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23 C++ Template Questions And Answers

1⟩ What is Class element in C++?

A class is a user defined data type. It serves as a template of the objects. You can define structure and behavior of an object using class. It includes data and the member functions that operate on data.

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3⟩ What is Cass template?

The individual construction of a class is specified by a class template which is almost similar the way how individual objects are constructed by using a class. It is referred to a jargon for plain classes.

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5⟩ Tell us what is the STL, standard template library?

The Standard Template Library, or STL, is a C++ library of container classes, algorithms, and iterators; it provides many of the basic algorithms and data structures

The STL includes the classes vector, list, deque, set, multiset, map, multimap, hash_set, hash_multiset, hash_map, and hash_multimap.

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6⟩ Tell me what are the syntax and semantics for a function template?

Templates is one of the features of C++. Using templates, C++ provides a support for generic programming.

We can define a template for a function that can help us create multiple versions for different data types.

A function template is similar to a class template and it syntax is as follows:

template <class T>

Return-type functionName (arguments of type T)

{

//Body of function with type T wherever appropriate

}

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7⟩ Can you please explain what are the characteristics of Object Oriented programming language?

Some key features of the Object Oriented programming are:

Emphasis on data rather than procedure

Programs are divided into entities known as objects

Data Structures are designed such that they characterize objects

Functions that operate on data of an object are tied together in data structures

Data is hidden and cannot be accessed by external functions

Objects communicate with each other through functions

New data and functions can be easily added whenever necessary

Follows bottom up design in program design

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9⟩ What is Encapsulation in C++?

The wrapping up of data and member function into an object is called encapsulation. The data is not accessible to the outside world and only those functions which are wrapped into the object can access it. An encapsulated objects act as a "black box" for other parts of the program which interact with it. They provide a service, but the calling objects do not need to know the details how the service is accomplished.

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10⟩ What is Template class?

A class that has generic definition or a class with parameters which is not instantiated until the information is provided by the client. It is referred to a jargon for plain templates.

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11⟩ What is Polymorphism in C++?

Polymorphism enables one common interface for many implementations, and for objects to act differently under different circumstances. You can also achieve polymorphism in C++ by function overloading, operator overloading and implementation inheritance.

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12⟩ What is Inheritance in C++?

Inheritance enables a new class to reuse the state and behavior of old class. The new class inherits properties and methods from the old class and is called as derived class and the old class is called as base class. The methods thus inherited can be extended using overriding facility of C++.

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16⟩ What is the output of this program? #include <iostream> using namespace std; template <class T, int N> class mysequence { T memblock [N]; public void setmember (int x, T value); T getmember (int x); }; template <class T, int N> void mysequence<T,N> setmember (int x, T value) { memblock[x] = value; } template <class T, int N> T mysequence<T,N> getmember (int x) { return memblock[x]; } int main () { mysequence <int, 5> myints; mysequence <double, 5> myfloats; myints.setmember (0, 100); myfloats.setmember (3, 3.1416); cout << myints.getmember(0) << 'n'; cout << myfloats.getmember(3) << 'n'; return 0; } a) 100 b) 3.1416 c) 100 3.1416 d) none of the mentioned

c) 100

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19⟩ Can you please explain the difference between a template class and class template?

Template class: A class that has generic definition or a class with parameters which is not instantiated until the information is provided by the client. It is referred to a jargon for plain templates.

Cass template: The individual construction of a class is specified by a class template which is almost similar the way how individual objects are constructed by using a class. It is referred to a jargon for plain classes.

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