C++ frequently asked interview questions | Short – Real

(Last Updated On: March 5, 2016)

This section contains list of real C++ short interview questions and answers frequently asked in IT industries for freshers and experienced.


Q-Tell me one important properties of “delete” operator except de-allocation of memory.

Answer – “delete” operator calls the destructor of a class.


Q – Can we overload destructor of a class?

Answer No, we can’t overload the destructor, we don’t have this provision in C++.


Q- In which statement assignment operator will be called?

  1. A Obj1(5);
  2. A Obj2(Obj1);
  3. A Obj2 = Obj1

Answer- None, for every statement copy constructor will get called.

Assignment operator will be called for the following

Obj2 = Obj1; // note this is different than A Obj2= Obj1 as here, we are initializing new object at the time of creation with existing object.


Q- How would you initialize and delete the memory, allocated using “char* p = new char[length]” by 0, where int length =512;

Answer:

All the memory slot of characters can be initialized by 0 using function “memset()”

memset(p,0, length);

Since, this is the array of characters, it should be de-allocated using

delete[] p;


Q-Can we create array of references in C++?

Answer – No, We cannot have array of references.