Programming in Modern C++ Week 2 Assignment Answers
Are you looking for the NPTEL Programming in Modern C++ Assignment 2 Answers 2025? You’ve come to the right place! This resource provides comprehensive solutions to all the questions from the Week 2 assignment, helping you navigate through the complexities of modern C++ programming.
Table of Contents
Programming in Modern C++ Week 2 Assignment Answers (Jan-Apr 2026)
Que1.
Assume that letter_ → [A-Za-z_] and digit → [0-9]. What is the correct regular expression to define a valid identifier in C programming language?
a) letter_(letter_| digit)*
b) (letter| digit)*
c) letter_(letter| digit)*
d) letter(letter | digit)*
Que2.
Consider the alphabet Σ = {a, b}. Which of the following is a correct regular expression that represents even number of a?
a) (babab*)* + (bb*)
b) (aba) + (bb*)
c) (babab*)*
d) (ababa*)* + (bb*)
Que3.
What is the regular expression over Σ = {a, b} for the language that includes the strings containing ab as substring?
a) (a+b)ab(a+b)
b) (a+b)ab(a+b)
c) (ab)ab(ab)
d) ab(a+b)*
Que4.
Consider the following Deterministic Finite Automata (DFA). It represents:
a) A DFA that accepts all the strings that end with ba
b) A DFA that accepts all the strings that end with a
c) A DFA that accepts all the strings that end with b
d) An NFA that accepts all the strings that end with ab
Que5.
Which of the following statements about ε-moves (epsilon transitions) in finite automata is correct?
a) An ε-move consumes one input symbol
b) ε-moves are allowed only in DFA
c) ε-moves allow the automaton to change states without consuming any input symbol
d) An automaton with ε-moves always accepts all strings
Que6.
Assume that the token set is {+, −, *, ++, –, **, >, <=, >=}. How many tokens can be generated for the input>=>++><=">>--?
a) 10
b) 11
c) 12
d) 14
Que7.
What is the regular expression accepted by the following DFA?
a) 0(10)*
b) (01)*0
c) Both (A) and (B)
d) Neither (A) nor (B)
Que8.
Consider the grammar G with productions
S → aSb and S → ab, where S is the non-terminal and a and b are terminal symbols.
G represents which language?
a) L(G) = {aⁿbⁿ : n ≥ 1}
b) L(G) = {aᵐbⁿ : m, n ≥ 1}
c) L(G) = {aⁿ : n ≥ 1}
d) L(G) = {aᵐbⁿ : n ≥ 1, m < n}
Que9.
Consider the following C program segment:
void main()
{
int 1x, y;
x = 10;
y = 5;
if x > y
y = y + x;
}
This program suffers from:
a) One syntax error
b) One lexical error
c) Both (A) and (B)
d) Neither (A) nor (B)
Que10.
How many states will the DFA equivalent to an NFA with n states have in the worst case?
a) n
b) 2n
c) 2ⁿ
d) n²
(July-Dec 2025)
Question 1. Consider the following program.
#include <iostream>
using namespace std;
int main(){
const int n = 20; // LINE-1
n = 30; // LINE-2
cout << n;
return 0;
}
What will be the output/error?
a) 20
b) 30
c) Compilation Error at LINE-1: const must be initialized
d) Compilation Error at LINE-2: assignment of read-only variable ’n’
Question 2. Consider the following program.
#include <iostream>
using namespace std;
int main(){
int n = 10;
int * const p = &n;
int m = 20;
p = &m; // LINE-1
cout << *p;
return 0;
}
What will be the output/error?
a) 10
b) 20
c) Compilation Error at LINE-1: assignment of read-only variable ’p’
d) Segmentation fault
Question 3. Consider the following code segment and find the output.
#include <iostream>
#define SQUARE(x) (x + x)
using namespace std;
int main(){
int a = 4;
int b = SQUARE(a + 1);
cout << b;
return 0;
}
What will be the output/error?
a) 10
b) 5
c) 13
d) 20
Question 4. Consider the following code segment.
#include <iostream>
using namespace std;
int main(){
____ int z = x + y; // LINE-1
cout << z;
return 0;
}
Fill in the blank at LINE-1 such that the code compiles.
a) const
b) static
c) inline
d) register
Question 5. Consider the following code segment.
#include <iostream>
using namespace std;
void modify(int x1, _______, _______){ //Line-1
x2 = x1 * 2;
*x3 = x1 + 5;
}
int main(){
int a = 2, b, c;
modify(a, b, &c);
cout << a <<" "<< b <<" "<< c;
return 0;
}
Choose the correct option for parameter list at LINE-1 such that the output is 2 4 7.
a) int &x2, int *x3
b) int x2, int *x3
c) int &x2, int &x3
d) int *x2, int &x3
Question 6. Consider the following code segment.
#include <iostream>
using namespace std;
int max(int a, int b){
return (a > b) ? a : b;
}
float max(float a, float b){
return (a > b) ? a : b;
}
int main(){
cout << max(3, 4.5); // LINE-1
return 0;
}
What will be the output/error?
a) 4.5
b) 3
c) Compilation Error at LINE-1: call to ’max’ is ambiguous
d) 4
Question 7. Consider the following code segment.
#include <iostream>
using namespace std;
void fun(int a, int b = 0){ cout << a + b << endl; }
void fun(double a, double b = 1.0){ cout << a * b << endl; }
int main(){
fun(2); // LINE-1
fun(2.0); // LINE-2
return 0;
}
Which line/s will give compilation error?
a) LINE-1
b) LINE-2
c) Both LINE-1 and LINE-2
d) No error
Question 8. Consider the following code segment.
#include <iostream>
using namespace std;
enum class Color { Red = 1, Green, Blue };
int main(){
Color c = Color::Red;
cout << static_cast<int>(c + 1); // LINE-1
return 0;
}
What will be the output/error?
a) 2
b) Compilation Error at LINE-1: invalid operands to binary +
c) 1
d) 3
Question 9. Consider the following code segment.
#include <iostream>
#include <stdlib.h>
using namespace std;
int main(){
int *p = new int[5]; // LINE-1
p[0] = 42;
cout << *p;
delete[] p;
return 0;
}
What will be the output?
a) 0
b) 42
c) Compilation Error
d) Segmentation fault
(Jan-Apr 2025)
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1) Consider the following function prototypes of function add().
Which of the following sets consists of all valid prototypes of function add()?
2) Consider the following function prototypes of function add().
Which of the above pairs of the prototypes is ambiguous and illegal as per the rule of function overloading?
3) Consider the following code segment.
What will be the output/error?
#include <iostream>
using namespace std;
int add(int n1) { return n1; }
int add(int n1, int n2) { return n1 + n2; }
double add(double d1) { return d1; }
int add(int n1, int n2, double n3) { return n1 + n2 + n3; }
int main() {
int r = add(10, 20);
cout << r << endl;
return 0;
}
A) 30
B) 130
C) 300
D) Compilation Error: call of overloaded add(int, int) is ambiguous
4) Consider the following code segment.
What will be the output?
#include <iostream>
using namespace std;
#define DOUBLE(x) (2 * x)
inline int TRIPLE(int x) { return 3 * x; }
int main() {
cout << DOUBLE(10 + 10) << endl;
cout << TRIPLE(10 + 10) << endl;
return 0;
}
A) 40 60
B) 30 60
C) 30 40
D) 20 30
5) Consider the following code segment.
Choose the correct option to fill in the blank at LINE—I such that the output is 11 11 20 20.
#include <iostream>
using namespace std;
int& incr(int i) {
return ++i;
}
int main() {
int x = 10, y = 20;
int& z = incr(x);
cout << x << " " << z;
incr(x);
cout << x << " " << z;
return 0;
}
A) int incr(int i)
B) int incr(int& i)
C) int& incr(const int& i)
D) int& incr(int& i)
6) Consider the following code segment.
What will be the output?
using namespace std;
#define CL 10 + 1
const int C2 = 10;
int main() {
int nl, n2;
nl = CL * 100 * C2;
n2 = C2 * 100 * CL;
cout << nl << " " << n2;
return 0;
}
A) 1110 11001
B) 1011 1011
C) 12100 12100
D) 11001 1110
7) Consider the following code segment.
What will be the output?
#include <iostream>
using namespace std;
int main() {
int i = 21;
int* ptr = &i;
cout << *ptr << " " << i;
return 0;
}
A) 21 32
B) 32 32
C) 21 44
D) 44 44
8) Consider the following code segment.
Identify the correct statement(s) to fill in the blank at LINE—I such that the output is X.
A) const char* cp
B) char* const cp
C) char const* cp
D) const char* const cp
9) Consider the following statement in C.
Among the given options below, identify the equivalent statement/s (perform the same task).
A) int* new int(5);
B) int* new int[5];
C) int* new int t operator new(sizeof(int) * 5);
D) int* (int*) operator new(sizeof(int))[5];
(July-Dec 2024)
Q1.Consider the following code segment.
What will be the output/error?
a) 5
b) 10
c) 0
d) Compilation Error at LINE-1: assignment of read only variable ‘p’
Answer: d) Compilation Error at LINE-1: assignment of read only variable ‘p’
Q2.Consider the following code segment.
What will be the output?
a) 3 4
b) 89
c) 84
d) 3 9
Answer: b) 89
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These are Programming in Modern C++ Week 2 Assignment Answers
Q3. Consider the following code segment.
Which line/s will give you an error?
a) LINE-1
b) LINE-2
c) LINE-3
d) LINE-4
e) LINE-5
Answer: a) LINE-1
b) LINE-2
Q4.Consider the following code segment.
What will be the output/error?
a) 10 21
b) 10 20
c) Compilation Error: attempt to increment a constant reference
d) Compilation Error: invalid initialization of non-const reference
Answer: c) Compilation Error: attempt to increment a constant reference
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These are Programming in Modern C++ Week 2 Assignment Answers
Q5. Consider the following code segment
What will be the output?
a) 6 6 4 4
b) 6 6 8 8
c) 3 3 4 4
d) 3 3 8 8
Answer: a) 6 6 4 4
Q6. Consider the following code segment.
Fill in the blank at LINE-1 such that the output is 20.
a) (int)malloc(20sizeof(int))
b) new int
c) new int (20)
d) new int [20]
Answer: c) new int (20)
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Q7. Consider the following code segment.
What will be the output/error?
a) 0
b) 5
c) 2
d) Compilation Error: invalid value in enum
Answer: c) 2
Q8. Consider the following code segment.
What will be the output/error?
a) 9.0
b) -1.0
c) -1
d) Compilation Error at LINE-1: Call of overloaded ‘calculate (int, int)’ is ambiguous
Answer: d) Compilation Error at LINE-1: Call of overloaded ‘calculate (int, int)’ is ambiguous
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Q9. Consider the following code segment.
Fill in the blank at LINE-1 with the correct function header.
a) vector operator* (vector &v1, vector &v2)
b) vector operator(vector v1, vector v2) c) int operator (vector v1, vector v2)
d) void operator*(vector v1, vector v2)
Answer: a) vector operator* (vector &v1, vector &v2)
b) vector operator(vector v1, vector v2) c) int operator (vector v1, vector v2)
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These are Programming in Modern C++Nptel Week 2 Assignment Answer
Programming Questions
W1_Programming-Qs.1
Consider the program below.
• Fill in the blank at LINE-1 to declare a stack variable st.
• Fill in the blank at LINE-2 to push values into the stack.
• Fill in the blank at LINE-3 with the appropriate statement.
The program must satisfy the given test cases.
Solution:
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W1_Programming-Qs.2
Consider the following program.
• Fill in the blank at LINE-1 with the appropriate if statement,
• Fill in the blank at LINE-2 and LINE-3 with the appropriate return statements.
The program must satisfy the sample input and output.
Solution:
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W1_Programming-Qs.3
Consider the program below.
• Fill in the blank at LINE-1 to include the appropriate header file to utilize the abs () function.
• Fill in the blank at LINE-2 to compute the Manhattan distance between two points pt1 and pt2 as pt1.ypt2.y+pt1.x pt2.r
The program must satisfy the given test cases.
Solution:
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(JAN-APR 2024)
Course Name: Programming in Modern C++
Course Link: Click Here
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These are Nptel Programming in Modern C++ Assignment 2 Answers
Quiz
Q1. Consider the following program.
What will be the output?
a)15
b)14
c)62
d)Compilation error:call of overload “add(int,int)”is ambiguous
Answer: b)14
Q2. Consider the following program.
What will be the output (Consider right to left execution of the cout statement)?
a) 7 4
b) 8 4
c) 4 4
d) 7 6
Answer: a) 7 4
Q3. Consider the following code segment.
What will be the output?
a) 6 6 2 2
b) 6 8 4 2
с) 6 6 4 4
d) 8 6 4 4
Answer: с) 6 6 4 4
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Q4. Consider the following code segment.
Fill in the blank at LINE-1 so that the program will print 1, 300.
a) int x3, int x4
b) int &x3, int* x4
c) int x3, int& x4
d) int x3, int* x4
Answer: d) int x3, int* x4
Q5. Consider the following code segment.
What will be the output?
a) 0
b) 10
c) Compilation error at LINE-1: ‘x’ declared as reference but not initialized
d) Compilation error at LINE-2: assignment of read only reference x
Answer: c), d)
c) Compilation error at LINE-1: ‘x’ declared as reference but not initialized
d) Compilation error at LINE-2: assignment of read only reference x
Q6. Consider the following code segment.
Fill in the blank at LINE-1 with appropriate option/s such that the output is: 11
a) const
b) volatile
c) static
d) inline
Answer: a) const
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Q7. Consider the following code segment.
Fill in the blank at LINE-1 so that the program will print a.
a) (char*)malloc (10*sizeof (char))
b) new char(‘a’)
c) new char (97)
d) new char [97]
Answer: b), c)
b) new char(‘a’)
c) new char (97)
Q8. Consider the following code segment.
What will be the output(s) /error(s)?
a) 97
b) 120
c) Error at LINE-1: cannot convert int* to const char* in initialization
d) Error at LINE-2: assignment of read-only location *p
Answer: c), d)
c) Error at LINE-1: cannot convert int* to const char* in initialization
d) Error at LINE-2: assignment of read-only location *p
Q9. Consider the following function prototypes of overloaded function func().
Which functions will be invoked for the call func (2.1, 3.7f)?
а) 2, 3, 5
b) 2, 3
c) 2
d) 1, 2
Answer: b) 2, 3
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These are Nptel Programming in Modern C++ Assignment 2 Answers
Question 1
Consider the program below.
• Fill in the blank at LINE-1 with an appropriate statement.
The program must satisfy the given test cases.
Solution:
#include <iostream>
using namespace std;
#define THRICE(X) ((X) * 3)For answers or latest updates join our telegram channel: Click here to join
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Question 2
Consider the following program.
• Fill in the blank at LINE-1 with appropriate formal arguments list.
• Fill in the blank at LINE-2 with the appropriate return statement.
The program must satisfy the sample input and output.
Solution:
#include <iostream>
using namespace std;
int sqr(int num) {
return num * num;
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Question 3
Consider the following program.
• Fill in the blanks at LINE-1 with appropriate function header
The program must satisfy the sample input and output.
Solution:
#include <iostream>
#include <string>
using namespace std;
void print(int a, int b) {
int r = b + 10 * a;
cout << r;
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Programming
Question 1
Consider the following program. Fill in the blanks as per the instructions given below:
• at LINE-1 with function header
such that it will satisfy the given test cases.
Solution:
#include <iostream>
using namespace std;
void print(int a, int b=0){
int r = b + a;
cout << r;
}These are Nptel Programming in Modern C++ Assignment 2 Answers
Question 2
Consider the following program. Fill in the blanks as per the instructions given below.
• at LINE-1 with appropriate function parameter,
• at LINE-2 with appropriate statement
such that it will satisfy the given test cases.
Solution:
#include <iostream>
using namespace std;
int Fun(int& x) {
x = x * x;
return x;
}These are Nptel Programming in Modern C++ Assignment 2 Answers
Question 3
Consider the following program. Fill in the blanks as per the instructions given below:
• at LINE-1 with appropriate function header,
• at LINE-2 with appropriate return statement
such that it will satisfy the given test cases.
Solution:
#include <iostream>
using namespace std;
struct point {
int x, y;
};
point operator+(point &pt1, point &pt2){
pt1.x += pt2.x;
pt1.y += pt2.y;
return pt1;
}These are Nptel Programming in Modern C++ Assignment 2 Answers
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(JULY-DEC 2022)
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Quiz
Q1. Consider the following program.
What will be the output/error(s)?
a) y
b) z
c) Compilation Error : default argument missing for “char add (char, char, char)”
d) Compilation Error : call of overload “add (char, char)” is ambiguous
Answer: c, d
Q2. Consider the following code segment.
What will be the output?
a) 12
b) 25
c) 9
d) 16
Answer: a) 12
These are Nptel Programming in Modern C++ Assignment 2 Answers
Q3. Consider the following code segment.
Which line/s will give you an error?
a) LINE-1
b) LINE-2
c) LINE-3
d) LINE-4
Answer: b, d
Q4. Consider the following code segment.
What will be the output/error?
a) 36
b) 30
c) 25
d) Compilation Error : invalid initialization of non-const reference
Answer: d) Compilation Error : invalid initialization of non-const reference
These are Nptel Programming in Modern C++ Assignment 2 Answers
Q5. Consider the following code segment.
What will be the output?
a) 6 6 2 2
b) 6 6 7 7
c) 1 1 2 2
d) 1 1 7 7
Answer: a) 6 6 2 2
Q6. Consider the following code segment.
Choose the appropriate option to fill in the blanks at LINE-1, such that the output of the code would be : 300 20000.
a) int n3, int* n4
b) int& n3, int n4
c) int n3, int* n4
d) int& n3, int& n4
Answer: b) int& n3, int n4
These are Nptel Programming in Modern C++ Assignment 2 Answers
Q7. Consider the following code segment.
What will be the output/error?
a) < garbage value >
b) 5
c) Compilation Error at LINE-1 : uninitialized const ‘ptr’
d) Compilation Error at LINE-2 : assignment of read-only variable ‘ptr’
Answer: c, d
Q8. Consider the following code segment.
What will be the output/error?
a) 5
b) 10
c) 5
10
d) Compilation error at LINE-2 : ambiguating new declaration of ‘int fun (int)’
Answer: d) Compilation error at LINE-2 : ambiguating new declaration of ‘int fun (int)’
These are Nptel Programming in Modern C++ Assignment 2 Answers
Q9. Consider the following code segment.
Fill in the blank at LINE-1 such that the program will print 5 + i3
a) complex operator+(complex &c1, complex &c2)
b) complex operator+(const complex &c1, const complex &c2)
c) operator+(complex &c1, complex &c2)
d) complex +(complex &c1, complex &c2)
Answer: a) complex operator+(complex &c1, complex &c2)
These are Nptel Programming in Modern C++ Assignment 2 Answers
Question 1
Consider the program below.
• Fill in the blank at LINE-1 to complete the function header.
The program must satisfy the given test cases.
Solution:
#include <iostream>
#include <string>
using namespace std;
void print(string a, string b="Any")
{ // LINE-1These are Nptel Programming in Modern C++ Assignment 2 Answers
Question 2
Consider the following program.
• Fill in the blank at LINE-1 with the appropriate parameter,
• Fill in the blank at LINE-2 with the appropriate return statement
The program must satisfy the sample input and output.
Solution:
#include <iostream>
using namespace std;
int Fun(int a){
// LINE-1
return a*a;
// LINE-2
}These are Nptel Programming in Modern C++ Assignment 2 Answers
Question 3
Consider the program below.
• Fill in the blank at LINE-1 to complete the function header
• Fill in the blank at LINE-2 to complete the return statement
The program must satisfy the given test cases.
Solution:
point operator+( point& pt, int& t) { //LINE-1
pt.x += t;
pt.y -= t;
return pt; //LINE-2
}
These are Nptel Programming in Modern C++ Assignment 1 Answers