How to dynamically increase the array size?
c++
Solution
You can't change the size of the array, but you don't need to. You can just allocate a new array that's larger, copy the values you want to keep, delete the original array, and change the member variable to point to the new array.
Allocate a new[] array and store it in a temporary pointer.
Copy over the previous values that you want to keep.
Delete[] the old array.
Change the member variables, `ptr` and `size` to point to the new array and hold the new size.
Problem
I've been trying to make a program that adds 2 arrays of different size. But I would like to know to to dynamically increase the array size capacity? Ex: array[4] then upgrade the size to 2 to make array[6];? EDIT: WIthout using vectors I tried creating a new ptr but it does not work. I get the error: Read only variable is not assignable. ``` int *ptr2 = new int[a2.size]; // new ptr2 copies ptr1 for (int i=0; i<(a1.size); i++) { ptr2[i] = a1.ptr[i]; } // we want ptr1 to point to ptr2 for (int i=0; i<(a2.size); i++) { ptr2[i] += a2.ptr[i]; } delete [] a1.ptr; a1.ptr=ptr2; ```