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DCS 5088 OBJECT ORIENTED PROGRAMMING LAB 3

LAB 3

Objective

At the end of this lab activity, the students should be able to:

Implement the main concepts in object-oriented programming.

Use control structures.

Create classes and objects.

Create arrays of objects.

MULTIMEDIA UNIVERSITY 1

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EXERCISE 1

(a) As a programmer, you are requested by A-Plus Tuition Center to develop a simple

program to enterand display students details. You are required to use classes for this

exercise. (For this exercise, you are required to enter information for one student only)

Suggested output:

STEPS

1. (i) Create a class called Student.

(ii) The data members are : name(char), location(char), ic(char) and

age(int). All data members must be declared as private.

(iii) The member functions are : void set_data() and void print(). All

member functions must be declared as public.

2. In member function set_data(), get input from the user and set the values to the

data members.


--------------------------------WELCOME TO A-PLUS TUITION CENTER--------------------------------Enter Name : Usha VellappanEnter Location : MelakaEnter IC : 750217016680Enter age : 30

--------------------------------STUDENT INFOMATION--------------------------------Name : Usha VellappanIC : 750217016680Location : MelakaAge : 30

Press any key to continue

class Student{

private :

char name[30],location[50], ic[14];

int age;public :

void set_data();

void print();

void set_data(){

cout

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3. In member function print(), display all the information on screen.

4. In function main(), create an object of class Student called S1.

5. From main(), call both member functions set_data() and print().

6. Save and compile your codes, correct any errors encountered.

7. Execute your program.

SOLUTION


void print(){

cout

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(b) Modify the program above so that the information of 3 students can be entered. You have

to declare object S1 as an array of 3 elements. You are required to use forloop for this

program.

SOLUTION


#include#include

class Student{

private :char name[30],location[50], ic[14];int age;

public :void set_data(){

cin.getline(name,30);cout

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EXERCISE 2

(a) Write a complete code based on the following information.

(i) Create a class called Purchase.

(ii) Data member (set to private) : name(char), qty(int), price(float) and

total(float).

Member function : declare the member functions outside of the class.

(a) set_data()

To set all the data to the appropriate variables.

(b) calculate()

Calculate the total amount of payment to be made.

(c) print()

Display all the information on screen.

(iii) In main() function, create an object of class Purchase called p.

(iv) In main() function get input from the user and pass the data to method

set_data() so that the values can be set to the appropriate variables.

(v) In main() function call function calculate() to calculate the total amount to be

paid by a customer.

(vi) In main() function call function print() to display all the information as shown

below.


========================WELCOME

========================Enter name : MaryEnter quantity : 2Enter price : RM 20========================

RECEIPT========================Name : MaryQuantity : 2Price : RM 20Payment : RM 40


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SOLUTION


#include#include

class Purchase

{char name[30];int qty;float price, total;

public :void set_data(char [], int, float);void calculate();void print();

};

void Purchase::set_data(char n[], int quantity, float p){

strcpy(name, n);qty = quantity;price = p;

}

void Purchase::calculate(){

total = qty * price;}

void Purchase::print(){

cout

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(b) Modify the program above, so that it will continue to execute until the user enters Y to

quit.

(Use while loop for this program). The suggested output is shown below.


Would you like to quit ? [Y/N] :N

========================WELCOME

========================Enter name : DavidEnter quantity : 2Enter price : RM 20========================

RECEIPT========================Name : David

Quantity : 2Price : RM 20Payment : RM 40

Would you like to quit ? [Y/N] :N

========================WELCOME

========================Enter name : JohnsonEnter quantity : 1Enter price : RM 100========================

RECEIPT========================

Name : JohnsonQuantity : 1Price : RM 100Payment : RM 100

Would you like to quit ? [Y/N] :Y


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SOLUTION


#include#include

class Purchase{

char name[30];int qty;float price, total;

public :void set_data(char [], int, float);void calculate();void print();

};

void Purchase::set_data(char n[], int quantity, float p){

strcpy(name, n);qty = quantity;price = p;

}

void Purchase::calculate() { total = qty * price; }

void Purchase::print(){

cout

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EXERCISE 3

(a) Write a complete program based on the information given below.

(i) Create a class called Marks.

(ii) Data member (set to private) : name(char), gpa(float) and grade(char)

Member function : declare the member function in the class.

(a) char set_name()

Get name from user and set the value to name.

(b) float set_gpa()

Get the gpa from the user and set the value to gpa.

(c) float set_grade()

Calculate the Grade based on the following data.

o GPA 3.00 to 4.00 = grade A.

o GPA 2.00 to 2.99 = grade B.

o GPA 0.00 to 1.99 = grade F.

(iii) Create an object called M in main() function.

(iv) Call all the three functions from main().

(v) Print the name, gpa and grade in main() function.

(iv) Suggested output is as shown below.


===================================ENTER INFORMATION

===================================Enter name : David Copperfield

Enter CGPA : 3.33

===================================RESULT SLIP

===================================Name : David CopperfieldGPA : 3.33Grade : A


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SOLUTION


#include#include

class Marks{char name[30], grade;float gpa;

public:char *set_name(){

cout

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