【C++ Primer Plus习题】6.4

问题:

解答:

#include <iostream>
using namespace std;const int strsize = 40;
const int usersize = 40;typedef struct _Bop
{char fullname[strsize];char title[strsize];char bopname[strsize];int preference;
}Bop;Bop bop_user[usersize] =
{{"Wimp Macho","Programmer","MIPS",0},{"Raki Rhodes","Junior Programmer","",1},{"Celia Laiter","","MIPS",2},{"Hoppy Hipman","Analyst Trainee","",1},{"Pat Hand","","LOOPY",2}
};void showmenu();
void print_by_name();
void print_by_pref();
void print_by_title();
void print_by_bopname();int main()
{char choice;showmenu();cin.get(choice);while (choice!='q'){switch (choice){case 'a':print_by_name();break;case 'b':print_by_title();break;case 'c':print_by_bopname();break;case 'd':print_by_pref();break;default:cout << "请输入a,b,c,d or q" << endl;}cin.get();cout << "下一次输入:";cin.get(choice);}cout << "Bye!" << endl;return 0;
}void showmenu()
{cout << "a.display by name\t\tb.display by title" << endl;cout << "c.display by bopname\t\td.display by preference" << endl;cout << "q.quit"<<endl;
}
void print_by_name()
{for (int i = 0; i < usersize; i++){if (strlen(bop_user[i].fullname) == 0){break;}else{cout << bop_user[i].fullname << endl;}}
}
void print_by_pref()
{for (int i = 0; i < usersize; i++){if (strlen(bop_user[i].fullname) == 0){break;}else{switch (bop_user[i].preference){case 0:cout << bop_user[i].fullname << endl;break;case 1:cout << bop_user[i].title << endl;break;case 2:cout << bop_user[i].bopname << endl;break;}}}
}void print_by_title()
{for (int i = 0; i < usersize; i++){if (strlen(bop_user[i].fullname) == 0){break;}else{cout << bop_user[i].title << endl;}}
}
void print_by_bopname()
{for (int i = 0; i < usersize; i++){if (strlen(bop_user[i].fullname) == 0){break;}else{cout << bop_user[i].bopname << endl;}}
}