初始化文本文件中的向量 [英] Initializing a vector from a text file

问题描述

我正在尝试编写一个程序，该程序可以在文本文件中读取，并将其中的每个单词作为字符串类型向量中的条目存储.我确定我做错了，但是自从尝试这样做以来已经很久了，以至于我忘记了它是如何完成的.任何帮助是极大的赞赏.预先感谢.

I am attempting to write a program which can read in a text file, and store each word in it as an entry in a string type vector. I am sure that I am doing this very wrong, but it has been so long since I have tried to do this that I have forgotten how it is done. Any help is greatly appreciated. Thanks in advance.

代码:

#include <iostream>
#include <fstream>
#include <vector>
#include <string>

using namespace std;

int main()
{
    vector<string> input;
    ifstream readFile;

    vector<string>::iterator it;
    it = input.begin();

    readFile.open("input.txt");

    for (it; ; it++)
    {
        char cWord[20];
        string word;

        word = readFile.get(*cWord, 20, '\n');

        if (!readFile.eof())
        {
            input.push_back(word);
        }
        else
            break;
    }

    cout << "Vector Size is now %d" << input.size();

    return 0;
}

推荐答案

许多可能的方法之一是简单的:

One of the many possible ways is a simple:

std::vector<std::string> words;
std::ifstream file("input.txt");

std::string word;
while (file >> word) {
    words.push_back(word);
}

运算符>>> 仅处理被读取的单词，该单词除以空格(包括换行符)而被读取.

operator >> takes care of only words divided by whitespaces (including new-lines) being read.

如果要按行读取它，则可能还需要显式处理空行:

And in case you would be reading it by lines, you might also need to explicitly handle empty lines:

std::vector<std::string> lines;
std::ifstream file("input.txt");

std::string line;
while ( std::getline(file, line) ) {
    if ( !line.empty() )
        lines.push_back(line);
}

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