#include?<iostream.h>#include?"stdlib.h"class?CComplex{public:CComplex(double?r?=?0,?double?i?=?0){??real?=?r;??imag?=?i;}int?operator?int(){??return?(int)real;}void?Display(void){??cout?<<?"("?<<?real?<<?","?<<?imag?<<?")"?<<?endl;}protected:double?real;double?imag;};class?CVector{public:CVector(CComplex?&obj1,?CComplex?&obj2,?CComplex?&obj3,?CComplex?&obj4){??objArray[0]?=?obj1;??objArray[1]?=?obj2;??objArray[2]?=?obj3;??objArray[3]?=?obj4;}friend?CComplex?&operator[](CVector?obj,?int?n);private:CComplex?objArray[4];};CComplex?&operator[](CVector?obj,?int?n){if(n<0?||?n>3){??cout<<"Out?of?range!"<<endl;??exit(0);}return?obj.objArray[n];}void?main(){CComplex?c1(1.1,?1.1);CComplex?c2(2.2,?2.2);CComplex?c3(3.3,?3.3);CComplex?c4(4.4,?4.4);CVector?v(c1,c2,c3,c4);v[0].Display();v[1].Display();v[2].Display();v[3].Display();v[0]?=?5.5;?----------------------------------------------------------①v[1]?=?CComplex(6.6);?-------------------------------------------②v[2]?=?int(CComplex(7.7));?--------------------------------------③v[3]?=?int(CComplex(8.8,9.9));?----------------------------------④v[0].Display();v[1].Display();v[2].Display();v[3].Display();}