5 map类型 关联容器

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

using std::cout;
using std::string;
using std::map;
using std::endl;
using std::cin;
using std::pair;

int main()
{
    mapword_count;
    //insert a element
    word_count["anna"] = 1;

    cout << word_count["anna"] << endl;
    ++word_count["anna"];
    cout << word_count["anna"] << endl;

//////////////////////////////////////////////////////////////
    //calculation word number
#if 0
    map<string,int> word_count1;
    string word;
    while(cin >> word)
    {
        ++word_count1[word];
        cout << word_count1[word] << endl;
    }
#endif

    map<string,int>word_count2;
//    word_count2.insert(map<string,int>::value_type("bnna",1));

    typedef map::value_type valType;
    word_count2.insert(valType("bnna",1));

//    word_count2.insert(make_pair("bnna",1));
    cout << word_count2["bnna"] << endl;
//////////////////////////////////////////////////////

    // using count check the key if exists
    int occurs = 0;
    if(word_count2.count("bnna"))//if can find bnna element
    {
        occurs = word_count2["bnna"];
        cout << occurs << endl;
    }
    else
        cout << "cann't find " << endl;

    //read elements but do not insert element by using find
    int occurs1 = 0;
    map::iterator it = word_count2.find("bnna");
    if(it != word_count2.end())
        cout << it->second << endl;

    // using erase() delete element
    if(word_count2.erase("bnna"))
        cout << "ok " << " bnna " << " removed\n";
    else
        cout << "oops:" << "bnna" << "not found\n";

    return 0;
}

ywx@ywx:~/desktop/yu$ ./map
1
2
1
1
1
ok  bnna  removed