Question

我正在尝试将字典文件加载到二叉搜索树中。我想用字母组合加载每个节点，直到它形成一个单词，从而将定义附加到该单词。例如：

C:
Ca:
Cat: a mammal. Closely related to a Liger.

目前，我正在尝试加载示例文件，并且我一直在接收我的inFile.fail（）条件。非常感谢任何帮助，建议和/或代码审查。

以下是我认为可能导致我的问题的两个功能：

bool Dictionary::insertTrie(string word, string def)
{
    Node* newNode = createTrie();
    string tempW;
    bool retVar;
    bool found = searchNode(root, word);

    if(found)
        retVar = false;

    while(!found){
        newNode->word = word;
        newNode->definition = def;
        insert(root, newNode);
        retVar = true;
    }

    /*while(!found){
        for(int i = 0; i < word.length(); i++){ //loop to iterate through the string
            for(int j = 0; j < ALPHABET_SIZE; j++){ //loop to iterate the nodes
                tempW += word[i];
                newNode->word = word;
                newNode->definition = def;
                newNode = newNode->next[j];
            }

            retVar = true;
        }*/

    return retVar;
}


bool Dictionary::loadDictionary(string fileName) 
{
    fstream inFile;
    string file;
    string words;
    string defs;
    string tempW;
    bool retVar;

    inFile.open(fileName, ios::in); // opens
    cout << "\nLoading Dictionary...\n";

    if(inFile.fail()){
        retVar = false;
        cout << "ERROR: Dictionary file failed to load. Please try again.\n";
    }
    else{
        while(!inFile.eof()){ //loop reads in words and definitions until the end of file bit is received
            for(int i = 0; i < words.length(); i++){
                getline(inFile, words, ':');  //receives input of the words stopping at the ':' delimiter
                tempW += words[i];
                getline(inFile, defs, '\n'); //receives input of the defs stopping at the '\n' delimiter
                insertTrie(tempW, defs); //inserts the words and the definition
            }
        }
        retVar = true;
    }

    inFile.close(); //closes the file

    return retVar;
}

Answer 1

     while(!inFile.eof()){

这is always a bug。

            getline(inFile, words, ':');  //receives input of the words stopping at the ':' delimiter

如果输入行不包含分号，则会吞下整行，并开始读取下一行。而下一行。只要找到分号就可以了。这显然是错误的。

您需要在此处进行两项更改。

正确检查文件结尾
使用std::getline()将单行文本读入std::string，读完整行后，检查读取std::string是否包含分号。

此外，您问“我正在尝试加载我一直收到inFile.fail（）条件的示例文件”。如果是这样的话，那么发布数百行完全无关的代码，无论如何，从文件中读取，绝对没有任何目的，并且可能会为你赢得一些赞成票。

读取txt文件c ++

1 个答案: