// mycalc.cpp

// 3. application file

#include <iostream>
#include <cstdlib>

using namespace std;

#include "calculator.h"

int main(int argc, char *argv[])
{
	if(argc == 4)
	{
		try
		{
			float a = atof(argv[1]);
			float b = atof(argv[3]);

			Calculator MyCalculator;

			switch(argv[2][0])
			{
				case '+': MyCalculator.add(a, b); break;
				case '-': MyCalculator.subtract(a, b); break;
				case '*': MyCalculator.multiply(a, b); break;
				case '/': MyCalculator.divide(a, b); break;
				default: throw(0);
			}
			cout << "Answer: " << MyCalculator.getResult() << endl;
		}
		catch(...)  // trap any exception
		{
			cout << "Exception thrown! Use only numbers and the operators +, -, *, or /" << endl;
		}
	}
	else
	{
		cout << "Usage  : mycalc.exe num1 +|-|*|/ num2" << endl;
		cout << "Example: mycalc.exe 2 + 2 (returns 4)" << endl;
	}

	return 0;
}