Programming Using C++ — DU B.Sc. (Hons) Computer Science Previous Year Question Papers

4. Parts of question must be answered together. 1. (a) Explain dynamic initialization of a variable with a suitable example. 3 (b) Differentiate with the help of an example 6 (i) Static and dynamic polymorphism. (i) Break and continue statement (c) Find out the errors) in following code snippets after execution giving 10 (i) #include ‹iostream› (ii) #include <iostream> return 0; return × * y; int main () #include <iostream> cout « fun (5,10); int main () ifstream file; file.open ("data.txt": file «< "Hello, Worl file. close (); return 3; (iv) #include <iostream› return × + yi int main () int z = add (3, 4) ; cout << z; return 0; (v) #include <iostream› using namespace std; class Student public: student (int age, string course) this-›age = age; this->course = course; void display () cout «< "Age: " ‹< age ‹< ", Course: " « course ‹< endl; private: int age; string course; int main () S1.display () ; return 0; (d) Convert the following recursive function to iterative version: 5 return n; return func (n - 1) + func (n - 2) ; (e) Write a Ct+ program to swap two numbers using function template. 6 Section-B ri (a) Write a C++ program to print the following pattern for n rows: 5 (b) Which of the following identifiers are valid? Give reasons. 5 (iii)_number (c) Observe the code below and answer the question: 5 A () { cout ‹< "A Constructor\n"; } A () | cout ‹< "A Destructor\n"; } class B : public A { B () { cout << "B Constructor\n"; } BI) | cout «< "B Destructor\n". ) int main () (i) What will be the output? (ii) Explain the order of constructor and destructor execution. (b) Write the output of the following code fragment after execution: 5 (c) Write a function largest (int a, int b, int c) that finds 5 greatest of three given numbers. Write a main function that reads three integers a, b, c from the user and uses largest to print greatest of three numbers. 4. (a) Write a C+t program to create a class BankAccount with member 8 functions to deposit, withdraw and display balance. Define a default constructor for this class with 0 balance. Define functions to take input and display the balance of the customers (objects). Write a Ct+ program that defines a template function min which accepts 7 (b) two parameters of any type and returns the minimum of the two values. Test the function with int, float, and char types. member functions addition, subtraction, multiplication, and division. Use objects of the class to perform arithmetic operations on two numbers. (b) help of a C++ program. Design a C+t program to demonstrate multilevel inheritance using the 10 (a) following classes: class School (Base class) with attributes: school_name and location. class Grade (Intermediate class): Inherits from School and adds attributes: grade_name and teacher. class Student (derived class): inherits from Grade and adds attributes: student_name and marks.