#include "stdafx.h"
#include <iostream>
#include<cmath>

int main()
{
    float a, b, c, x1, x2, D;
    std::cout << "PROGRAMA ROZVJAZKY KVADRATNUX RIVNJAN" << "\n";
    std::cout << "a*x^2 + b*x + c = 0" << "\n";
    std::cout << "Vvedit koeficientu a , b, c" << "\n";
    std::cin >> a >> b >> c;
    if (a == 0 && b == 0 && c == 0)
    {
        std::cout << "rivnanja pogano obymovlene" << "\n";
        system("pause");
        exit;
    }
    else if (a ==0 && b!=0 && c==0)
    {
        float x=0;
        std::cout << "x=" << x << "\n";
        system("pause");
        exit;
    }
    else if (a != 0 && b != 0 && c == 0)
    {
        //ax^2 + bx = 0
        //x(ax-b) = 0
        //x=0 && x=b/a;
        x1 = 0;
        x2 = b / a;
        std::cout << "x1=" << x1 << "\n";
        std::cout << "x2=" << x2 << "\n";
        system("pause");
        exit;

    }
    else if (a == 0 && b != 0 && c != 0)
    {
        float x;
        //bx+c=0
        //x=-c/b
        x = -c / b;
        std::cout << "x= " << x << "\n";
        system("pause");
        exit;
    }
    else if (a == 0 && b == 0 && c != 0)
    {
        std::cout << "Rivnanja ne mae rozvjazkiv" << "\n";
        system("pause");
        exit;
    }
    else
    {
        D = b*b - 4 * a*c;
        if (D < 0) {
            std::cout << "rivnaja ne maje rozvjazkiv" << "\n";
            std::cout << "D=" << D << "\n";
            system("pause");
            exit;
        }
        else if (D == 0)
        {
            float x;
            x = (-b / (2 * a));
            std::cout << "D=" << D << "\n";
            std::cout << "x = " << x << "\n";
            system("pause");
        }
        else
        {
            x1 = (-b + sqrt(D)) / (2 * a);
            x2 = (-b - sqrt(D)) / (2 * a);
            std::cout << "D=" << D << "\n";
            std::cout << "x1=" << x1 << "\n" << "x2=" << x2 << "\n";
            system("pause");
        }
    }
}