C++ primer 习题10.9

#include <iostream>
#include <string>
#include <map>
using namespace std;
int main()
{
    map<string,int> word_count;
    string word;
    cout<<"请输入若干单词，以Ctrl+Z结束:"<<endl;
    while(cin>>word)
    {
        ++word_count[word];
       
                    }
    map<string,int>::iterator iter_map;
    for(iter_map=word_count.begin();iter_map!=word_count.end();++iter_map)                                                           
    cout<<"单词："<<iter_map->first<<"  出现次数:"<<iter_map->second<<endl;
    system("pause");
    return 0;
    }