VC++ 输入流迭代器

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输入一些单词，中间使用空格分隔，最后统计每个单词出现的次数。

#include "stdafx.h"#include <iostream>#include <string>#include <tuple>#include <iomanip>#include <array>#include <map>#include <functional>using std::cin;using std::cout;using std::endl;using std::tuple;using std::string;using std::setw;using std::get;using std::pair;using std::map;int main(int argc,_TCHAR* argv[]){std::map<string,int> words;cout<<"Enter some text and press Enter followed by Ctrl+Z then Enter to end:"<<endl<<endl;std::istream_iterator<string> begin(cin); //Stream  iteratorstd::istream_iterator<string> end;while(begin!=end)//Iterate over words in the streamwords[*begin++]++;//Increment and store a word countcout<<endl<<"Here a the world counts for the text you entered:"<<endl;const int wordsPerLine(4);int wordCount(0);cout<<std::setiosflags(std::ios::left);for(auto& word:words){cout<<std::setw(15)<<word.first<<" "<<std::setw(5)<<word.second;if(++wordCount % wordsPerLine ==0) cout<<endl;}cout<<endl;return 0;}

运行结果如下：

0 0