NPTEL Programming In Modern C++ Week 12 Programming Assignment


There has been a continual debate on which programming language/s to learn, to use. As the latest TIOBE Programming Community Index for August 2021 indicates – C (13%), Python (12%), C++ (7%), Java (10%), and C#(5%) together control nearly half the programming activities worldwide. Further, C Programming Language Family (C, C++, C#, Objective C etc.) dominate more than 25% of activities. Hence, learning C++ is important as one learns about the entire family, about Object-Oriented Programming and gets a solid foundation to also migrate to Java and Python as needed. C++ is the mother of most general purpose of languages. It is multi-paradigm encompassing procedural, object-oriented, generic, and even functional programming. C++ has primarily been the systems language till C++03 which punches efficiency of the code with the efficacy of OOP. Then, why should I learn it if my primary focus is on applications? This is where the recent updates of C++, namely, C++11 and several later offer excellent depths and flexibility for C++ that no language can match. These extensions attempt to alleviate some of the long-standing shortcomings for C++ including porous resource management, error-prone pointer handling, expression semantics, and better readability. The present course builds up on the knowledge of C programming and basic data structure (array, list, stack, queue etc.) to create a strong familiarity with C++98 / C++03. Besides the constructs, syntax and semantics of C++ (over C), we also focus on various idioms of C++ and attempt to go to depth with every C++ feature justifying and illustrating them with several examples and assignment problems. On the way, we illustrate various OOP concepts. The course also covers important advances in C++ 11 and later released features..

Programming In Modern C++ Week 12 Programming Assignment.

INTENDED AUDIENCE :  Any interested audience
PREREQUISITES :  10th standard/high school
INDUSTRY SUPPORT :  Programming in C++ is so fundamental that all companies dealing with systems as well as application development (including web, IoT, embedded systems) have a need for the same. These include – Microsoft, Samsung, Xerox, Yahoo, Oracle, Google, IBM, TCS, Infosys, Amazon, Flipkart, etc. This course would help industry developers to be up-to-date with the advances in C++ so that they can remain at the state-of-the-art.

Course Layout

Week 1: Programming in C++ is Fun.
Week 2: C++ as Better C.
Week 3: OOP in C++.
Week 4: OOP in C++.
Week 5: Inheritance.
Week 6: Polymorphism.
Week 7: Type Casting.
Week 8: Exceptions and Templates.
Week 9: Streams and STL.
Week 10: Modern C++.
Week 11: Lambda and Concurrency.
Week 12: Move, Rvalue and STL Containers

Programming Assignment Q1

Consider the program below (in C++11).
  • Fill in the blank at LINE-1 and LINE-2 with appropriate definitions of std::promise p1 and std::future f1.
  • Fill in the blank at LINE-3 and LINE-4 with appropriate definitions of std::promise p2 and std::future f2.
  • Fill in the blank at LINE-5 to define a std::thread object by passing appropriate std::future and std::promise objects.
					int main () {

    std::promise<std::vector<int>>p        //LINE-1

    std::future<std::vector<int>>f1=p1.get_future();         //LINE-2

    std::promise<long> p2;                //LINE-3

    std::future<long> f2 = p2.get_future();     //LINE-4

    std::thread th{&product,std::ref(p2),std::ref(f1)};      //LINE-5


Programming Assignment Q2

Consider the following program (in C++14).
  • Fill in the blank at LINE-1 with an appropriate definition of mutex mq_mutex.
  • Fill in the blanks at LINE-2 and LINE-3 with appropriate statements such that all the modification to total_elems happens in a mutual exclusive manner.
					std::mutex mq_mutex;        //LINE-1  
class MessageQueue{
        int total_elems;
        int n;

        MessageQueue() : total_elems(0) {}

        void enqueue(int num_elems){
            std::unique_lock<std::mutex> lck(mq_mutex);                                //LINE-2
            n = num_elems;

            int delay = (int)((double)std::rand() / (double)(RAND_MAX)* 10);


            total_elems += n;

        void dequeue(int num_elems){ 
            std::unique_lock<std::mutex>lck(mq_mutex);      //LINE-3
            n = num_elems;

            int delay = (int)((double)std::rand() / (double)(RAND_MAX)* 10);


            total_elems -= n;
        int getElemsCount(){
            return total_elems;


Programming Assignment Q3

Consider the following program (in C++11).
  • Fill in the blank at LINE-1 with appropriate header to overload function operator.
  • Fill the blank at LINE-2 to invoke the functor NthPrime() asynchronously.
  • Fill the blank at LINE-3 to receive the output from functor NthPrime().
					long long operator()() {     //LINE-1
        long long num = 2;
        for(int i = 0; i < n; num++) {
            if (isPrime(num)) {
        return num-1;

long long findNthPrime(int n){
    auto a= async(NthPrime(n)) ;    //LINE-2
    return a.get() ;                  //LINE-3