// nested if statements

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

int main()
{
	int menuChoice = 0;
	int numBooks = 0;

	cout << "1 Books" << endl;
	cout << "2 Movies" << endl;
	cout << "3 Peanuts" << endl;
	cout << "4 Checkout" << endl;
	cout << "Enter your choice: ";
	cin >> menuChoice; 

	if (menuChoice == 1)
	{
		cout << "Enter number of books (50 or less): ";
		cin >> numBooks;

		if (numBooks > 50 || numBooks < 0)
		{
			cout << "Invalid input." << endl;
		}
		else
		{
			// user inputs quantity of books here
			// do mathematical calculations here
		}

	}

	system("pause");

	return 0;
}// end of main