Question

In my code, I am trying to create a dynamic array with initArray function, and in main I would like to use this initialized array. However, whenever i called the initialized array in main, it is giving me an error.

Here is what i tried:

void main() 
{
    int *a = NULL;
    int n;
    cout<<"Enter size:";
    cin>>n;
    initArray(a,n);
    for(int j=0;j<n;j++)
    {
        cout<<a[j]<<endl;//Crashes here
    }
}
void initArray(int *A, int size)
{
    srand((unsigned)time(0));
    A = new int[size];
    for(int i=0;i<size;i++)
    {
        A[i] = rand()%10;
    }
}

When i do initArray part in main, it works. What am i doing wrong?

Answer 1

I see two problems:

1. the function accepts a pointer. When you write A = ... you’re only changing the copy of the pointer that gets passed to you by value. You could use void initArray(int* &A, int size) instead, or have the function return a pointer.

2. if that’s the full code, you might need a forward declaration of the initArray function.