Question

所以这里是我试图用指针调用数组的主要部分：

#include <iostream>
#include "Lottery.h"
#include "Player.h"
#include "LotteryData.h"
using namespace std;

int main()
{
    Player player;
    Lottery random;
    LotteryData data;
    player.Input();
    random.setRandomNumber();
    data.PassInfo(int (&Numbers)[6][6]);   

}

显然“数字”是未定义的，即使包含标题，这里是与之相关的标题和.cpp文件。

LotteryData.h

#pragma once
#include <iostream>
#include <fstream>
#include "Lottery.h"
#include "Player.h"
using namespace std;

class LotteryData
{
    private:

    public:
    LotteryData();
    ~LotteryData();
    void PassInfo(int (&Numbers)[6][6]);
};

LotteryData.cpp

#include <iostream>
#include <fstream>
#include "LotteryData.h"
using namespace std;

LotteryData::LotteryData()
{
}

LotteryData::~LotteryData()
{
}

void LotteryData::PassInfo(int (&Numbers)[6][6])
{
    int* ptr;
    FILE *Numfile;
    Numfile = fopen("C:/Num.txt", "wb");
    ptr = &Numbers[6][6];
    for (int i=0; i<36; i++)
    {
        fwrite(ptr, sizeof(int), 36*36, Numfile);
    }
    fclose(Numfile);
    //ofstream out("Numbers.txt");

}

一切似乎都很好，我很困惑为什么主要的参考说数组是未定义的，任何想法？

编辑：道歉，错过了一些位

Player.h

#pragma once
#include <iostream>
#include <fstream>
using namespace std;

class Player
{
    private:

    public:
    Player();
    ~Player();
    void Input(); 
    int Numbers[6][6];
};

Player.cpp

#include <iostream>
#include <fstream>
#include "Player.h"
using namespace std;

Player::Player()
{

}

Player::~Player()
{

}

void Player::Input()
{
    int num(0);
    int duplicate = 0;
    int game = 0;
    int NumberofGames = 0;

    cout<<"How many games do you want to play for this weeks draw?"<<endl;
    cin>>NumberofGames;
    if (NumberofGames>6)
    {
        cout<<"Please enter an amount between 1 and 6"<<endl;
        cin>>NumberofGames;
    }

    do
    {

        for (int i=0;i<6;i++)
        {
            cout<<"Enter Number "<< (i+1) <<endl;
            cin>>num;

            if (num > 0 && num <67)
            {
                Numbers[game][i]= num;
            }
            else
            {
                cout <<"Please enter number between 1 and 66"<<endl;
                i = i-1;
            }

        }
        game = game + 1;
        NumberofGames = NumberofGames - 1;

    }
    while (NumberofGames=0);
}

Answer 1

void PassInfo(int (&Numbers)[6][6]);

该行未声明数组 - 它声明了一个函数。你的类中没有数组声明（实际上，你的类中没有声明数据成员）。

如果要声明成员数组，则需要修改类定义：

class LotteryData
{
private:
        int Numbers[6][6]; // this declares an array
public:
    LotteryData();
    ~LotteryData();
    void PassInfo(int (&arr)[6][6]); // this is still a function declaration
};

Answer 2

仅仅因为你将函数的参数命名为Numbers并不奇怪地意味着你的程序中有一个名为Numbers的数组。

Answer 3

在main（）函数中，

data.PassInfo(int (&Numbers)[6][6]);

这是错误的。您应该简单地将引用传递给2D数组。

int (&Numbers)[6][6];
data.PassInfo(Numbers);

Answer 4

所以Player有一个名为“Numbers”的数组。

然后你会像这样使用它：

data.PassInfo(player.Numbers);

当包含类头时，为什么我的数组在main中未定义？

4 个答案: