operator/ function template Performs division

template<typename T>
  complex<T> operator/(const complex<T>&, const complex<T>&);
template<typename T>
  complex<T> operator/(const complex<T>&, const T&);
template<typename T>
  complex<T> operator/(const T&, const complex<T>&);

The binary / operator performs complex division. If either operand is of type T, the argument is interpreted as the real part, with an imaginary part of T( ) or 0. Division by zero results in undefined behavior.