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

main()
{
	float a, b, c, D, A, B;
	printf("Input a binominal equation (ax^2+bx+c=0)\na=");
	scanf("%f", &a);
	printf("b=");
	scanf("%f", &b);
	printf("c=");
	scanf("%f", &c);
	
	D=b*b-4*a*c;
	if(a==0) 
		if(b==0) printf("No solution.\n");
		else printf("One root: %f\n", -c/b);
	else 
		if(D<0) printf("No real solution.\n");
		else { 
				A=-b/2/a;
			if(D) {
				B=sqrt(D)/2/a;
				printf("Two real roots: %f and %f.\n", A+B, A-B);
			}
			else
				printf("One real root: %f.\n", A);
		}
}