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

int main()
{
	float a, b, c, d;
	float root1, root2;
	int x;
	
	x = 1;

	while ( x== 1)
	{

 		printf("Solving quadratic equation: ax^2+bx+c=0\na = ");
		scanf("%f" , &a);
		
		while (a == 0)
		{
			printf("a can't be equal to 0\na = ");
			scanf("%f", &a);
		}
		printf("b = ");
		scanf("%f", &b);
		printf("c = ");
		scanf("%f", &c);

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

		if ( d < 0 )
			printf("No real root\n\n");
		else if ( d == 0 )
		{
			root1 = -b / (2 * a);
			printf("There is an equal root.\n");
			printf("It is %1.0f.\n\n",root1);
		}
		else
		{
			root1 = (-b + sqrt(d)) / (2 * a);
			root2 = (-b - sqrt(d)) / (2 * a);
			printf("There are two real roots.\n");
			printf("They are %1.0f",root1);
			printf(" and %1.0f.\n\n",root2);
		}	 
		printf("Continue(yes=1/no=0)?");
		scanf("%i",&x);
		printf("\n");
	}
	
	return 0;
}