关联式容器映射map练习

//管理学生名册

‍#include <iostream>

#include <map>

#include <string>

using namespace std;

struct student

{

string id;

string name;

int grade;

};

int main()

{

map<string,student> stubook;

student stu;

cout<<"--creat student book--"<<endl;

for(int i=0;i<2;i++)

{

   cin>>stu.id;

   cin>>stu.name;

   cin>>stu.grade;

   stubook[stu.id]=stu;

}

//判断student book是否为空

if(stubook.empty()) cout<<"stubook is empty!"<<endl;

else cout<<"stubook isnot empty!"<<stubook.size()<<endl;

//输出student book

cout<<"---print student book--"<<endl;

map<string,student>::iterator iter=stubook.begin();

for( ;iter!=stubook.end();iter++)

{

cout<<"student book:"<<iter->second.id<<" - "<<iter->second.name<<" -"<<iter->second.grade<<endl;

}

//查找学生

cout<<"---find a student(please input studentid)--"<<endl;

string studentid;

cin>>studentid;

iter=stubook.find(studentid);

if(iter==stubook.end())

{

   cout<<"cannot find: "<<studentid<<endl;

}

else

{

   cout<<"student: "<<iter->second.id<<" - "<<iter->second.name<<" - "<<iter->second.grade<<endl;

   cout<<"do you want to delete the student (y/n):"<<endl;

   char c;

   cin>>c;

   if(c=='y')

   {

     stubook.erase(studentid);

   }

      

}

//输出student book

cout<<"---print student book--"<<endl;

map<string,student>::iterator iter2=stubook.begin();

for( ;iter2!=stubook.end();iter2++)

{

cout<<"student book:"<<iter2->second.id<<" - "<<iter2->second.name<<" -"<<iter2->second.grade<<endl;

}

return 0;

}