词频统计(一)：C++使用Vector做词频统计

本文主要是介绍词频统计(一)：C++使用Vector做词频统计，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

统计圣经中每个单词出现的次数。

#include <iostream>
#include <vector>
#include <fstream>
#include <string>
#include <string.h>
#include <sstream>struct Record
{std::string word;int freq;
};class WordStatic
{
public://1,传引用，减少开销 2.const修饰，防止修改void read_file(const std::string & filename);void write_file(const std::string &  filename);
private:std::vector<Record> vec;
};void WordStatic::read_file(const std::string &filename)
{//逐行读取，将行读入字符串std::ifstream ifs(filename.c_str());std::string str;if(ifs.good() == 0){std::cout << "open readfile failed" << std::endl;return;}while(getline(ifs,str)){std::stringstream ss(str);std::string word;while(ss >> word){//std::cout<< word << std::endl;std::vector<Record>::iterator it;for(it = vec.begin(); it !=vec.end(); ++it){//string 重载了等号if(word == (*it).word){(*it).freq +=1;break;}}if(it == vec.end()){Record newRe;newRe.word = word;newRe.freq = 1;vec.push_back(newRe);}}}ifs.close();
}void WordStatic::write_file(const std::string & filename)
{//从流中写数据std::vector<Record>::iterator it;std::ofstream ofs(filename);if(ofs.good() == 0){std::cout << "open write_file failed" << std::endl;}for(it = vec.begin(); it != vec.end(); ++it){ofs << (*it).word << " " << (*it).freq << std::endl;//std::cout << (*it).word << " " << (*it).freq << std::endl;}ofs.close();
}
int main(void)
{WordStatic wd;wd.read_file("The_Holy_Bible.txt");wd.write_file("statics.txt");return 0;
}