統計一篇英文文章中單詞出現的頻率（為簡單起見，假定依次從鍵盤輸入該文章）

關鍵字是string型別

#include<bits/stdc++.h>
using namespace std;
int main()  
{
	map<string, int> wordCount;      //map
	string word;                     //string
	while ( cin >> word )
		++wordCount[word];           //單詞頻率統計
	map<string, int>::iterator it ;
	for ( it= wordCount.begin();  it != wordCount.end();  ++it)
		cout<<"Word: "<<(*it).first     
		<<" \tCount:"<<(*it).second<<endl;
	return 0;
}
 

輸出：