When one object reference variable is assigned to another object reference variable then

  1. Home

Question:
When one object reference variable is assigned to another object reference variable then

1.a copy of the object is created.

2.a copy of the reference is created.

3.a copy of the reference is not created.

4.it is illegal to assign one object reference variable to another object reference variable.

Posted Date:-2022-07-04 03:32:08

More MCQS Questions and answers

  1. How can we restrict dynamic allocation of objects of a class using new?
  2. 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; }
  3. Output of following program? #include <iostream> using namespace std; int fun(int=0, int = 0); int main() { cout << fun(5); return 0; } int fun(int x, int y) { return (x+y); }
  4. Predict the output of following C++ program. #include<iostream> using namespace std; class Empty {}; int main() { cout << sizeof(Empty); return 0; }
  5. What happens when delete is used for a NULL pointer? int *ptr = NULL; delete ptr;
  6. What is the use of this pointer?
  7. When a copy constructor may be called?
  8. When a method in a subclass has the same name and type signatures as a method in thesuperclass, then the method in the subclass _____ the method in the superclass.
  9. When the inheritance is private, the private methods in base class are __________ in thederived class (in C++).
  10. Which of the following is not a member of class?
  11. Which of the following is true about constructors? 1) They cannot be virtual. 2) They cannot be private. 3) They are automatically called by new operator.
  12. Which of the following is true about pure virtual functions? 1) Their implementation is not provided in a class where they are declared. 2) If a class has a pure virtual function, then the class becomes abstract class and an instance of this class cannot be created.
  13. Which of the following is true?
  14. Which of the following is true?
  15. Which of the following operators should be preferred to overload as a global function rather than a member method?
  16. Which of the following, in C++, is inherited in a derived class from base class?
  17. Which of the followings is/are automatically added to every class, if we do not write ourown?
  18. Which one of the following is correct, when a class grants friend status to another class?
  19. #include<iostream> using namespace std; class Point { public: Point() { cout << "Constructor called"; } }; int main() { Point t1, *t2; return 0; }
  20. A member function can always access the data in __________, (in C++).
  21. class Test { int x; }; int main() { Test t; cout << t.x; return 0; }
  22. How C++ compiler does differ between overloaded postfix and prefix operators?
  23. How to create a dynamic array of pointers (to integers) of size 10 using new in C++?Hint: We can create a non-dynamic array using int *arr[10]
  24. If a function is friend of a class, which one of the following is wrong?
  25. Implicit return type of a class constructor is:
  26. In C++, const qualifier can be applied to 1) Member functions of a class 2) Function arguments 3) To a class data member which is declared as static 4) Reference variables
  27. It is possible to define a class within a class termed as nested class. There are _____ types of nested classes.
  28. Output of following C++ program? #include<iostream> using namespace std; int main() { int x = 10; int& ref = x; ref = 20; cout << "x = " << x << endl ; x = 30; cout << "ref = " << ref << endl; return 0; }
  29. Output of following program? #include<iostream> using namespace std; class Point { Point() { cout << "Constructor called"; } }; int main() { Point t1; return 0; }
  30. Output of the program? #include<iostream> using namespace std; int fun(int x = 0, int y = 0, int z) { return (x + y + z); } int main() { cout << fun(10); return 0; }
  31. Predict the output? #include <iostream> using namespace std; class Test { int x; Test() { x = 5; } }; int main() { Test *t = new Test; cout << t->x; }
  32. What is the difference between struct and class in C++?
  33. What is the size of wchar_t in C++?
  34. When one object reference variable is assigned to another object reference variable then
  35. Which of the following cannot be passed to a function in C++?
  36. Which of the following functions must use reference?
  37. Which of the following in Object Oriented Programming is supported by Function overloading and default arguments features of C++?
  38. Which of the following is a correct statement?
  39. Which of the following is FALSE about references in C++?
  40. Which of the following is not a correct statement?
  41. Which of the following is not correct (in C++)? 1. Class templates and function templates are instantiated in the same way 2. Class templates differ from function templates in the way they are initiated 3. Class template is initiated by defining an object using the template argument 4. Class templates are generally used for storage classes
  42. Which of the following is not correct for virtual function in C++?
  43. 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.
  44. Which of the following is true about this pointer?
  45. Which of the following is true about virtual functions in C++?
  46. Which of the following operator functions cannot be global?
  47. Which of the following operators are overloaded by default by the compiler in every user defined classes even if user has not written? 1) Comparison Operator (==) 2) Assignment Operator (=)
  48. Which of the following operators cannot be overloaded?
  49. Which operator is having the highest precedence?
Search
R4R Team
R4Rin Top Tutorials are Core Java,Hibernate ,Spring,Sturts.The content on R4R.in website is done by expert team not only with the help of books but along with the strong professional knowledge in all context like coding,designing, marketing,etc!