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#!/usr/bin/python3

# -*- coding: utf8 -*-

print ("Welcome to 'Quadratic' solving program.")

a = int(input("Please, input the first coefficient:   "))

while a == 0:
    a = int(input("Be careful! That, is not a quadratic equation. Please, input a non-zero coefficient:   "))

b = int(input("Now, input the second coefficient:   "))

c = int(input("Now, input the constant:   "))

from math import sqrt

D = b**2 + (-4)*a*c

if D > 0:
    print ("The value of the determinant is:  ", D, "and the two real solutions are:  ", (-b+sqrt(D))/2*a, (-b-sqrt(D))/2*a)
elif D == 0:
    print ("Determinant equals to zero, so we have a double real root:  ", (-b)/2*a)
else:
    print ("Negative determinant. Two complex solutions:  ", complex ((-b)/2*a, sqrt(-D)/2*a), complex ((-b)/2*a, (-sqrt(-D)/2*a)))

print ("Thank you for using Quadratic!")