c++ map使用示例

1.源码实现

#include <iostream>
#include <string>
#include <map>

using namespace std;

int main()
{
    map<int, string> mapStudent;
    map<int, string>::iterator it;

    /*插入数据*/
    mapStudent.insert(pair<int, string>(1, "student one"));
    mapStudent.insert(pair<int, string>(2, "student two"));
    mapStudent.insert(pair<int, string>(3, "student three"));

    cout << "2: " << mapStudent[2] << endl;

    /*遍历数据*/
    for(it=mapStudent.begin(); it!=mapStudent.end(); it++)
    {
        cout << it->first << ": " << it->second << endl;
    }

    /*清空数据*/
    mapStudent.clear();

    /*遍历数据*/
    for(it=mapStudent.begin(); it!=mapStudent.end(); it++)
    {
        cout << it->first << ": " << it->second << endl;
    }

    return 0;
}

2.编译源码

$ g++ -o example example.cpp

3.运行及其结果

$ ./example
2: student two
1: student one
2: student two
3: student three