Programming in Modern C++ | Week 4

Course Name: Programming in Modern C++

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These are Nptel Programming in Modern C++ Assignment 4 Answers

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Quiz

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Q1. Consider the following code segment.
What will be the output/error?
a) 15
b) 20
c) 30
d) Compilation Error : myClass::s is a static data member; it can only be initialized at its definition

Answer: d) Compilation Error : myClass::s is a static data member; it can only be initialized at its definition

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Q2. Consider the following code segment.
What will be the output?
a) 2,5 4,6
b) 6,5 2,11
c) 6,11 2,5
d) 2,5 6,11

Answer: d) 2,5 6,11

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These are Nptel Programming in Modern C++ Assignment 4 Answers

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Q3. Consider the following code segment.
What will be the output/error?
a) 0 1 2
b) 0 2 2
c) 2 0 1
d) Compilation Error: reference to ‘var’ is ambiguous

Answer: a) 0 1 2

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Q4. Consider the following code segment.
Fill in the blank at LINE-1 such that the output will be 4 5.
a) mutable
b) static
c) const
d) friend

Answer: b) static

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These are Nptel Programming in Modern C++ Assignment 4 Answers

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Q5. Consider the following code segment.
Fill in the blank at LINE-1 such that the program will print 15.
a) using e::e1 : : x
b) using e::e1
c) using namespace e::e1
d) using namespace e

Answer: a) using e::e1 : : x

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Q6. Consider the following code segment.
Fill in the blank at LINE-1 such that the output is 10.
a) int mutable
b) mutable int
c) volatile int
d) const int

Answer: a, b

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These are Nptel Programming in Modern C++ Assignment 4 Answers

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Q7. Consider the following code segment.
Fill in the blank at LINE-1 such that the output is 5.
a) name::Student s(5)
b) Students (5)
c) name. Student s(5)
d) using name::Student s(5)

Answer: a) name::Student s(5)

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These are Nptel Programming in Modern C++ Assignment 4 Answers

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Q8. Consider the following code segment.
Fill in the blank at LINE-1 such that the program will print (2,5).
a) Point& operator<<(ostream&, Point&)
b) friend Point& operator<<(ostream&, Point&)
c) Point& friend operator<<(ostream&, Point&)
d) const Point& operator<<(ostream&, Point&)

Answer: b) friend Point& operator<<(ostream&, Point&)

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These are Nptel Programming in Modern C++ Assignment 4 Answers

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Q9. Consider the following code segment.
Fill in the blank at LINE-1 such that the program will print 5 15.
a) static class B
b) friend class B
c) class friend B
d) using class B

Answer: b) friend class B

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These are Nptel Programming in Modern C++ Assignment 4 Answers

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Assignment Questions

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Question 1

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.
The program must satisfy the given test cases.

Solution:

#include<iostream>
using namespace std;
class Database{
    int id;
    static Database *ins;
    Database(int i) : id(i) {}
    public:
        int getIns(){ return id; }
        static Database *createIns(int i){
            if(!ins)
                ins = new Database(i);
            return ins;
        }
        ~Database();
};
Database *Database::ins = 0;
void fun(int i){
    Database *s = Database::createIns(i);

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These are Nptel Programming in Modern C++ Assignment 4 Answers

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Question 2

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.

Solution:

#include<iostream>
using namespace std;

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

    friend class TotalAmount; //LINE-2
};

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These are Nptel Programming in Modern C++ Assignment 4 Answers

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Question 3

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. 

Solution:

#include<iostream>
using namespace std;
class position{
    int x, y;
    public:
        position(int a, int b) : x(a), y(b) {}

        position operator-(const position& p1){

            position p(0,0);

            p.x = x-p1.x;

            p.y = y-p1.y;

            return p;
        }

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These are Nptel Programming in Modern C++ Assignment 4 Answers

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These are Nptel Programming in Modern C++ Assignment 4 Answers

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