Answer to Question parameter-1

void sum(const Complex& a, const Complex& b, Complex& c)
{
  c.repart = a.repart + b.repart;
  c.impart = a.impart + b.impart;
}

void sum(const Complex& a, const Complex& b, Complex& c)
{
  c = Complex(a.repart + b.repart, a.impart + b.impart);
}