Programming in Modern C++ | Week 3

Course Name: Programming in Modern C++

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These are Nptel Programming in Modern C++ Assignment 3 Answers

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Quiz

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Q1. Consider the following program.
Which line/s will generate an error?
a) LINE-1
b) LINE-2
c) LINE-3
d) LINE-4

Answer: a) LINE-1

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Q2. Consider the following class.
Fill in the blanks with proper access specifiers so that member y can be accessed from outside of the class but member x cannot be accessed.
a) public, public
b) public, private
c) private, public
d) private, private

Answer: c) private, public

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These are Nptel Programming in Modern C++ Assignment 3 Answers

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Q3. Consider the following code segment.
What will be the output/error?
a) 1st
b) 2nd
c) 1st 2nd
d) Compilation Error : call of overloaded ‘myClass()’ is ambiguous

Answer: d) Compilation Error : call of overloaded ‘myClass()’ is ambiguous

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Q4. Consider the following code segment.
What will be the output?
a) 1 2
b) 3 1
c) 2 3
d) 3 4

Answer: c) 2 3

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These are Nptel Programming in Modern C++ Assignment 3 Answers

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Q5. Consider the following code segment.
Fill in the blank at LINE-1 so that the program will print fun is coding.
a) *lstr, *mstr, *fstr
b) *mstr, *fstr, *lstr
c) *lstr, *fstr, *mstr
d) *fstr, *lstr, *mstr

Answer: a) *lstr, *mstr, *fstr

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Q6. Consider the following code segment.
What will be the output?
a) 27
b) 00
c) Compilation error : no default constructor
d) Compilation error : constructor is private

Answer: d) Compilation error : constructor is private

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These are Nptel Programming in Modern C++ Assignment 3 Answers

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Q7. Consider the following code segment.
What will be the output/error?
a) 10 20
b) 20 50
c) Compilation Error : 1value required as left operand of assignment
d) Compilation Error : private data members are inaccessible

Answer: c) Compilation Error : 1value required as left operand of assignment

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These are Nptel Programming in Modern C++ Assignment 3 Answers

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Q8. Consider the following code segment.
What will be the output/error?
a) 1st
b) 2nd
c) 1st 2nd
d) Compilation error: conversion from ‘int’ to ‘Test’ is ambiguous

Answer: d) Compilation error: conversion from ‘int’ to ‘Test’ is ambiguous

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These are Nptel Programming in Modern C++ Assignment 3 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
a) int
b) const int
c) mutable int
d) int mutable

Answer: c, d

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These are Nptel Programming in Modern C++ Assignment 3 Answers

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Assignment Questions

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Question 1

Consider the program below. Fill in the blanks at LINE-1, LINE-2, and LINE-3 with appropriate keywords such that the program must satisfy the given test cases.

Solution:

#include<iostream>
using namespace std;
class Employee{
    const int id;
    string name;
    mutable  int salary; //LINE-1
    public:
        Employee(int a, string b, int c) : id(a), name(b), salary(c) {}
        void updateSalary(int x) const { salary += x; } //LINE-2
        void print() const{    //LINE-3

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These are Nptel Programming in Modern C++ Assignment 3 Answers

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Question 2

Consider the following program.
  • Fill in the blank at LINE-1 with the appropriate initializer statement for the parameterized constructor,
  • Fill in the blank at LINE-2 with the appropriate statement which deletes the dynamically allocated memory to data member arr
The program must satisfy the sample input and output.

Solution:

#include<iostream>
using namespace std;
class Array{
    char *arr;
    int size;
    public:
        Array(int n) : size(n), arr(new char[n]){} //LINE-1
        ~Array(){ delete [] arr; } //LINE-2

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These are Nptel Programming in Modern C++ Assignment 3 Answers

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Question 3

Consider the program below.
  • Fill in the blank at LINE-1 to complete parameterized constructor
  • Fill in the blank at LINE-2 to complete copy constructor
  • Fill in the blank at LINE-3 to complete return statement
The area( ) evaluates the area of the given right-angled triangle.
The program must satisfy the given test cases. 

Solution:

#include <iostream>
using namespace std;
class triangle {
    const int *_base, *_height;
public:
    triangle(int b, int h) : _base(new int(b)), _height(new int(h)) { } // Line-1
    // LINE-1: Complete Constructor definition
    ~triangle() {
       delete _base,_height; // Line-2
        // LINE-2: Complete destructor to delete both data pointers
    }
    double area();
};
double triangle::area() {  // LINE-3: Complete function header
    return 0.5 * *_base * *_height;
}

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These are Nptel Programming in Modern C++ Assignment 3 Answers

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These are Nptel Programming in Modern C++ Assignment 3 Answers

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