# -*- coding: utf-8 -*-
import math
def quadratic(a, b, c):
if isinstance(a,(int,float)):
if isinstance(b,(int,float)):
if isinstance(c,(int,float)):
s=b**2-4*a*c
if s<0:
return("不合理的输入,平方根不可能为0")
elif a==0:
return("不合理的输入,分母不能为0")
else:
x1=(-b+math.sqrt(s))/(2*a)
x2=(-b-math.sqrt(s))/(2*a)
return x1,x2
raise TypeError('c')
raise TypeError('b')
raise TypeError('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('测试成功')
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# -*- coding: utf-8 -*-
import math
def quadratic(a, b, c):
if isinstance(a,(int,float)):
if isinstance(b,(int,float)):
if isinstance(c,(int,float)):
s=b**2-4*a*c
if s<0:
return("不合理的输入,平方根不可能为0")
elif a==0:
return("不合理的输入,分母不能为0")
else:
x1=(-b+math.sqrt(s))/(2*a)
x2=(-b-math.sqrt(s))/(2*a)
return x1,x2
else:
raise TypeError('c')
else:
raise TypeError('b')
else:
raise TypeError('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')