stacker.cpp

// stacker.cpp -- testing the Stack class
#include <iostream>
#include <ctype.h>
#include "stack.h"

int main()
{
	using namespace std;
	Stack st;
	char ch;
	unsigned long po;
	cout << "Please enter A to add a purchase order. \n"
		<< "P to process a PO, or Q to quit.\n";
	while (cin >> ch && toupper(ch) != 'Q') {
		while (cin.get() != '\n') {
			continue;
		}
		if (!isalpha(ch)) {
			cout << '\a';
			continue;
		}
		switch(ch) {
			case 'A':
			case 'a': cout << "Enter a PO number to add: ";
					cin >> po;
					if (st.isfull()) {
						cout << "stock already full\n";
					} else {
						st.push(po);
					}
					break;
			case 'P':
			case 'p': 
					if (st.isempty()) {
						cout << "stack already empty\n";
					} else {
						st.pop(po);
						cout << "PO #" << po << " popped\n";
					}
					break;
		}
		cout << "Please enter A to add a purchase order.\n"
			<< "P to process a PO, or Q to quit.\n";
	}
	cout << "Bye\n";
	return 0;

}