C++ map表的应用

map表可以存储数据对应关系

#include <map>
#include <string>
#include <iostream>
using namespace std;int main()
{
       map<int, string> mapStudent;
       mapStudent.insert(pair<int, string>(5, "student_one"));
       mapStudent.insert(pair<int, string>(2, "student_two"));
       mapStudent.insert(pair<int, string>(3, "student_three"));
       mapStudent.insert(pair<int, string>(1, "student_four"));       
       map<int, string>::iterator iter;
       for(iter = mapStudent.begin(); iter != mapStudent.end(); iter++)
       {
          cout<<iter->first<<"   "<<iter->second<<endl;
       }      
       cout<<"删除后："<<endl;       
       int is = mapStudent.erase(1);
       for(iter = mapStudent.begin(); iter != mapStudent.end(); iter++)
       {
          cout<<iter->first<<"   "<<iter->second<<endl;
       }       
       cout<<"清空全部："<<endl;
       mapStudent.erase(mapStudent.begin(), mapStudent.end());
       for(iter = mapStudent.begin(); iter != mapStudent.end(); iter++)
       {
          cout<<iter->first<<"   "<<iter->second<<endl;
       }
}
 

编译

gcc -lstdc++ -o mapmap mapmap.cpp
./mapmap

结果

1   student_four
2   student_two
3   student_three
5   student_one
删除后：
2   student_two
3   student_three
5   student_one
清空全部：