1. Question answers on constructor and destructor and class and object Pournomi Sen PGT,Comp Sc K.V Ballygunge

2. 2009 1)What is copy constructor?Give an example in C++ to illustrate copy constructor. (2) 2)Answer the questions i)and ii) after going through the following class Class work { Int workId; Char workType; Public: ~work() -  function1 {cout<<“un-allocated”<<endl;} Void status()  Function2 { cout<<workId<<:<<eorkType<<endl;} work()  function 3 { workId=10;workType=‘T’;} work(work &W)  function4 { workId=w.workId+12; workType=w.workType+1; } }; Qs:- i)Which member function out of function1,function2,function3 and function4 shown in above definition of class work is called automatically,when the scope of the object gets over?Is it known as constructor OR destructor OR overloaded function OR copy constructor? ii)Work w;  statement1 Work y(w);  statement2 i)Which member function out of function1,function2,function3 and function4 shown in above definition of class work will be called an execution of statement written as statement 1 and statement2?What are those functions specifically known as?

3. Define a class Resort in C++ with the following description:- Private members:- Rno  data member to store room no Name  Data member to store customer name Charges  Data member to store per day charges Days  Data member to store number of days to stay Compute()  A function to calculate and return Amount as days*charges and if the value of Days *charges is more than 11000 then as 1.02*Days*charges Public members:- Getinfo()  A function to enter the content Rno,Name,charges,and Days Dispinfo()  A function to display Rno,Name,charges,days and amount(amount to be displayed by calling function Compute)

4. 2008 b)Answer the questions i) to ii) after going through the following program:- #include Class Bazar {char Type[20]; char product[20]; int Qty;float price; Bazar() { strcpy(Type,”Electronic”); Strcpy(product,”Calculator”); Qty=10;price=225;} Public: Void disp() { cout<<Type<<“- ”<<product<<“:”<<Qty<<“@”<<price<<e ndl; } }; Void main() { Bazar B;  statement 1 B.Disp();  statement 2 } Qs:- i)Will statement 1 initialize all the data members for object B with the values given in the function 1?(Yes Or No).Justify your answer suggesting the correction(s) to be made in the above code. Ii)What will be the possible output when the program gets executed?(Assuming if required,the suggested corrections are made in the program) 2.a)Differentiate between public and private visibility modes in context of Object Oriented Programming using a suitable example illustrating each. (2)

5. c)Define a class Garments in C++ with the following descriptions:- Private members:- GCode  of type string GType  of type string GSize  of type integer GFabric  of type string GPrice  of type float A function Assign() which calculates and assigns the value of GPrice as follows:- For the value of GFabric “COTTON”, Gtype GPrice(Rs) Trouser 1300 Shirt 1100 For GFabric other than “COTTON” the above mentioned GPrice gets reduced by 10% Public members:-A constructor to assign initial values to GCode,GType and GFabric with the word “NOT ALLOTTED” and GSize and GPrice with 0. A function Input() to input the values of the data members GCode,GType,GSize and GFabric and invoke he assign function. A function Display() which displays the content of all the data members for a Garment.

6. b) Answer the questions(i) and (ii) after going through the following program : 2 class number { float M; char str[25]; public: number( ) //constructor 1 { M=0; str=’\0’; } number(number &t); //constructor 2 }; i) Write c++ statement such that it invokes constructor 1. ii) Complete the definition for constructor 2.

7. c) Define a class SalesCounter with folloeing specifications: 4 Data members: Net_amt, Amount –> Real values ClothType - string( 30), Pay_mode string (30) Member functions Constructor – to initialize the Amount as 0, ClothType as “Cotton”, Pay_mode as “Cash”, Net_amt as 0 Calc_net () – to calculate discount and net_amt. The Company offers discount scheme on each purchase to the customer. The scheme is as follows For Cotton Purchase above 5000 and avail discount of 10% Purchase above 7500 and avail discount of 15% For Silk Purchase above 5000 and avail discount of 5% Purchase above 7500 and avail discount of 10% – For Synthetic –Purchase above 5000 and avail discount of 15% Purchase above 7500 and avail discount of 25% Now if the customer is paying by Cash an additional 2% discount will be given to them. If by Cheque no discount will be given, if payment mode is credit card 2.5% tax has to be paid by the customer on the total purchase. –Purchase () – The Salesman will enter the detail of the purchasing made by the customer and will also enter the payment mode(CASH/CHEQUE/CREDIT CARD ), and will invoke the Calc_net() to calculate the net amount –Show() – The function will generate the bill to the customer along with the purchase details and the amount to be paid

8. Given the following C++ code, answer the questions (2) Class TEST {int time; public: TEST( )//Function 1 { time=0; cout<<”hai”; } ~ TEST( )//Function 2 {cout<<”hello”; } void exam( ) //Function 3 { cout<<”god bless u”; } TEST(int Duration) //Function 4 { time=Duration; cout<<”Exam starts”; } TEST(TEST &T)//Function 5 { time = T.Duration; cout<<”Exam Finished” } }; In Object Oriented Programming, what is Function 1 referred as and when does it get invoked/called? In Object Oriented Programming, what is Function 2 referred as and when does it get invoked/called? Which category of constructor Function 5 belongs to and what is the purpose of using it? Write statements that would call the member Function 1 and 4