这是我的dictionary.h文件:
#ifndef DICTIONARY_H
#define DICTIONARY_H
class Dictionary
{
public:
struct Node
{
std::string word;
std::string definition;
static const int ALPHABET_SIZE = 26;
Node* next[ALPHABET_SIZE];
};
typedef Node TrieNode;
typedef TrieNode* Trie;
void createTrie();
bool insertTrie(std::string word, std::string definition);
bool loadDictionary(std::string fileName);
bool lookup(std::string word);
void deleteTrie();
bool writeTrie(std::string fileName);
Dictionary();
~Dictionary();
};
#endif // DICTIONARY_H
以下是我的dictionary.cpp文件:
#include <iostream>
#include <string>
#include <fstream>
#include <cctype>
#include "dictionary.h"
using namespace std;
Dictionary::Dictionary()
{
createTrie();
}
Dictionary::~Dictionary()
{
deleteTrie();
}
void Dictionary::createTrie()
{
static const int ALPHABET_SIZE = 26;
Node *TrieNode = new Node;
TrieNode->word = "";
TrieNode->definition = "";
for (int i = 0; i < ALPHABET_SIZE; i++)
{
TrieNode->next[i] = nullptr;
}
}
bool Dictionary::insertTrie(string word, string definition)
{
static const int ALPHABET_SIZE = 26;
Node *newNode = nullptr;
newNode = new Node;
for (int i = 0; i < word.length(); i++)
{
int letter = (int)word[i] - (int)'a';
newNode->word[letter];
newNode->definition;
for (int i = 0; i < ALPHABET_SIZE; i++)
{
newNode->next[i] = nullptr;
}
}
}
bool Dictionary::loadDictionary(string fileName)
{
string word;
string definition;
fstream dataFile;
dataFile.open(fileName);
cout << "Loading dictionary..." << endl;
if (dataFile)
{
getline(dataFile, word, ':');
getline(dataFile, definition);
insertTrie(word, definition);
while (!dataFile.eof())
{
getline(dataFile, word, ':');
getline(dataFile, definition);
insertTrie(word, definition);
}
dataFile.close();
return 0;
}
else
{
return 1;
}
}
bool Dictionary::lookup(string word)
{
for (int i = 0; i < word.length(); i++)
{
//char letter = (char)word[i] - (char)'a';
Node* tmp = TrieNode->word[i];
}
}
void Dictionary::deleteTrie()
{
;
}
bool Dictionary::writeTrie(string fileName)
{
fstream dataFile;
dataFile.open(fileName, fstream::out);
dataFile.close();
return 0;
}
这是我的main.cpp:
#include <iostream>
#include <string>
#include <fstream>
#include <cctype>
#include "dictionary.h"
using namespace std;
int main()
{
string fileName;
string word;
char answer = 'y';
int loaded;
int written;
int lookedup;
Dictionary dic;
cout << "Please enter the name of the dictionary file: ";
cin >> fileName;
dic.createTrie();
loaded = dic.loadDictionary(fileName);
while (answer == 'y')
{
cout << "Would you like to look up a word? ";
cin >> answer;
if (answer == 'n')
{
cout << "Would you like to write the dictionary to a file? ";
cin >> answer;
if (answer == 'y')
{
cout << "Please enter the filename you wish to save it too: ";
cin >> fileName;
written = dic.writeTrie(fileName);
return 0;
}
}
else if (answer == 'y')
{
cout << "Enter a word: ";
cin >> word;
lookedup = dic.lookup(word);
}
else
cout << "Please select a valid option.";
}
return 0;
}
现在,当我编译它时,出现以下错误:
dictionary.cpp:在成员函数'bool Dictionary :: lookup(std :: __ cxx11 :: string':
dictionary.cpp:83:23:错误:'->'标记之前的预期主表达式
Node * tmp = TrieNode-> word [i];
真正令人烦恼的是,我不知道此错误是否一定是我现在在做错的事情,还是我与指针的不懈努力意味着我已经把这个问题弄得更糟了。
最佳答案
有助于指示行号,但是:Node* tmp = TrieNode->word[i];
TrieNode
是一种类型,因此没有意义。
更不用说在createTrie()
中具有与类型Node *TrieNode = new Node;
相同名称的局部变量了)-命名约定如何帮助避免混淆的完美示例。大多数人会告诉您“ CapitalsForTypes,leaderLowerCaseForVars”(或some_variation_of_that)。
关于c++ - C++ Trie字典-迷失了两天,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/34124282/