-- coding: utf-8 --

import math

def quadratic(a, b, c): if(bb-4ac>=0): x1=((-b+math.sqrt(bb-4ac))/2/a) x2=((-b-math.sqrt(bb-4a*c))/2/a) return x1,x2 else: pass print('quadratic(1, 3, -4) =', quadratic(1, 3, -4)) quadratic(1, 3, -4) = (1.0, -4.0) print('quadratic(2, 3, 1) =', quadratic(2, 3, 1)) quadratic(2, 3, 1) = (-0.5, -1.0)
if quadratic(2, 3, 1) != (-0.5, -1.0): print('测试失败') elif quadratic(1, 3, -4) != (1.0, -4.0): print('测试失败') else: print('测试成功')