import math def quadratic(a,b,c): if not isinstance (a,(int ,float ))and isinstance (b,(int,float))and isinstance (c,(int,float)): raise TypeError('bad operand type ') s = bb-4ac if a == 0: x1 = -c/b print ('该方程有唯一解：x= %.1f' %x1) elif c == 0: x1 = 0; x2 = -b/a print ('该方程有两个解：x1= %.1f，x2= %.1f' %(x1 ,x2)) elif s >= 0: x1 = (-b + math.sqrt(s))/(2a); x2 = (-b - math.sqrt(s))/(2*a); print ('该方程有两个解：x1= %.1f,x2= %.1f'%(x1,x2)) else : print ('该方程无实数解')
结果是这样：
该方程有两个解：x1= -0.5,x2= -1.0 None 该方程有两个解：x1= 1.0,x2= -4.0 None
为什么会有 None，哪来的
s = bb-4ac这么写不对的，应该是s=bb-4a*c
写错了，是s=bb-4a*c
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loveKD92
-- coding: utf-8 --
import math def quadratic(a,b,c): if not isinstance (a,(int ,float ))and isinstance (b,(int,float))and isinstance (c,(int,float)): raise TypeError('bad operand type ') s = bb-4ac if a == 0: x1 = -c/b print ('该方程有唯一解：x= %.1f' %x1) elif c == 0: x1 = 0; x2 = -b/a print ('该方程有两个解：x1= %.1f，x2= %.1f' %(x1 ,x2))
elif s >= 0: x1 = (-b + math.sqrt(s))/(2a); x2 = (-b - math.sqrt(s))/(2*a); print ('该方程有两个解：x1= %.1f,x2= %.1f'%(x1,x2)) else : print ('该方程无实数解')