how to pass array size to function in C++

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;


}

make a dynamic array, or use a vector? use a template function? — phoad
– phoad, Commented Sep 30, 2013 at 2:40

jxh · Accepted Answer · 2013-09-30 02:45:10Z

2

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.

answered Sep 30, 2013 at 2:45

jxh

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Comments

Claude_Zhao · Accepted Answer · 2013-09-30 02:46:09Z

0

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.

answered Sep 30, 2013 at 2:46

Claude_Zhao

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2 Comments

user474901 Over a year ago

how can i fill them all 0

Jim Garrison Over a year ago

As @paddy said before me, using std::vector would be even better than making a dynamic array with new.

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