array in structure help

**bobnet** · 10-24-2003

I have a structure with an array, but the array size I know only after my program has done something else which would then set the varSize variable. But how do I do this if the array is in a structure??

Code:

struct database
{
  int anArray[varSize]
};

how do I "pass" in varSize so when I make an instance of the structure it creates an array with "varSize" number of elements? I don't wnat to use global variables to keep in practise of good programming

**joshdick** · 10-24-2003

You'll need to use the new operator to allocate memory at runtime. Otherwise, your array size must be a constant known at compile time.

**bennyandthejets** · 10-25-2003

To expand on joshdick's statement, here's some code:

Code:

struct database
{
   int *anArray;
};

.
.
.

int main()
{
      int size;

      cin >> size;

      database db;
      db.anArray=new int[size];

      //Use the array however you want

     delete [] db.anArray;
     return 0;
}

**bobnet** · 10-25-2003

Thanks joshdick and bennyandthejets

I guess new allocattes memory on the heap and delete frees up resources after

**joshdick** · 10-25-2003

Originally posted by bobnet
Thanks joshdick and bennyandthejets

I guess new allocattes memory on the heap and delete frees up resources after

The Force is strong with this one.

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