逻辑错误，通过引用传递的数量明显更高

下面我粘贴了一些我写的代码。我遇到的问题是，当 turnmessage 将一个数字传递给 found（）（通过引用）时，它会以某种方式增加。例如，如果传入 3，我会收到 300 万。

（以下在文件Projectmain.cpp）

#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include "project1.h"
using namespace std;
project1 game;
string str(int number){
    stringstream ss;
    ss << number;
    string result = ss.str();
    return result;
}
void project1::setNames(){
    string name;
    cout<< "Player one, enter your name: ";
    cin >> name;
    playerOneName = name;
    cout<< "Player two, enter your name: ";
    cin >> name;
}
void project1::resetBoard(){
    for(int i = 0; i < 3; i++){
    RowOne[i] = str(i + 1);
    RowTwo[i] = str(i + 4);
    RowThree[i] = str(i + 7);
    }
    int used[] = {-1, -1, -1, -1, -1, -1, -1, -1, -1};
    turn = 1;
}
void project1::printBoard(){
    for(int i = 0; i < 3; i++){
        cout << " | " << RowOne[i] << " | ";
    }
    cout << endl;
    for(int i = 0; i < 3; i++){
        cout << " | " << RowTwo[i] << " | ";
    }
    cout << endl;
    for(int i = 0; i < 3; i++){
        cout << " | " << RowThree[i] << " | ";
    }
    cout << endl;
}
string project1::PlayerOneName(){
    return playerOneName;
}
string project1::PlayerTwoName(){
    return playerTwoName;
}
bool project1::found(int& number){
    cout << " your number after pass: " << number;
    int i = 0;
    bool found = false;
    while(i < 9 && found == false){
        cout << used[i];
    if(used[i] == number)
        found = true;
    i++;
    }
    return found;
}
void project1::turnmessage(){
    int number = -1;
    bool found;
    do{
    if(turn == 1)
        cout << PlayerOneName();
        else
        cout <<PlayerTwoName();
    cout << " it's your turn!" << endl << "Enter the number you wish to use: ";
    cin >> number;
    number--;
    bool found = game.found(number);
    if (found == true)
        cout << "Sorry, that has already been used. Please try again.";
    }while(found == true);
}

int main(){
    game.setNames();
    game.resetBoard();
    game.printBoard();
    game.turnmessage();
return 0;   
}

（以下在文件项目1.h中）

#include<string>
#include<iostream>

using namespace std;
class project1{
public:
    void setNames();
    void resetBoard();
    void printBoard();
    void turnmessage();
    string PlayerOneName();
    string PlayerTwoName();
    bool found(int&);
private:
    int playerOneScore;
    int playerTwoScore;
    string playerOneName;
    string playerTwoName;
    string RowOne[3];
    string RowTwo[3];
    string RowThree[3];
    int used[9];
    int turn;
};