這是使用遞歸解決Boggle棋盤遊戲的代碼。找到字典中的所有單詞後,當我檢查向量的大小時,我已經添加了單詞,找到了正確的單詞數量,但之後當我訪問函數外部的矢量時,我得到矢量的大小爲零。我使用「&」發送了向量的地址,但它似乎即使在該函數之外,矢量也沒有被更新。矢量不更新外部函數C++
這裏是我的函數wordCheck的代碼,我發送一個拼圖的副本,一行和一列以及一個名爲finalWord的空字符串。正如你所看到的,隨着單詞的添加,我會跟蹤矢量的大小,但是一旦函數經歷了可以用第一個字母形成的所有可能的單詞,即在r,c處的字母,矢量大小是正確的但是一旦我嘗試像在computerPlay()中一樣訪問它之外的循環,大小就會回到0,因此最後不會打印任何內容。在這個例子中,我只是測試第一個位置(0,0)。我也複製了computerPlay()的代碼。
void Boggle::computerPlay(){
//copy of boggle board
char boggleCopy[SET_ROWS][SET_COLUMNS];
vector<string> computerWords;
for (int i = 0; i < SET_ROWS; i++) {
for (int j = 0; j < SET_COLUMNS; j++) {
boggleCopy[i][j] = theBoard[i][j];
}
}
string finalWord;
wordCheck(boggleCopy, 0, 0, finalWord, computerWords);
// here the vector size printed is Zero when in fact it should be 7 like it is inside the loop
cout << "Vector size is " << computerWords.size() << endl;
for (vector<string>::iterator i = computerWords.begin(); i != computerWords.end(); i++){
cout << *i << endl;
}
}
void Boggle::wordCheck(char puzzle[SET_ROWS][SET_COLUMNS], int r, int c, string finalWord, vector<string>& v){
char letter = puzzle[r][c];
finalWord = finalWord + letter;
puzzle[r][c] = ' ';
if (finalWord.length() > 2){
if(dictionary.binarySearch(finalWord)){
v.push_back(finalWord);
cout << v.size() << " is the size" << endl;
}
}
for(int dr = -1 ; dr <= 1 ; dr++){
for(int dc = -1 ; dc <= 1 ; dc++){
if (dr != 0 || dc != 0){
if(finalWord.length() <= maxLength){
if (!outOfBounds(r + dr, c + dc) && !(puzzle [r + dr][c + dc] == ' ')){
if (finalWord.length() == 3){
if(!(dictionary.isPrefix(finalWord))){
break;
}
}
wordCheck(puzzle, r + dr, c + dc, finalWord, computerWords);
}
}
}
}
}
puzzle[r][c] = finalWord.at(finalWord.length() - 1);
int size = v.size();
cout << "Last vector size is " << size << endl;
// here my code prints out 7 as the size of the vector, which is the correct size that the vector should be.
cout << "Last vector size is " << computerWords.size() << endl;
}
你有computerWords作爲這個類的屬性? – ibrohimislam