#include "stdafx.h"
#include <iostream>
#include <string>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <sstream>
using namespace std;

#pragma region operations
void add(int &firstValueRe, int &secondValueRe, int firstValueIm, int secondValueIm)
{
	int sumRe = 0;
	int sumIm = 0;
	char plusOrMinus= '+';
	char charI = 'i';
	if (firstValueIm == 0)
	{
		firstValueIm = 1;
	}
	if (secondValueIm == 0)
	{
		secondValueIm = 1;
	}
	sumRe = firstValueRe + secondValueRe;
	sumIm = firstValueIm + secondValueIm;

	if (sumIm < 0)
	{
		char plusOrMinus = '-';
		sumIm *= -1;
		char charI = 'i';
		cout << "Answer: " << sumRe << plusOrMinus << sumIm << charI << endl;
	}
	else if (sumIm > 0)
	{
		char plusOrMinus = '+';
		char charI = 'i';
		cout << "Answer: " << sumRe << plusOrMinus << sumIm << charI << endl;
	}
	else if (sumIm == 1)
	{
		cout << "Answer: " << sumRe << plusOrMinus << charI << endl;
	}
	else if (sumIm == 0 && sumRe != 0)
	{
		cout << "Answer: " << sumRe << endl;
	}
	else if (sumRe == 0 && sumIm != 0)
	{
		cout << "Answer: " << sumIm << charI << endl;
	}
	else if (sumRe == 0 && sumIm == 0)
	{
		cout << "Answer: 0" << endl;
	}


}
void sub(int &firstValueRe, int &secondValueRe, int &firstValueIm, int &secondValueIm)
{
	int difRe;
	int difIm;
	char plusOrMinus = '+';
	char charI= 'i';
	difRe = firstValueRe - secondValueRe;
	difIm = firstValueIm - secondValueIm;
	if (difIm < 0)
	{
		char plusOrMinus = '-';
		difIm *= -1;
		char charI = 'i';
	}
	else if (difIm > 0)
	{
		char plusOrMinus = '+';
		char charI = 'i';
	}
	else if (difIm == 1)
	{
		cout << "Answer: " << difRe << plusOrMinus << charI << endl;
	}
	else if (difIm == -1)
	{
		difIm *= -1;
		cout << "Answer: " << difRe << plusOrMinus << charI << endl;
	}
	else if (difIm == 0 && difRe != 0)
	{
		cout << "Answer: " << difRe << endl;
	}
	else if (difRe == 0 && difIm != 0)
	{
		cout << "Answer: " << difIm << charI << endl;
	}
	else if (difRe == 0 && difIm == 0)
	{
		cout << "Answer: 0" << endl;
	}
	cout << "Answer: " << difRe << plusOrMinus << difIm << charI << endl;
}
void mul(int &firstValueRe, int &secondValueRe, int &firstValueIm, int &secondValueIm)
{
	int proRe;
	int proIm;
	char plusOrMinus = '+';
	char charI = 'i';
	proRe = (firstValueRe*secondValueRe) - (firstValueIm*secondValueIm);
	proIm = (firstValueRe*secondValueIm) + (firstValueIm*secondValueRe);
	if (proIm < 0)
	{
		char plusOrMinus = '-';
		proIm *= -1;
		char charI = 'i';
	}
	else if (proIm > 0)
	{
		char plusOrMinus = '+';
		char charI = 'i';
	}
	else if (proIm == 1)
	{
		cout << "Answer: " << proRe << plusOrMinus << charI << endl;
	}
	else if (proIm == 0 && proRe != 0)
	{
		cout << "Answer: " << proRe << endl;
	}
	else if (proRe == 0 && proIm != 0)
	{
		cout << "Answer: " << proIm << charI << endl;
	}
	else if (proRe == 0 && proIm == 0)
	{
		cout << "Answer: 0" << endl;
	}
	cout << "Answer: " << proRe << plusOrMinus << proIm << charI << endl;
}
void div(int &firstValueRe, int &secondValueRe, int &firstValueIm, int &secondValueIm)
{
	double quoRe;
	double quoIm;
	char plusOrMinus = '+';
	char charI= 'i';
	quoRe = ((firstValueRe*secondValueRe) + (firstValueIm*secondValueIm)) / (pow(secondValueRe, 2) + pow(secondValueIm, 2));
	quoIm = ((firstValueIm*secondValueRe) - (firstValueRe*secondValueIm)) / (pow(secondValueRe, 2) + pow(secondValueIm, 2));
	if (quoIm < 0)
	{
		char plusOrMinus = '-';
		quoIm *= -1;
		char charI = 'i';
	}
	else if (quoIm > 0)
	{
		char plusOrMinus = '+';
		char charI = 'i';
	}
	else if (quoIm == 1)
	{
		cout << "Answer: " << quoRe << plusOrMinus << charI << endl;
	}
	else if (quoIm == 0 && quoRe != 0)
	{
		cout << "Answer: " << quoRe << endl;
	}
	else if (quoRe == 0 && quoIm != 0)
	{
		cout << "Answer: " << quoIm << charI << endl;
	}
	else if (quoRe == 0 && quoIm == 0)
	{
		cout << "Answer: 0" << endl;
	}
	cout << "Answer: " << quoRe << plusOrMinus << quoIm << charI << endl;
}
#pragma endregion

int main()
{
	bool tr;
	tr = true;
	while (tr == true)
	{
		string firstValue;
		int firstValueRe;
		string firstValueImInput;
		int firstValueIm = 0;
		string secondValue;
		int secondValueRe;
		string secondValueImInput;
		int secondValueIm = 0;
		char inputOperation;
		double finalValue;
		stringstream ss;
		stringstream sn;



		cout << "Please choose one of the following operations:" << endl;
		cout << "======[Operations]======" << endl;
		cout << "=|+|=============|plus|=" << endl;
		cout << "=|-|============|minus|=" << endl;
		cout << "=|*|=========|multiply|=" << endl;
		cout << "=|/|===========|divide|=" << endl;
		cout << "======[Operations]======" << endl;
		cout << endl;
		cout << "... or press 'x' to exit.   ";
		cin >> inputOperation;

		if (inputOperation == 'x')
		{
			tr = false;
		}
		else
		{
			cout << "Enter first complex value (a+bi): ";
			cin >> firstValueRe;
			cin >> firstValueImInput;

					ss << firstValueImInput;
					ss >> firstValueIm;

			cout << "Enter second value's real part (c+di): ";
			cin >> secondValueRe;
			cin >> secondValueImInput;

					sn << secondValueImInput;
					sn >> secondValueIm;

			if (inputOperation == '+')
			{
				add(firstValueRe, secondValueRe, firstValueIm, secondValueIm);
				cout << endl;
			}
			else if (inputOperation == '-')
			{
				sub(firstValueRe, secondValueRe, firstValueIm, secondValueIm);
				cout << endl;
			}
			else if (inputOperation == '*')
			{
				mul(firstValueRe, secondValueRe, firstValueIm, secondValueIm);
				cout << endl;
			}
			else if (inputOperation == '/')
			{
				(double)firstValueIm;
				(double)secondValueIm;
				if (secondValueRe == 0 && secondValueIm == 0)
				{
					cout << "{begin: Error Message} \\ This input equation is not registered == Please enter other input equation for successful calculation \\ {end: Error Message}" << endl;
				}
				else
				{
					div(firstValueRe, secondValueRe, firstValueIm, secondValueIm);
					cout << endl;
				}

			}

		}

	}

}