//Josh Curl
//11-1-10
//PG1_16_1

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

int main()
{
	double memory, n, total;
	bool total_set = false, memory_set = false;
	char o;
	do
	{
		if(!total_set)
		{
			cout << "Type in the first number" << endl;
			cin >> total;
			total_set = true;
		}
		cout << "Math Operator Options" << endl << "[+]Add [-]Subtract [*]Multiply [/]Divide" << endl << "[s]Square [r]Square Root [p]Power [a]Absolute value" << endl << "[m]Memory options [q]Quit" << endl;
		cin >> o;
		o = tolower(o);
		switch(o)
		{
			case '+':
				cout << "Enter next number: ";
				cin >> n;
				total += n;
				break;
			case '-':
				cout << "Enter next number: ";
				cin >> n;
				total -= n;
				break;
			case '*':
				cout << "Enter next number: ";
				cin >> n;
				total *= n;
				break;
			case '/':
				cout << "Enter next number: ";
				cin >> n;
				while(n == 0)
				{
					cout << "Error: Enter a number thats not zero" << endl;
					cin >> n;
				}
				total /= n;
				break;
			case 's':
				total *= total;
				break;
			case 'r':
				total = sqrt(total);
				break;
			case 'p':
				cout << "Enter next number: ";
				cin >> n;
				total = pow(total, n);
				break;
			case 'a':
				total = abs(total);
				break;
			case 'c':
				total_set = false;
				break;
			case 'm':
				cout << "Memory options:" << endl << "[s]Set [p]Print [c]Clear [+]Add [-]Subtract" << endl;
				cin >> o;
				switch(o)
				{
					case 's':
						cout << "Enter new value for memory: ";
						cin >> n;
						memory = n;
						memory_set = true;
						break;
					case 'p':
						if(memory_set)
						{
							cout << memory << endl;
						}
						else
						{
							cout << "Error: Memory not set" << endl;
						}
						break;
					case 'c':
						memory_set = false;
						break;
					case '+':
						if(memory_set)
						{
							cout << "Enter next number: ";
							cin >> n;
							memory += n;
						}
						else
						{
							cout << "Error: Memory not set" << endl;
						}
						break;
					case '-':
						if(memory_set)
						{
							cout << "Enter next number: ";
							cin >> n;
							memory -= n;
						}
						else
						{
							cout << "Error: Memory not set" << endl;
						}
						break;
				}
				break;

		}
		cout << "Total: ";
		if(total_set)
		{
			cout << total << endl;
		}
		else
		{
			cout << "<cleared>" << endl;
		}
	}
	while(o != 'q');
	return 0;
}