// DU03.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

char znak;
double a[2], b[2], c[2];
int temp1, temp2, temp3;

void soucet(double a[2], double b[2], double c[2])
{
	c[0] = a[0] + b[0];
	c[1] = a[1] + b[1];
}

void rozdil(double a[2], double b[2], double c[2])
{
	c[0] = a[0] - b[0];
	c[1] = a[1] - b[1];
}

void soucin(double a[2], double b[2], double c[2])
//soucin komplexnich cisel se vypocte realna slozka * realna slozka - imaginarni slozka * imaginarni slozka - dle vzorce (ac - bd) + i(ad + bc)
{
	c[0] = a[0] * b[0] - a[1] * b[1];
	c[1] = a[0] * b[1] + a[1] * b[0];
}

void podil(double a[2], double b[2], double c[2])
//pri podilu je treba vyloucit deleni nulou
{
	if (b[0] == 0 && b[1] == 0)
		printf("Deleni 0 + 0j nelze.");
	else
	{
		temp1 = a[0] * b[0] + a[1] * b[1];
		temp2 = a[1] * b[0] - a[0] * b[1];
		temp3 = b[0] * b[0] + b[1] * b[1];

		if (temp1%temp3 == 0 && temp2%temp3 == 0)
		{
			if (temp2 / temp3 >= 0)
				printf("Algebraicky tvar: %d + %dj", temp1 / temp3, temp2 / temp3);
			else
				printf("Algebraicky tvar: %d %dj", temp1 / temp3, temp2 / temp3);
		}
		else if (temp1%temp3 == 0 && temp2%temp3 != 0)
		{
			if (temp2 / temp3 >= 0)
				printf("Algebraicky tvar: %d + %d/%dj", temp1 / temp3, temp2, temp3);
			else
				printf("Algebraicky tvar: %d %d/%dj", temp1 / temp3, temp2, temp3);
		}
		else if (temp1%temp3 != 0 && temp2%temp3 == 0)
		{
			if (temp2 / temp3 >= 0)
				printf("Algebraicky tvar: %d/%d + %dj", temp1, temp3, temp2 / temp3);
			else
				printf("Algebraicky tvar: %d %d/%dj", temp1, temp3, temp2 / temp3);
		}
		else
		{
			if (temp2 / temp3 >= 0)
				printf("Algebraicky tvar: %d/%d + %d/%dj", temp1, temp3, temp2, temp3);
			else
				printf("Algebraicky tvar: %d/%d %d/%dj", temp1, temp3, temp2, temp3);
		}
	}
}

void tisk(double c[2])
{
	if (c[1] >= 0)
	{
		znak = '+';
	}
	else
	{
		znak = '-'; c[1] = c[1] * (-1);
	}
	printf("Algebraicky tvar: %.1lf %c %.1lfj \n", c[0], znak, c[1]);
}


int main()
{
printf("Zadej prvni realnou slozku:\n");
scanf_s("%lf", &a[0]);

printf("Zadej prvni imaginarni slozku:\n");
scanf_s("%lf", &a[1]);

printf("Zadej druhou realnou slozku:\n");
scanf_s("%lf", &b[0]);

printf("Zadej druhou imaginarni slozku:\n");
scanf_s("%lf", &b[1]);

printf("Zadej znamenko operace (+, -, *, /):\n");
scanf_s(" %c", &znak);
printf("\n");

switch(znak)
{
case '+':
	soucet(a, b, c);
	tisk(c);
	break;

case '-':
	rozdil(a, b, c);
	tisk(c);
	break;

case '*':
	soucin(a, b, c);
	tisk(c);
	break;

case '/':
	podil(a, b, c);
	break;

default:
	printf("Zadej pouze znamenko +, -, * nebo /");
	break;
}
	getchar();
	return 0;
}