When are the pointer types known for upcasting the objects?

Related MCQs

• Which of the following is true about templates? 1) Template is a feature of C++ that allows us to write one code for different data types. 2) We can write one function that can be used for all data types including user defined types. Like sort(), max(), min(), ..etc. 3) We can write one class or struct that can be used for all data types including user defined types. Like Linked List, Stack, Queue,..etc. 4) Template is an example of compile time polymorphism.
• Which property is shown most when upcasting is used?
• If multiple inheritance is implemented, which upcasting will be correct?
• Which of the following is true about new when compared with malloc: 1) new is an operator, malloc is a function 2) new calls constructor, malloc doesn’t 3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.
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• Which of the following is true about this pointer?
• What is the use of this pointer?
• Is it fine to call delete twice for a pointer? #include<iostream> using namespace std; int main() { int *ptr = new int; delete ptr; delete ptr; return 0; }
• What happens when delete is used for a NULL pointer? int *ptr = NULL; delete ptr;
• Which of the followings is/are pointer-to-member declarator?