complex complex operator- complex c2)∥重载函数实现 complex C, c. realreal-C2real; Cimag=- C2 imag return complex(c real, C imag)complex complex:: operator -(complex c2) //重载函数实现 { complex c; c.real=real-c2.real; c.imag=imag-c2.imag; return complex(c.real,c.imag); }