Method __mul__

Chapter 11 - PS/04_problem4.py:9–12

(self, c2)

        return Complex(self.r + c2.r, self.i + c2.i)
    
    def __mul__(self, c2):
        real_part = self.r * c2.r - self.i * c2.i
        imag_part = self.r * c2.i + self.i * c2.r
        return Complex(real_part, imag_part)
    
    def __str__(self):
        return f"{self.r} + {self.i}i"