如何将数组大小传递给C ++中的函数

Question

just I want to ask how can I pass array size to throw function to set size of my game recoreds the only reason I am not using vector because I will base this recored to PMI lib and it doesn't support C++ Constrainers because it written in C that's why I use array

void playGame(int max_streak_length)
{
    int tracker =0 ;
    const int arrsize  = max_streak_length;

    int gameRecored[arrsize]={0};


    while( tracker < 4)
    {

        Craps games;

        if( games.Play()== true)
        {
            tracker++;
        }
        else
            if(tracker >0)
        {
            gameRecored[tracker-1]++;
            tracker = 0;
        }

    }
    gameRecored[tracker-1]++;
    int v= 0;


}

Answer 1

C++ does not support the variable length array feature available in C.99. However, C++ offers std::vector<> which is as easy to use, and some may say safer.

    std::vector<int> gameRecored(arrsize, 0);

You can use gameRecored as an array like you do in your current code, and it will clean itself up when the function call returns.

Answer 2

you can't not define an array whose size is a VARIABLE. If you want a dynamic size, you should use operator new, just like this:

int mysize = 10;
int* array = new int[mysize];

the variable mysize can be a dynamic number, such as function parameter. If your array will never change its size, you can use :

int array[10];

remember, if you use operator new, you must use operator delete to delete your array when you don't need it.

Hop can help you.