Answer to Question 29B-1

// An object of type Complex is a complex number.  It has
// a real part (rePart) and an imaginary part (imPart).

struct Complex
{
  double rePart, imPart;
};


// sum(a,b,c) sets c = a + b.

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