用map统计一篇文章里每个单词出现的次数

/*原文如下：

While the rest of the northern hemisphere was thrown into chaos by the recent cold snap, conditions were perfect this week in Harbin, northeast China, where giant buddhas, skyscrapers and even the Sphinx have been rendered in ice.*/

#include<iostream>

#include<string>

#include<map>

#include<fstream>

using namespace std;

int main()

{

    map<string,int> imap;

    string word;

    ifstream input;

    input.open("test.txt");

    while(input>>word)

    {

                      imap[word]++;

    }

    for(map<string,int>::const_iterator itr=imap.begin();itr!=imap.end();itr++)

    {

                                       if((*itr).first.size()<=7)

                                        cout<<(*itr).first<<"\t\t"<<(*itr).second<<endl;

                                        else

                                         cout<<(*itr).first<<"\t"<<(*itr).second<<endl;

    }

    getchar();

    return 0;

}

/*Output：

China,          1

Harbin,         1

Sphinx          1

While           1

and             1

been            1

buddhas,        1

by              1

chaos           1

cold            1

conditions      1

even            1

giant           1

have            1

hemisphere      1

ice.            1

in              2

into            1

northeast       1

northern        1

of              1

perfect         1

recent          1

rendered        1

rest            1

skyscrapers     1

snap,           1

the             4

this            1

thrown          1

was             1

week            1

were            1

where           1

*/