3.13 Streaming Input Parsing, Operator Precedence & Embedded Command-Line Interfaces (CLI)

#include <iostream>
using namespace std;

int main() {
	char package;
	int numDevices;
	int totalCost = 0;

	int devicesOver = 0;
	const int includedA = 1;
	const int includedB = 3;
	const int includedC = 5;

	const int baseA = 9;
	const int baseB = 14;
	const int baseC = 20;

	const int extraA = 6;
	const int extraB = 4;
	const int extraC = 2;

	cout << "Welcome to the Streaming Subscription Calculator!" << endl;
	cout << "Enter your package (A, B, or C): ";
	cin >> package;

	cout << "Enter number of simultaneous devices user: ";
	cin >> numDevices;

	if (package == 'A') {
		totalCost += baseA;
		if (numDevices > includedA) {
			devicesOver = numDevices - includedA;
			totalCost += devicesOver * extraA;
		}
	}
	else if (package == 'B') {
		totalCost += baseB;
		if (numDevices > includedB) {
			devicesOver = numDevices - includedB;
			totalCost += devicesOver * extraB;
		}
	}
	else if (package == 'C') {
		totalCost += baseC;
		if (numDevices > includedC) {
			devicesOver = numDevices - includedC;
			totalCost += devicesOver * extraC;
		}
	}
	else {
		cout << "Invalid package selection." << endl;
		return 0;
	}

	cout << "Your total cost for the month is: $" << totalCost << endl;

	return 0;
}