parkingGarageCharge

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <ctype.h>
#include <math.h>

//constants
const double MIN_HOURS_AT_FLAT_RATE = 3.0;
const double MIN_FLAT_RATE_CHARGE = 3.00;
const double ADDITIONAL_HOURS_RATE = 0.75;
const double MAX_HOURS_ALLOWED = 24.0;
const double MAX_CHARGE = 12.00;

double validateHours(double parkedHours); // function prototype
double calculatePartingFee(int numCar, double parkedHours); // function prototype
void displayParkingCharge(double parkedHours, double carCharge, int numCar); // function prototype
void parkingSummary(int totalCars, double totalCharge, double totalHours); // function prototype

int main(void)
{
	double hours = 0;
	double totalCharges = 0;
	double totalHours = 0;
	int totalCars = 0;
	double charge = 0;
	unsigned int carNumber = 0;
	bool parkingMode = true;
	

	//loop will run until sentinal value proves parkingMode false
	while (parkingMode != false) {
		
		//call validateHours function to get valid data
		hours = validateHours(hours);

		if (hours == -1) {
			parkingMode = false;
		}
		else {
			//increments car number and calls calculatePartingFee and displayParkingCharge
			carNumber++;
			charge = calculatePartingFee(carNumber, hours);
			displayParkingCharge(hours, charge, carNumber);

			//sums for parking summarry
			totalCharges += charge;
			totalHours += hours;
			totalCars = carNumber;

			parkingMode = true;
		}
		
	}

	//finished sales and calls parkingSummary to print summary
	parkingSummary(totalCars, totalCharges, totalHours);


}

double validateHours(double parkedHours) {
	bool validInput = false;
	
	do {
		puts("Enter the number of hours the car was parked or enter -1 to quit.");
		double scannedVar = scanf("%lf", &parkedHours);

		//check if scanf read something
		while ((getchar()) != '\n');
			//check for valid input
			//if value is number
			if (scannedVar == 1) {
					//if value is in range
					if (parkedHours == -1 || (parkedHours > 0 && parkedHours <= MAX_HOURS_ALLOWED)) {
						validInput = true;
					}
					else {
						validInput = false;
						puts("hours must be greater than 0 and less than or equal to 24.");
					}
			}
			else {
				validInput = false;
				puts("You did not enter a number");
			}

		
	} while (validInput != true);
	return parkedHours;
}

double calculatePartingFee(int numCar, double parkedHours) {
	double parkingCharge = 0;

	if (parkedHours > 0 && parkedHours <= MIN_HOURS_AT_FLAT_RATE) {
		parkingCharge = MIN_FLAT_RATE_CHARGE;
	}
	else if (parkedHours < MAX_HOURS_ALLOWED && parkedHours > MIN_HOURS_AT_FLAT_RATE) {
		parkedHours = ceil(parkedHours) - MIN_HOURS_AT_FLAT_RATE;
		parkingCharge = MIN_FLAT_RATE_CHARGE + (parkedHours * ADDITIONAL_HOURS_RATE);
		
		//check if charge exceeds max charge
		if (parkingCharge > MAX_CHARGE) {
			parkingCharge = MAX_CHARGE;
		}
		else {
			parkingCharge = parkingCharge;
		}
	}
	else {
		parkingCharge = MAX_CHARGE;
	}

	return parkingCharge;
}

void displayParkingCharge(double parkedHours, double carCharge, int numCar) {
	puts("Car          Hours         Charge");
	printf(" %d           %.1lf	     $%.2lf\n", numCar, parkedHours, carCharge);
}

void parkingSummary(int totalOfCars, double totalOfCharge, double totalOfHours) {
	if (totalOfCars != 0) {
		puts("Parking Garage Summary\n");
		puts("Total Cars          Total Hours         Total Charge");
		printf(" %d                   %.1lf	              $%.2lf\n", totalOfCars, totalOfHours, totalOfCharge);
	}
	else {
		puts("Parking Garage Summary \nThere were no cars parked today.\n");
	}
}