#include <stdio.h>
#include <conio.h>
#include <math.h>

int main()
{
	printf("Calculator for Quadratic Equations.Please enter values for a, b and c. \n");

	float a, b, c;
	float x1, x2, d;
	
	printf("Enter a = ");
	scanf("%g", &a);

	printf("Enter b = ");
	scanf("%g", &b);

	printf("Enter c = ");
	scanf("%g", &c);

	if (a == 0)
	{
		x1 = - c / b;
		printf("x1 = %g\n", x1);
	}
	else if (b == 0)
	{
		if (-c / a < 0)
		{
			printf("Nqma reshenie\n");
		}
		else
		{
			x1 = sqrt(-c / a);
			x2 = -1 * sqrt(-c / a);

			printf("x1 = %g\n", x1);
			printf("x2 = %g\n", x2);
		}
		
	}
	else if (c == 0)
	{
		x1 = 0;
		x2 = -b / a;

		printf("x1 = %g\n", x1);
		printf("x2 = %g\n", x2);

	}
	else 
	{
		d = b*b - 4 * a*c;
		if (d < 0)
		{
			printf("Nqma realni koreni\n");
		}
		else if (d == 0)
		{
			x1 = (-b) / (2 * a);
			printf("x1 = x2 = %g\n", x1);
		}
		else 
		{
			x1 = (-b + sqrt(d)) / (2 * a);
			x2 = (-b - sqrt(d)) / (2 * a);

			printf("x1 = %g\n", x1);
			printf("x2 = %g\n", x2);
		}	
	}

	system("PAUSE");
	return 0;
}