c++ - 从多行代码 C++ 中获取一个单词

Question

我有一个包含不同数量的单词/行的文本文件。一个例子是：

Hi

My name is Joe

How are you doing?

我想抓住用户输入的任何内容。所以如果我搜索乔，它会得到那个。不幸的是，我只能输出每一行而不是单词。我有一个向量逐行保存这些中的每一个

vector<string> line;
string search_word;
int linenumber=1;
    while (cin >> search_word)
    {
        for (int x=0; x < line.size(); x++)
        {
            if (line[x] == "\n")
                linenumber++;
            for (int s=0; s < line[x].size(); s++)
            {
                cout << line[x]; //This is outputting the letter instead of what I want which is the word. Once I have that I can do a comparison operator between search_word and this
            }

        }

所以现在line[1] = Hi，line[2] = My name is Joe.

我怎样才能得到它，我可以得到实际的话？

Answer 1

operator>>使用空格作为分隔符，因此它已经逐字读取输入：

#include <iostream>
#include <sstream>
#include <vector>

int main() {
    std::istringstream in("Hi\n\nMy name is Joe\n\nHow are you doing?");

    std::string word;
    std::vector<std::string> words;
    while (in >> word) {
        words.push_back(word);
    }

    for (size_t i = 0; i < words.size(); ++i)
        std::cout << words[i] << ", ";
}

输出：Hi, My, name, is, Joe, How, are, you, doing?,

如果您要在此向量中查找特定关键字，只需以std::string对象形式准备此关键字，您可能会执行以下操作：

std::string keyword;
...
std::vector<std::string>::iterator i;
i = std::find(words.begin(), words.end(), keyword);
if (i != words.end()) {
    // TODO: keyword found
}
else {
    // TODO: keyword not found
}