
    cout << "Pennies: " << endl;
    
    return 0;
}