##language:zh
#acl Known:read,write All:read
----
MyNewPage
'刚入门，你还要留我多长时间？才肯放我晋级行者啊！！！！'

'自己编写的一个小小简单python程序' 为什么没缩进啊？？？？

'''#ax^2+bx+c=0 解二次方程的根<<BR>>import math<<BR>>def getroot(a,b,c):<<BR>> if a==0:<<BR>> if b!=0:<<BR>> r1=r2=-c/b<<BR>> else:<<BR>> r1=r2=None<<BR>> print('a,b,c!=0')<<BR>> else:<<BR>> d=b**2-4*a*c<<BR>> e1=-b+math.sqrt(abs(d))<<BR>> e2=-b-math.sqrt(abs(d))<<BR>> if d>0:<<BR>> r1=e1/(2*a)<<BR>> r2=e2/(2*a)<<BR>> elif d==0:<<BR>> r1=r2=-b/(2*a)<<BR>> else:<<BR>> r1=r2=None<<BR>> print('无根')<<BR>> return(r1,r2)'''

'''a=['a','b','c']<<BR>>b=[0,0,0]<<BR>>for i in range(3):<<BR>> a[i]=input("please float integer %s="%a[i])<<BR>> if a[i]:<<BR>> try:<<BR>> b[i]=float(a[i])<<BR>> except ValueError as err:<<BR>> print(err)<<BR>> break<<BR>>if ValueError:<<BR>> pass<<BR>>else: print('方程的根为:',getroot(b[0],b[1],b[2]))<<BR>>'''
#coding:utf-8

import math

def getroot(a,b,c):
    if a==0:
        if b!=0:
            r1=r2=-c/b
        else:
            r1=r2=None
            print('a,b,c!=0')
    else:
        d=b**2-4*a*c
    e1=-b+math.sqrt(abs(d))

    e2=-b-math.sqrt(abs(d))
    if d>0:
        r1=e1/(2*a)
        r2=e2/(2*a)
    elif d==0:
        r1=r2=-b/(2*a)
    else:
        r1=r2=None

        print('无根')

        return(r1,r2)

a=['a','b','c']

b=[0,0,0]

for i in range(3):
    a[i]=input("please float integer %s="%a[i])
    if a[i]:
        try:
            b[i]=float(a[i])
        except ValueError as err:
            print(err)
            break
        if ValueError:
            pass
        else:
            print('方程的根为:',getroot(b[0],b[1],b[2]))

["PythonLearningPlan"] ["MyNewPage"]