#include <iostream>
#include <iomanip>
using namespace std;

double getDollarAmt();
void displayCurrencies();
char getCurrencySelection();
bool isSelectionValid(char choice);
double calcExchangeAmt(double dollars, char choice);
void displayResults(double dollars, double exchangedAmt, char choice);
int main()
{
    double dollars;
    char choice;
    double exchangedAmt;

    dollars = getDollarAmt();

    displayCurrencies();

    choice = getCurrencySelection();

    exchangedAmt = calcExchangeAmt(dollars, choice);

    displayResults(dollars, exchangedAmt, choice);

    system("pause");
    return 0;
}
double getDollarAmt()
{
    double dollars;

    cout << "Enter the total dollar amount you would like to exchange: \n$";
    cin >> dollars;

    return dollars;
}
void displayCurrencies()
{
    cout << "Please select a target currency:\n\n"
        << "A.\t Russian Ruble\n"
        << "B.\t North Korean Won\n"
        << "C.\t Chinese Yuan\n"
        << "D.\t Cuban Peso\n"
        << "E.\t Ethiopian Birr\n"
        << "F.\t Thai Baht\n"
        << "G.\t Canadian Dollars\n"
        << "H.\t Tunisian Dollars\n"
        << "I.\t Egyptian Pound\n";
}
char getCurrencySelection()
{
    bool validChoice = true;
    char choice;

    cout << "\nPlease enter your selection:  ";
    cin >> choice;

//  isSelectionValid(choice);

    return validChoice = isSelectionValid(choice);

}
bool isSelectionValid(char choice)
{
    if (choice >= 'A' && choice <= 'I' || choice >= 'a' && choice <= 'z')
    {
        return true;
    }
    else
    {
        cout << "Invalid input.\n";
        return false;
    }
}
double calcExchangeAmt(double dollars, char choice)
{
    double exchangedAmt;
    const double russianRuble = 31.168;
    const double koreanWon = 135.0;
    const double chineseYuan = 6.832;
    const double canadianDollar = 1.1137;
    const double cubanPeso = 1.0;
    const double ethiopianBirr = 9.09;
    const double egyptianPound = 5.6275;
    const double tunisianDinar = 1.3585;
    const double thaiBaht = 34.4;

    switch (toupper(choice))
    {
    case 'A': exchangedAmt = dollars * russianRuble;
        break;
    case 'B': exchangedAmt = dollars * koreanWon;
        break;
    case 'C': exchangedAmt = dollars * chineseYuan;
        break;
    case 'D': exchangedAmt = dollars * canadianDollar;
        break;
    case 'E': exchangedAmt = dollars * cubanPeso;
        break;
    case 'F': exchangedAmt = dollars * ethiopianBirr;
        break;
    case 'G': exchangedAmt = dollars * egyptianPound;
        break;
    case 'H': exchangedAmt = dollars * tunisianDinar;
        break;
    case 'I': exchangedAmt = dollars * thaiBaht;
        break;
    }
    return exchangedAmt;
}
void displayResults(double dollars, double exchangedAmt, char choice)
{
    cout << "$" << dollars << " is " << exchangedAmt;

        switch (toupper(choice))
        {
        case 'A': cout << " Russian Rubles.\n";
            break;
        case 'B': cout << " North Korean Won.\n";
            break;
        case 'C': cout << " Chinese Yuan.\n";
            break;
        case 'D': cout << " Canadian Dollar.\n";
            break;
        case 'E': cout << " Cuban Peso.\n";
            break;
        case 'F': cout << " Ethiopian Birr.\n";
            break;
        case 'G': cout << " Egyptian Pound.\n";
            break;
        case 'H': cout << " Tunisian Dinar.\n";
            break;
        case 'I': cout << " Thai Baht.\n";
            break;
        }
}