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发表于 2017-7-26 20:21:19
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import math
def quadratic(a,b,c):
if not isinstance(a,(int,float)):
raise TypeError('a is not a number')
if not isinstance(b,(int,float)):
raise TypeError('b is not a number')
if not isinstance(c,(int,float)):
raise TypeError('c is not a number')
d=b*b-4*a*c
if a==0:
if b==0:
if c==0:
return '方程根为全体实数'
else:
return '方程无根'
else:
x1=-c/b
x2=x1
return x1,x2
else:
if d<0:
return '方程无根'
else:
x1 = (-b + math.sqrt(d))/2/a
x2 = (-b - math.sqrt(d))/2/a
return x1,x2
print(quadratic(2,3,1))
print(quadratic(1,3,-4) |
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