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20501.py
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30 lines (26 loc) · 664 Bytes
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#!/usr/bin/env python
# coding=utf-8
"""
solving a quadratic equation
"""
from __future__ import division
import math
def quadratic_equation(a,b,c):
delta = b*b - 4*a*c
if delta<0:
return False
elif delta==0:
return -(b/(2*a))
else:
sqrt_delta = math.sqrt(delta)
x1 = (-b + sqrt_delta)/(2*a)
x2 = (-b - sqrt_delta)/(2*a)
return x1, x2
if __name__ == "__main__":
print "a quadratic equation: x^2 + 3x + 2 = 0"
coefficients = (1, 3, 2)
roots = quadratic_equation(*coefficients)
if roots:
print "the result is:",roots
else:
print "this equation has no solution."