How does the state of an element change when it is moved to memory via reallocation?

During reallocation operations (for example, using the realloc function in C), the size of a memory block is changed. If the current block cannot be expanded in place, a new block is allocated elsewhere in memory, and data from the old block is copied to the new one.

The state of the element changes as follows:

• The address of the element may change, as memory is moved.
• The content of the element is preserved if copying was successful.
• Pointers to the old address become invalid and need to be updated.

Therefore, after reallocation, it is important to use the return value of the function to work with the new memory address, otherwise, access errors may occur.