Quadratic equation: TypeError: bad operand type for unary -: 'str'-CodePudding

I´m new to Python and have been trying to code the quadratic equation, but i keep running into this error: TypeError: bad operand type for unary -: 'str'

def quad_gleichung():
a = input('a:')
b = input('b:')
c = input('c:')

x1 = int(-b   (b**2 - (4*a*c))**(0.5)) / (2*a)
x2 = int(-b - (b**2 - (4*a*c))**(0.5)) / (2*a)


print('Lösung 1:', x1)
print('Lösung 2:', x2)

quad_gleichung()

Can anyone please help me?

Thanks!

CodePudding user response：

The return type of input is string. It needs to be converted to some number type, float or int, depending on use case.

Therefore, change the assignments to a, b, c to:

a = int(input("a: ")) # or float(input("a: "))
b = int(input("b: ")) # or float(input("b: "))
c = int(input("c: ")) # or float(input("c: "))