////      ostream_complex.cc      Add I/O routine for printing out complex//                              numbers.//#ifdef COMPLEX_OSTREAM#include <complex.h>#include <iostream>// AT&T Cfront does not provide for cout << complex ...//std::ostream& operator<<(std::ostream &s, COMPLEX z){    s << (double) real(z) << " "  << (double) imag(z) ;    return s;}#endif