map 顾名思义就是地图,包含key和value
当需要快速获取key和value的时候,就可以用map了
首先,我给出基本的用法插入数据的代码:
1.map<int, string> mapStudent;
mapStudent.insert(pair<int, string>(1, "student_one"));
mapStudent.insert(pair<int, string>(2, "student_two"));
mapStudent.insert(pair<int, string>(3, "student_three"));
mapStudent.insert(pair<int, string>(4, "student_four"));
map<int, string>::iterator i;
for (i = mapStudent.begin(); i != mapStudent.end(); i++)
{
cout << i->first << " " << i->second << endl;
}
2.map<int,string> mapStudent;
mapStudent.insert(map<int, string>::value_type(1, "student_one"));
mapStudent.insert(map<int, string>::value_type(2, "student_two"));
mapStudent.insert(map<int, string>::value_type(3, "student_three"));
mapStudent.insert(map<int, string>::value_type(4, "student_four"));
map<int, string>::iterator i;
for (i = mapStudent.begin(); i != mapStudent.end(); i++)
{
cout << i->first << " " << i->second << endl; //java怎么遍历?这个过几天给出
}
3.map<int, string> mapStudent;
mapStudent[1] = "student_one";
mapStudent[2] = "student_two";
mapStudent[3] = "student_three";
mapStudent[4] = "student_four";
map<int, string>::iterator i;
mapStudent.clear();
for (i = mapStudent.begin(); i != mapStudent.end(); i++)
{
cout << i->first << " " << i->second<< endl;
}
简单的就这三种。