Help with a program

My teacher is asking me "Prompt the user if they'd like to do another cost of commute calculation. If they enter 'Y' or 'y', then repeat; otherwise, print the following and exit the program. "

Code:

#include <iostream>
using namespace std;

int main(int, char**) {
    int milesPerDay;
    int daysPerWeek;
    int weeksPerYear;
    int milesPerGallon;
    double pricePerGallon;
    
        
    cout << "How many miles round-trip a day do you commute?";
    cin >> milesPerDay;
    cout << "How many days a week do you commute?";
    cin >> daysPerWeek;
    cout << "How many weeks a year do you commute?";
    cin >> weeksPerYear;
    cout << "How many miles per gallon does your vehicle get?";
    cin >> milesPerGallon;
    cout << "What is the current per gallon price of gas?";
    cin  >> pricePerGallon;
    
    int milesPerYear = milesPerDay * daysPerWeek * weeksPerYear;
    int gallonsPerYear = milesPerYear / milesPerGallon;
    double gasMoneyPerYear = gallonsPerYear * pricePerGallon;
    double monthlyGasExpense = gasMoneyPerYear / 12;
    cout << milesPerDay << " " << "miles a day" << endl;
    cout << daysPerWeek << " " << "days a week" << endl;
    cout << weeksPerYear << " " << "weeks a year" << endl;
    cout << milesPerGallon << " " << "miles per gallon" << endl;
    cout << "$" << pricePerGallon << " " << "per gallon" << endl;
    cout << "monthly gas expense:" << "  " << monthlyGasExpense << endl;
    system("pause");
    
    char loop = 'Y' || 'y';
    cout << "Would you like to do another cost of commute calculation?"
         << "Enter y for yes enter n for no" << endl;
    cin >> loop;
    if (loop = 'Y' || 'y') {
        
    
}

What do I do in order to get the program to loop?

Code:

#include <iostream>
using namespace std;

int main(int, char**) {
    int milesPerDay;
    int daysPerWeek;
    int weeksPerYear;
    int milesPerGallon;
    double pricePerGallon;
    char loop = 'Y' ;
    
    do{
    
    cout << "How many miles round-trip a day do you commute?";
    cin >> milesPerDay;
    cout << "How many days a week do you commute?";
    cin >> daysPerWeek;
    cout << "How many weeks a year do you commute?";
    cin >> weeksPerYear;
    cout << "How many miles per gallon does your vehicle get?";
    cin >> milesPerGallon;
    cout << "What is the current per gallon price of gas?";
    cin  >> pricePerGallon;
    
    int milesPerYear = milesPerDay * daysPerWeek * weeksPerYear;
    int gallonsPerYear = milesPerYear / milesPerGallon;
    double gasMoneyPerYear = gallonsPerYear * pricePerGallon;
    double monthlyGasExpense = gasMoneyPerYear / 12;
    cout << milesPerDay << " " << "miles a day" << endl;
    cout << daysPerWeek << " " << "days a week" << endl;
    cout << weeksPerYear << " " << "weeks a year" << endl;
    cout << milesPerGallon << " " << "miles per gallon" << endl;
    cout << "$" << pricePerGallon << " " << "per gallon" << endl;
    cout << "monthly gas expense:" << "  " << monthlyGasExpense << endl;
    system("pause");
    
    cout << "Would you like to do another cost of commute calculation?"
         << "Enter y for yes enter n for no" << endl;
    cin >> loop;
    }while (loop=='Y' || loop=='y');
        
    
}

Thanks, I thought it might be that but it seemed wrong wasn't thinking ><