Object Oriented Programming interview questions part 37
Object Oriented Programming interview questions part 37
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Total Questions: 20
1. In how many ways can an object be passed to a function?
Correct Answer is : 3
2. If an object is passed by value, ____________________
Correct Answer is : A new copy of object is created implicitly
3. Pass by address passes the address of object _________ and pass by reference passes the address of the object _________
Correct Answer is : Explicitly, Implicitly
4. If an object is passed by reference, the changes made in the function ___________
Correct Answer is : Are reflected to the main object of caller function too
5. Constructor function is not called when an object is passed to a function, will its destructor be called when its copy is destroyed?
Correct Answer is : Yes, must be called
6. When an object is returned by a function, a _______________ is automatically created to hold the return value.
Correct Answer is : Temporary object
7. Is the destruction of temporary object safe (while returning object)?
Correct Answer is : No, unexpected side effects may occur
8. How to overcome the problem arising due to destruction of temporary object?
Correct Answer is : Overloading assignment operator and defining copy constructor
9. How many objects can be returned at once?
Correct Answer is : Only 1
10. What will be the output of the following code? Class A { int i; public : A(int n) { i=n; cout<<”inside constructor ”; } ~A() { cout<<”destroying ”<<i; } void seti(int n) { i=n; } int geti() { return I; } }; void t(A ob) { cout<<”something ”; } int main() { A a(1); t(a); cout<<”this is i in main ”; cout<<a.geti(); }
Correct Answer is : inside constructor something destroying 2this is i in main destroying 1
11. It is necessary to return the object if it was passed by reference to a function.
Correct Answer is : No, the changes are made automatically
12. How many objects can be passed to a function simultaneously?
Correct Answer is : As many as required
13. If an object is passed by address, will be constructor be called?
Correct Answer is : No, values are copied
14. Is it possible that an object of is passed to a function, and the function also have an object of same name?
Correct Answer is : No, Duplicate declaration is not allowed
15. Passing an object using copy constructor and pass by value are same.
Correct Answer is : FALSE
16. Passing object to a function _______________
Correct Answer is : Can be done in more than one ways
17. The object ________________
Correct Answer is : Can be passed by reference or value
18. Which symbol should be used to pass the object by reference in C++?
Correct Answer is : &
19. If object is passed by value, ________________
Correct Answer is : Copy constructor is used to copy the values into another object in the function
20. Pass by reference of an object to a function _______________
Correct Answer is : Affects the object in caller function
