C++ primer plus 第五版 6章4题

Myth丶恋晨 2022-07-10 09:29 196阅读 0赞

#include <iostream>
    const int strsize=20;
    struct bop {
       
     char fullname[strsize];
     char title[strsize];
     char bopname[strsize];
     int preference;//0=fullname  1=title  2=bopname
    };

int main()//主函数
    {
       
     using namespace std;
     const int size=5;
     bop stru[size]={            //初始化结构数组
      {"王","程序员","wang",2},
      {"李","数学家","li",1},
      {"史","高级程序员","shi",1},
      {"孟","工程师","meng",0},
      {"肖","设计师","xiao",2}
     };

cout << "Benevolent Order of Programmers Report/n"
      <<"a. display by name      b. display by title/n"
      <<"c. display by bopname   d. display by preference/n"
      <<"q. quit/n";
     cout << "Enter your choice: ";
     char ch;
     cin >>ch;
     while (ch!='q')         //ch不是q时循环
     {
       
      if (!(ch>='a'&&ch<='d'))      //ch不在a到d之间,重新选择 
       cout << "Please enter a a,b,c,d or q: ";
      else if (ch>='a'&&ch<='d')        //ch在a到d之间选择分支语句
      {
       
       switch (ch)
       {
       
       case 'a':for (int i=0;i<size;++i)
          {
       
           cout <<stru[i].fullname <<endl;
          }
          cout <<"Next choice: ";
          break;   
       case 'b':for (int i=0;i<size;++i)
          {
       
            cout <<stru[i].title <<endl;
          }
          cout <<"Next choice: ";
          break;  
       case 'c':for (int i=0;i<size;++i)
          {
       
           cout <<stru[i].bopname <<endl;
          }
          cout <<"Next choice:";
          break;
       case 'd':for (int i=0;i<size;++i)
          {
       
           if (stru[i].preference==0)
              cout << stru[i].fullname<<endl;
           else if (stru[i].preference==1)
            cout <<stru[i].title <<endl;
           else cout <<stru[i].bopname <<endl;
          }
          cout <<"Next choice: ";    
          break;
       }
      }
      cin >>ch;//再次输入ch
     }
        cout <<"Bye!/n";
         
     return 0;
    }