// calculator.cpp

// 2. implementation file

#include "calculator.h"

		
//public:

Calculator::Calculator() // constructor
{
	m_result = 0.0;
	m_memory = 0.0;
}

Calculator::~Calculator() // destructor
{
	// no pointers in class - nothing to do!
}

void Calculator::add(float a, float b)
{
	m_result = a + b;
	memAdd(m_result);
}

void Calculator::subtract(float a, float b)
{
	m_result = a - b;
	memAdd(m_result);
}

void Calculator::multiply(float a, float b)
{
	m_result = a * b;
	memAdd(m_result);
}

void Calculator::divide(float a, float b)
{
	if(b != 0.0)
	{
		m_result = a / b;
		memAdd(m_result);
	}
}

float Calculator::getResult() // accessor
{
	return m_result;
}

void Calculator::clearResult() // mutator
{
	m_result = 0.0;
}

float Calculator::getMemory() // accessor
{
	return m_memory;
}

void Calculator::clearMemory() // mutator
{
	m_memory = 0.0;
}

// protected:

void Calculator::memAdd(float r)
{
	m_memory = m_memory + r;
}