C++ 检查文本文件c ++中是否存在单词
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/13482464/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Checking if word exists in a text file c++
提问by Glen654
I need to check if a word exists in a dictionary text file, I think I could use strcmp, but I don't actually know how to get a line of text from the document. Here's my current code I'm stuck on.
我需要检查字典文本文件中是否存在一个单词，我想我可以使用 strcmp，但我实际上不知道如何从文档中获取一行文本。这是我目前坚持使用的代码。
#include "includes.h"
#include <string>
#include <fstream>
using namespace std;
bool CheckWord(char* str)
{
ifstream file("dictionary.txt");
while (getline(file,s)) {
if (false /* missing code */) {
return true;
}
}
return false;
}
采纳答案by Sidharth Mudgal
char aWord[50];
while (file.good()) {
file>>aWord;
if (file.good() && strcmp(aWord, wordToFind) == 0) {
//found word
}
}
You need to read words with the input operator.
您需要使用输入运算符读取单词。
回答by Software_Designer
std::string::finddoes the job.
std::string::find做这项工作。
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
bool CheckWord(char* filename, char* search)
{
int offset;
string line;
ifstream Myfile;
Myfile.open (filename);
if(Myfile.is_open())
{
while(!Myfile.eof())
{
getline(Myfile,line);
if ((offset = line.find(search, 0)) != string::npos)
{
cout << "found '" << search << " \n\n"<< line <<endl;
return true;
}
else
{
cout << "Not found \n\n";
}
}
Myfile.close();
}
else
cout<<"Unable to open this file."<<endl;
return false;
}
int main ()
{
CheckWord("dictionary.txt", "need");
return 0;
}
