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20501p3.py
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28 lines (25 loc) · 644 Bytes
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#!/usr/bin/env python
# coding=utf-8
"""
solving a quadratic equation
"""
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 + 2x + 1 = 0")
coefficients = (1, 2, 1)
roots = quadratic_equation(*coefficients)
if roots:
print("the result is:{}".format(roots))
else:
print("this equation has no solution.")