Void pointer (Supplement), void pointer supplement

Void pointer (Supplement), void pointer supplement

Void * Indicates a null pointer. Null pointers cannot be used directly. For example, the addition and subtraction operations of pointers (because the type is unknown, the offset size cannot be determined ). In some cases, if you do not know the pointer type, use void * instead and convert it to the required pointer type as needed.

For example, the malloc function only applies for a heap memory and returns the first address, but it does not know what pointer the caller will use to receive the address, therefore, a null pointer to the memory address is returned, which is converted by the user.