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quadratic.py
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quadratic.py
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#!/usr/bin/env python3
# Copyright (c) 2008 Qtrac Ltd. All rights reserved.
# This program or module is free software: you can redistribute it and/or
# modify it under the terms of the GNU General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version. It is provided for educational
# purposes and is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
import cmath
import math
import sys
def get_float(msg, allow_zero):
x = None
while x is None:
try:
x = float(input(msg))
if not allow_zero and abs(x) < sys.float_info.epsilon:
print("zero is not allowed")
x = None
except ValueError as err:
print(err)
return x
print("ax\N{SUPERSCRIPT TWO} + bx + c = 0")
a = get_float("enter a: ", True)
b = get_float("enter b: ", True)
c = get_float("enter c: ", True)
x1 = None
x2 = None
discriminant = (b ** 2) - (4 * a * c)
if a:
if discriminant == 0:
x1 = -(b / (2 * a))
else:
if discriminant > 0:
root = math.sqrt(discriminant)
else: # discriminant < 0
root = cmath.sqrt(discriminant)
x1 = (-b + root) / (2 * a)
x2 = (-b - root) / (2 * a)
equation="{0}x\N{SUPERSCRIPT TWO}".format(a)
if b:
equation+= "{0:+}x".format(b)
if c:
if b:
equation+="{0:+}".format(c)
else:
equation+=str(c)
equation+=" \N{RIGHTWARDS ARROW} x = {0}".format(x1)
if x2 is not None:
equation += " or x = {0}".format(x2)
print(equation)
else:
print("It is not quadratic equation.")