C++primer plus第六版课后编程题答案17.6

一开始看到题目这么长，差点就不想写了，而且感觉会很麻烦，但是最后想想，要有始有终，还是耐着性子写了下来，果然很麻烦的说~~~

但是还是写了，这样，到时候有人来到这里就不会出现找不到题目的问题！

ee.cpp

#include <iostream>#include <string>#include <fstream>using namespace std;static enum{Emp,Employee,Manager,Fink,Highfink};//不能写成小写的emp，否则在main175中无法创建对应的对象static void eatLine(){while(cin.get()!='\n')continue;};class emp{private:string fname;string lname;string job;public:emp(){fname="fdefault";lname="ldefault";job="jdefault";}emp(const string &fn,const string &ln,const string &j){fname=fn;lname=ln;job=j;}virtual void Data(ofstream &fout){//标记fout<<Emp<<endl;};virtual void save(ofstream &fout){Data(fout);fout<<fname<<endl;fout<<lname<<endl;fout<<job<<endl;};//保存到文本//读取文本virtual void getall(ifstream &fin){fin>>fname;fin>>lname;fin>>job;}virtual void speciality()const=0{cout<<"this is emp:"<<endl;}virtual void showAll()const{speciality();//用于区分cout<<"fullname:"<<fname<<"     lastname:"<<lname<<"  job:"<<job<<endl;}virtual void setAll(){//eatLine();//清除前面的输入speciality();cout<<"\nPlease enter the fullname:";//string ffname;//应该直接赋值给fname//getline(cin,fname);//eatLine();cin>>fname;cout<<"\nPlease enter the lastname:";//string llname;//getline(cin,lname);cin>>lname;cout<<"\nPlease enter the job:";//string llname;//getline(cin,job);cin>>job;//eatLine();}friend ostream&operator<<(ostream &os,const emp &e){e.showAll();//调用成员函数搞定return os;}virtual ~emp(){}};class employee:public emp{public:employee(){};employee(const string &fn,const string &ln,const string &j):emp(fn,ln,j){};virtual void speciality()const{cout<<"this is employee:"<<endl;}virtual void setAll(){emp::setAll();}virtual void showAll()const{//speciality();//这里无需调用，因为上一层已经调用过emp::showAll();}virtual void Data(ofstream &fout){//标记fout<<Employee<<endl;};virtual void save(ofstream &fout){emp::save(fout);//没有新元素};//保存到文本virtual void getall(ifstream &fin){emp::getall(fin);//fin>>fname>>lname>>job;}};class manager:virtual public emp{private:int inchargeof;protected:int InChargeOf()const{return inchargeof;};int &InChargeOf(){return inchargeof;};void setI(int i)//设置inchargeof{inchargeof=i;}public:manager(){};manager(const string &fn,const string &ln,const string &j,int c=0):emp(fn,ln,j),inchargeof(c){};manager(const emp &e,int ico):emp(e),inchargeof(ico){};manager(const manager &m):emp(m){inchargeof=m.inchargeof;}virtual void speciality()const{cout<<"This is manager:"<<endl;}virtual void showAll()const{emp::showAll();cout<<"inchargeof:"<<inchargeof<<endl;};virtual void setAll(){emp::setAll();cout<<"Enter the inchargeof:";//int n;cin>>inchargeof;eatLine();}virtual void Data(ofstream &fout){//标记fout<<Manager<<endl;};virtual void save(ofstream &fout){emp::save(fout);fout<<inchargeof<<endl;};//保存到文本virtual void getall(ifstream &fin){emp::getall(fin);fin>>inchargeof;//fin>>fname>>lname>>job;}};class fink:virtual public emp{private:string reportsto;protected:const string ReportsTo()const {return reportsto;};string &ReportsTo(){return reportsto;};void setRe(string str){reportsto=str;}public:fink(){};fink(const string &fn,const string &ln,const string &j,const string &rpo):emp(fn,ln,j),reportsto(rpo){}fink(const emp &e,const string &rpo):emp(e),reportsto(rpo){}fink(const fink &e):emp(e){reportsto=e.reportsto;}virtual void speciality()const{cout<<"this is fink:"<<endl;}virtual void showAll()const{emp::showAll();cout<<"Reportsto:"<<reportsto<<endl;}virtual void setAll(){emp::setAll();cout<<"Enter the reportsto:";//int n;//getline(cin,reportsto);cin>>reportsto;eatLine();//eatLine();}virtual void Data(ofstream &fout){//标记fout<<Fink<<endl;};virtual void save(ofstream &fout){emp::save(fout);fout<<reportsto<<endl;};//保存到文本virtual void getall(ifstream &fin){emp::getall(fin);fin>>reportsto;}};class highfink:public manager,public fink{public:highfink(){};highfink(const string &fn,const string &ln,const string &j,const string &rpo,int ico):emp(fn,ln,j),manager(fn,ln,j,ico),fink(fn,ln,j,rpo){}highfink(const emp &e,const string &rpo,int ico):emp(e),manager(e,ico),fink(e,rpo){}//注意这个构造是怎么构造的highfink(const fink &f,int ico):emp(f),fink(f),manager(f,ico){}//这样行不行呢？highfink(const manager &m,const string &rpo):emp(m),manager(m),fink(m,rpo){}highfink(const highfink &h):emp(h),manager(h),fink(h){}//这样可否？？virtual void speciality()const//const必须与emp一致，否则会隐藏原来的,而不是重载{cout<<"This is highfink:"<<endl;}virtual void showAll()const//注意大小写不要写错了{//out<<"here is !"<<endl;emp::showAll();cout<<"Inchargeof:"<<InChargeOf()<<"   ";cout<<"Reportsto:"<<ReportsTo()<<endl;/*manager::showAll();fink::showAll();*/}virtual void setAll(){emp::setAll();cout<<"Enter the inchargeof:";int incharge;cin>>incharge;cin.get();//吃掉\nsetI(incharge);cout<<"Enter the reportsto:";string res;cin>>res;setRe(res);/*manager::setAll();fink::setAll();*/}virtual void getall(ifstream &fin){emp::getall(fin);int i;fin>>i;setI(i);string str;fin>>str;setRe(str);}virtual void Data(ofstream &fout){//标记fout<<Highfink<<endl;};virtual void save(ofstream &fout){//要特殊处理emp::save(fout);//Data(fout);int n=InChargeOf();fout<<n<<endl;string str=ReportsTo();fout<<str<<endl;};//保存到文本};

main176.cpp

//没有按照他说的那个命令行参数，因为觉得不用打开多个文件

#include <iostream>#include "ee.cpp"#include <fstream>#include <cstdlib>//for exitusing namespace std;static const int MAX=1;//int main(int argc,char *argv[])int main(){emp *pc[MAX];ofstream fout;ifstream fin("data.txt");if(!fin.is_open()){cout<<"FIN fail"<<endl;return 0;}//showchar s;emp *p;while(!fin.eof()&&fin.good()){fin>>s;if(s=='\n')break;//如果到了最后一个换行switch(s){case '1':p=new employee;break;case '2':p=new manager;break;case '3':p=new fink;break;case '4':p=new highfink;break;default:;break;}p->getall(fin);p->showAll();cout<<endl<<endl;}fin.close();//先读取，再写入fout.open("data.txt",ios_base::app);//原来是二进制文件无法追加//||ios_base::binary);if(!fout.is_open()){cout<<"Open fail!"<<endl;eatLine();return 1;}char ch='0';int i=0;while(ch!='q'&&i<MAX){cout<<"Please enter the choice (q to quit):"<<endl<<"1.employee        2.manager"<<endl<<"3.fink            4.highfink"<<endl;cin>>ch;switch(ch){case '1':pc[i]=new employee;break;case '2':pc[i]=new manager;break;case '3':pc[i]=new fink;break;case '4':pc[i]=new highfink;break;default:;break;}//eatLine();cin.get();pc[i]->setAll();pc[i]->showAll();pc[i]->save(fout);fout.flush();i++;}fout.close();cin.get();return 0; }