c++ - 使用大小为 4 的未初始化值

Question

编辑:我当时很蠢，我 - 没有 - 分配它。再次感谢您的帮助!

这是一个我以为自己已经结束的错误，但它又回来了，我不知道为什么会这样。

这是导致错误的 .C 文件中的代码:

int main(int argc, char* argv[])
{
    if( argc > 3 )
    {
        cout << "Too many arguments. Program will close.\n";
        return 1;
    }
     
    else
    {
        int numRooms = 0;
        int start = 0;
        ifstream file;
    
        if( argc == 3 )//Dump wanted
            file.open( argv[ 2 ] , ifstream::in );
        
        else 
            file.open( argv[ 1 ] , ifstream::in );
    

        if( file.is_open() )
        {
            file >> numRooms;
            Graph * maze = new Graph( numRooms );

Graph * maze = new Graph( numRooms ); 是引用错误的地方 (a11.C:41):

==17900== Use of uninitialised value of size 4
==17900==    at 0x8048F05: Graph::Graph(int) (Graph.C:25)
==17900==    by 0x8048C1D: main (a11.C:41)

从这里我们深入研究 Graph.C 文件的第 16 - 30 行:

Graph::Graph( int num )
{
    numRooms = num;
    _index = 0;
    _start = 0;

    easyDelete = new Room*[ num ];
    escapePath = new string[ num ];

    theWALL -> myNumber = -1;
    theWALL -> visited = true;

    safety -> myNumber = 0;
    safety -> visited = false;
}

第 25 行是这样的:theWALL -> myNumber = -1;

“theWALL”和“safety”都是私有(private) *Room 对象:

Private:
    Room * theWALL;
    Room * safety;

“房间”结构如下所示:

struct Room
    {
        bool visited;
        int myNumber;

        Room *North;
        Room *East;
        Room *South;
        Room *West;
    };

---

当我调用 new Graph( numRooms ) 时它被初始化，我正在填充它的信息......但我得到这个错误。

Answer 1

看起来你没有分配

Room * theWALL;

在使用之前

theWALL -> myNumber = -1;

尝试类似的东西

theWall = new Room();
theWALL -> myNumber = -1;

你有同样的错误:

 Room * safety;

也尝试分配它。