Quiz 2 MI – 103 Duration: 30 minFull Marks: 30

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Rules: Answer in brief; Do not discuss with your friend during the test; Use the space provided in the question paper for answer; Extra answer sheet will not be given.

1. Define a class Word which can hold a word where the length of the word is specified in the constructor. Implement the constructor and the destructor. (Maximum 30 lines) 10 Marks

Ans. #include<iostream.h>#include<conio.h>#include<stdio.h>#include<string.h>class Word{char *word;int length;public:Word(){length=0;word=new char[length+1];}Word(char *s){length=strlen(s);word=new char[length+1];strcpy(word,s);}void display(){ cout<<word<<"\n";}};void main(){char *w1="Girl";Word word1(w1);Word word2("Good");word1.display();word2.display();}

2. Function templates can accept(A) any type of parameters (B) only one parameter (C) only parameters of the basic type (D) only parameters of the derived type 2 Mark

Ans. C

3. How many constructors can a class have? (A) 0 (B) 1 (C) 2 (D) any number 1 Mark Ans. D

4. Which of the following is the valid class declaration header for the derived class d with base classes b1 and b2?(A) class d : public b1, public b2 (B) class d : class b1, class b2 (C) class d : public b1, b2 (D) class d : b1, b2 1 Mark

Ans. A

5. Declaration of a pointer reserves memory space (A) for the object. (B) for the pointer. (C) both for the object and the pointer. (D) none of these. 2 Mark

Ans. B

6. If there is a pointer p to object of a base class and it contains the address of an object of a derived class and both classes contain a virtual member function abc(), then the statement p->abc(); will cause the version of abc() in the ____class to be executed. (A) Base Class (B) Derived class (C) Produces compile time error (D) produces runtime error. 2 Mark

Ans. B

7. Write short note (most important three lines) on(i) Constructor 3 Marks

A constructor is a member function which has the same name as at that of the class. It is used to initialize the data members of the class. A constructor is automatically invoked by the compiler when an object is created.

(ii) Stream 3 Marks Stream is defined as an interface supplied by the I/O system to the programmer and that which is independent of the actual device being used. These are basically of two types: one is when it is a source through which input can be taken and the other is when it acts as a destination to which output can be sent. The source stream is called the input stream and the destination stream is called the output stream.

(iii) Access control 3 MarksThis is done using access specifiers public, private and protected.

These access specifiers determine how elements of the base class are inherited by the derived. If no specifier is used the data member is private by default.

(iv) Friend 3 Marks Friend is keyword in C++ which is used to declare friend function and friend classes. It can access the private data members of the class it has to take the help of the object of that class. A friend function is not the member of the class.

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