# -*- coding: utf-8 -*- import math def quadratic(a, b, c): #输入框 dlt= b**2 - 4*a*c #DELTA值 if dlt == 0: return -b/(2*a) #等于0 唯一解 if dlt < 0: return '对应系数组无解' #小于零无解 # raise ValueError('对应系数组无解') #或如果允许参数错误可使用发出错误 else: return (-b+math.sqrt(dlt))/(2*a),(-b-math.sqrt(dlt))/(2*a) # 测试: print('quadratic(2, 3, 1) =', quadratic(2, 3, 1)) print('quadratic(1, 3, -4) =', quadratic(1, 3, -4)) 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')
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