import math

def quadratic(a,b,c):

    if a==0:

        if b==0:

            print("a,b不能同时为0")

        else:

            return -c/b

    else:

        delt=b**2-4*a*c

        int(delt)

        if delt>0:

            x1=(-b+math.sqrt(delt))/(2*a)

            x2=(-b-math.sqrt(delt))/(2*a)

            return x1,x2

        elif delt==0:

            x=(-b+math.sqrt(delt))/(2*a)

            return x

        else:

            return ("无解")

a1=int(input("请输入a值:"))

b1=int(input("请输入b值:"))

c1=int(input("请输入c值:"))

print("quadratic(%d, %d, %d)="%(a1,b1,c1),quadratic(a1,b1,c1))

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')