NPTEL Programming In Modern C++ Week 4 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 4 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 which defines a class Database. Complete the program with the
following instructions.
• Fill in the blank at LINE-1 to complete the declaration of member variable ins.
• Fill in the blank at LINE-2 to specify the return type of createIns() function.
• Fill in the blank at LINE-3 to call the createIns() function with parameter i.
using namespace std;
class Database{
    int id;
    static Database *ins;                   //LINE-1
    Database(int i) : id(i) {}
        int getIns(){ return id; }
        static Database *createIns(int i){      //LINE-2
                ins = new Database(i);
            return ins;
Database *Database::ins = 0;                
void fun(int i){
    Database *s = Database::createIns(i);   //LINE-3
    cout << s->getIns();

Database::~Database(){ cout << id; }

int main(){
    int a,b;
    cin >> a >> b;
    Database *s = Database::createIns(a);
    cout << s->getIns();
    return 0;

Programming Assignment Q2

Consider the following program.
• Fill in the blanks at LINE-1 to complete forward declaration.
• Fill in the blank at LINE-2 with appropriate function declaration so that function calculate can access private data member of TotalAmount class.
The program must satisfy the sample input and output.
using namespace std;

class Interest; //LINE-1
class TotalAmount{
    double prinAmt;
    double amt = 0;
    TotalAmount(double p) : prinAmt(p){}
    double calculate(Interest&);
class Interest{
    double in;
    Interest(double i) : in(i){ }

    friend class TotalAmount; //LINE-2

double TotalAmount::calculate(Interest &i){
    amt = prinAmt * (1 + / 100);
    return amt;
int main(){
    double i, j;
    cin >> i >> j;
    TotalAmount m(i);
    Interest in(j);
    cout << "Matured Amount: " << m.calculate(in);
    return 0;

Programming Assignment Q3

Consider the following program. Fill in the blanks as per the instructions given below:
• at LINE-1 to complete operator overload function,
• at LINE-2 and LINE-3 to calculate subtraction of two position class.
such that it will satisfy the given test cases. 
using namespace std;
class position{
    int x, y;
        position(int a, int b) : x(a), y(b) {}

        position operator-(const position& p1){ //LINE-1

            position p(0,0);

            p.x = x-p1.x; //LINE-2

            p.y = y-p1.y; //LINE-3

            return p;
        void print(){ cout << "(" << x << ", " << y << ")"; }

int main(){
    int x1,y1,x2,y2;
    cin >> x1 >> y1 >> x2 >> y2;
    position p1(x1,y1), p2(x2,y2), p3(0,0);
    p3 = p1-p2;
    return 0;