import math
def quadratic(a,b,c):
if isinstance(a,(int,float)):
if isinstance(b,(int,float)):
if isinstance(c,(int,float)):
s = pow(b,2) - 4*a*c
if s<0:
return('pleae input true value')
elif a==0:
return('The denominator can not be zero')
else:
x1 = (-b + math.sqrt(pow(b,2)-4*a*c))/(2*a)
x2 = (-b - math.sqrt(pow(b,2)-4*a*c))/(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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凡九朵
import math
def quadratic(a,b,c):
if isinstance(a,(int,float)):
if isinstance(b,(int,float)):
if isinstance(c,(int,float)):
s = pow(b,2) - 4*a*c
if s<0:
return('pleae input true value')
elif a==0:
return('The denominator can not be zero')
else:
x1 = (-b + math.sqrt(pow(b,2)-4*a*c))/(2*a)
x2 = (-b - math.sqrt(pow(b,2)-4*a*c))/(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')