size of dynamically allocated array

Question

Is it true that a pointer assigned to the starting address of a dynamically allocated array does not have the information of the size of the array? So we have to use another

Answer 1

Yes, it's true. This is part of why you should rarely try to deal with this directly, and use a standard container instead. About the only time it makes sense to deal with it is if you decide to implement a container yourself (in which case you'll normally track the size information in your container's implementation).