// file: phn_cstr_3.cc//// isip include files//#include "phone.h"#include "phone_constants.h"// method: constructor//// arguments://  const Phone& phone : (input) phone model to copy//// return: none//// this is a copy constructor//Phone::Phone(const Phone& phone_a) {  // initialize name of the phone  //  name_d = new char_1[strlen((char*)phone_a.name_d) + (int_4)1];  strcpy((char*)name_d, (char*)phone_a.name_d);    // set the phone indices  //  num_phones_d = phone_a.num_phones_d;  phones_d = new int_4[num_phones_d];  for (int_4 i = 0; i < num_phones_d; i++) {    phones_d[i] = phone_a.phones_d[i];  }    // set the model pointer  //  model_d = phone_a.model_d;  active_d = phone_a.active_d;    // exit gracefully  //}