PA - Phone Bill

// Christian Ballard
// COSC 1336 - 001
// February 18th, 2015
// This program should take the users information and display the customers name,
// account number, service type, and the amount that is due.

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

// Prototypes
int readInt(string errorMsg = "", int min = INT_MIN, int max = INT_MAX);
void getData(string&, int&, char&, int&);
char getChoice(string prompt, char char1, char char2);
double processData(char service);
void display(string, int, char, double);


// Regular service
const double RCHARGE = 10.00;            // Minimum charge for regular service.
const double RPERMIN = 0.20;             // The charge per minutes after 50.
const int REG_MINS = 50;                         // The number of free minutes allowed for regular service.
// Premium service
const double PCHARGE = 25.00;            // Minimum charge for premium service.
const double P_PER_MIN_DAY = 0.10;       // Charge per day minutes after 75.
const double P_PER_MIN_NIGHT = 0.05; // Charge per night minutes after 100.
const int P_DAY = 75;                            // Number of free minutes allowed during the day.
const int P_NIGHT = 100;                         // Number of free minutes allowed during the night.

int main()
{
    string name;            // Stores the users name.
    int accountNumber;  // Stores the users account number.
    char serviceType;   // Stores the users service type.
    int minutes;            // Stores the users minutes.
    bool loopies = true;// Controls the loop while condition is true.


    while (loopies == true)
    {
        getData(name, accountNumber, serviceType, minutes);
    }


    return 0;
}
// Checks ints to make sure they are valid.
int readInt(string errorMsg, int min, int max)
{
    int someInt;            // Stores each integer entered
    bool valid = false; // Loop control flag indicating validity of entry
    // initially assuming not valid.
    do
    {
        // Read an integer delimited by a whitespace character
        cin >> someInt;

        // Valid if within min to max range.
        valid = someInt >= min && someInt <= max;

        // Detect and remove invalid input
        if (cin.fail() || !valid || !isspace(cin.peek()))
        {
            cout << "\nError! Invalid input.\n" << errorMsg << " must be a whole "
                << "number between " << min << " and " << max << ". \nTry Again: ";

            cin.clear();            // Clears the fail state.

            // Remove up to max number of chars in input stream or up to '\n'.
            cin.ignore(numeric_limits<streamsize>::max(), '\n');

            valid = false;          // No valid entry has been read.
        }

    } while (!valid); // Loop again, prompting user to re-enter a valid integer.

    // When valid input received, remove from input stream up to 100 remaining
    // characters or until reaches the '\n' <ENTER> character.
    cin.ignore(100, '\n');

    return someInt; // Returns a valid integer to calling environment.
}
// Takes all user data and checks input.
void getData(string &name, int &account, char &service, int &bill)
{
    cout << "Enter customer name or \"Exit\" to end program: ";
    getline(cin, name);

    if (name == "Exit" || name == "EXIT" || name == "exit")
    {
        cout << "Program closing..." << endl;
        system("pause");
        exit(EXIT_SUCCESS);
    }

    cout << "Enter account number: ";
    account = readInt("Account", 0, 10000);

    cout << "Enter service type (R for regular or P for premium): ";
    service = getChoice("Service", 'r', 'p' );

    cout << fixed << setprecision(2);

    bill = processData(service);

    display(name, account, service, bill);


}

char getChoice(string input, char char1, char char2)
{
    char character;     // Stores the users character.
    bool valid = false; // Controls the loop.

    do
    {

        cout << input << " (" << char1 << " or " << char2 << "): ";
        cin >> character;
        character = tolower(character);


        valid = (character == char1 || character == char2);


        if (!valid || !isspace(cin.peek())) {
            cout << "Invalid input!" << endl;
            cout << input << " needs to be " << char1 << " or " << char2 << endl;
            cout << "Re-enter ";
            cin.clear();
            cin.ignore(numeric_limits<streamsize>::max(), '\n');

            valid = false;
        }
    } while (!valid);

    cin.ignore(100, '\n');

    return character;
}

double processData(char service)
{
    int dayMin;              // Stores the users day minutes.
    int nightMin;    // Stores the users night minutes.
    double totalPay; // Stores the total pay.
    double dayPay;   // Stores the pay for day minutes.
    double nightPay; // Stores the pay for night minutes.

    if (service == 'r')
    {
        cout << "Enter minutes used: ";
        cin >> dayMin;

        if (dayMin > REG_MINS)
        {
            dayMin -= REG_MINS;
            dayMin = (dayMin * RPERMIN) + RCHARGE;
            totalPay = dayMin;
        }
        else
        {
            totalPay = RCHARGE;
        }
    }
    else
    {
        cout << "Enter day minutes: ";
        cin >> dayMin;
        if (dayMin > P_DAY)
        {
            dayMin -= P_DAY;
            dayMin = (dayMin * P_PER_MIN_DAY) + PCHARGE;
            dayPay = dayMin;
        }
        else
        {
            dayPay = PCHARGE;
        }

        cout << "Enter night minutes: ";
        cin >> nightMin;
        if (nightMin > P_NIGHT)
        {
            nightMin -= P_NIGHT;
            nightMin = (nightMin * P_PER_MIN_NIGHT) + PCHARGE;
            nightPay = nightMin;
        }
        else
        {
            nightPay = PCHARGE;
        }
        totalPay = nightPay + dayPay - PCHARGE;
    }


    return totalPay;
}

void display(string name, int account, char service, double bill)
{
    if(service == 'r')
    {
        cout << endl;
        cout << "Customer Name: " << name << endl;
        cout << "Account number: " << account << endl;
        cout << "Service type: " << "Regular" << endl;
        cout << "Amount due: $" << bill << endl;
    }
    else if (service == 'p')
    {
        cout << endl;
        cout << "Customer Name: " << name << endl;
        cout << "Account number: " << account << endl;
        cout << "Service type: " << "Premium" << endl;
        cout << "Amount due: $" << bill << endl;
    }

}