C++ primer 习题练习：10.9

#include<string>
#include<map>
#include<iostream>
using namespace std;
//显示
void show(const map<string,int> &smap)
{
	for(map<string,int>::const_iterator iter=smap.begin();iter!=smap.end();++iter)
	{
		cout<<iter->first<<":"<<iter->second<<endl;
	}
}
int main()
{
	map<string,int> word_count;
	string word;
	while(cin>>word)
	{
		++word_count[word];
	}
	show(word_count);
}