C++ Interview Question and Answers

41. What is a container class? What are the types of container classes?
 
  • A container class is a class that is used to hold objects in memory or external storage.
  • A container class acts as a generic holder.
  • A container class has a predefined behavior and a wellknown interface.
  • A container class is a supporting class whose purpose is to hide the topology used for maintaining the list of objects in memory.
  • When a container class contains a group of mixed objects, the container is called a heterogeneous container; when the container is holding a group of objects that are all the same, the container is called a homogeneous container.
 
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42. What is Associative container?
 
    Associative containers are designed to support direct access to elements using keys. They are not sequential. There are four types of associatives containers :
  • Set
  • Multiset
  • Map
  • Multimap
 
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43. What is an iterator?
  Iterators are like pointers. They are used to access the elements of containers thus providing a link between algorithms and containers. Iterators are defined for specific containers and used as arguments to algorithms.
 
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44. What are the defining traits of an object-oriented language?
 
    The defining traits of an object-oriented langauge are :
  • Encapsulation
  • Inheritance
  • Polymorphism
 
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45. What is this pointer?
  It is a pointer that points to the current object. This can be used to access the members of the current object with the help of the arrow operator.
 
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