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

int main()
{
	float a, b, c, d;
	float root1, root2;

	printf("Enter the coefficients of a quadratic equation:\n");
	printf("ax^2 + bx + c = 0 --> ");
	scanf("%f %f %f", &a, &b, &c);

	d = b * b - 4 * a * c;

	if (a == 0)
	{
		if (b == 0)
			printf("It is not an equation\n");
		else
		{
			root1 = -c / b;
			printf("Root of the linear equation = %.2f\n", root1);
		}
	}
	else
	{
		if (d < 0)
			printf("No real root.\n");
		else if (d == 0)
		{
			root1 = -b / (2 * a);
			printf("The double root = %.2f\n", root1);
		}
		else
		{
			root1 = (-b + sqrt(d)) / (2 * a);
			root2 = (-b - sqrt(d)) / (2 * a);
			printf("The unequal roots are %.2f and %.2f\n", root1, root2);
		}
	}

	return 0;
}