BCS2233 OOP. Lab 16 May 2017 (Inheritance)

1. Create a base class named Point consisting of x and y data members representing point coordinates. From this class, derive a class named Circle with another data member named radius. For this derived class, the x and y data members represent a circle’s centre coordinates. The member method of the Point class should consist of a constructor that set the value for x and y to 0, an area() method that return 0.

The derived class should has an override method named area() that return’s a circle area.
Area = 3.14 x radius².

 Draw UML diagram for the class Point and class Circle and then implement the class. Write a test program that creates one Point object and one Circle object with x 5, y 7 and radius 13. Display x and y for Point Object; x, y and radius for Circle Object.

2.  Create a class named Rectangle that contains data fields for height and length and a method named getArea() that returns the area of this Rectangle. Create a child class (derived from Rectangle) named Cube. Cube contains an additional data field named depth, and a getArea() method that overrides the parent method. Draw the UML diagram for the class (Class Rectangle and Class Cube) and then implement the class. Write a test program that creates one Rectangle object with height 4 and length 40 and one Cube object height 15, length 20 and depth 45. Display height, length and area of each object.

BCS2233 OOP. Lab 25 April 2018

Give both Structured and Object Oriented solution for the following problems.

 1.    Write a java program that reads the length and height of a rectangle and computes its area and parameter using the following formulas:-
Area = length x height
Perimeter = 2 x (length + height)

Structured: https://drive.google.com/file/d/0BxDLK8tlx2V1dEo0MGRRY3FLcmM/view?usp=sharing


2.    Write a java program that reads the height of a cube  and computes its area and parameter using the following formulas:-
Area = height2
Perimeter = 4 x height

Structured: https://drive.google.com/file/d/0BxDLK8tlx2V1MzM4SERjQkctLUk/view?usp=sharing



3.    Write a program that reads in the radius and length of a cylinder and computes its volume using the following formulas:

Area = radius * radius * 3.14
Volume = area * length

BCS2233 OOP. Method.

By implementing functions (also called methods) in a program,  programmer reduces coding time and debugging time, thereby reducing the overall development time.
Consider the following Java program. Create and use method where necessary.

//program 1

import java.util.Scanner;

public class tambahNombor {

   

    public static void main(String[] args) {

               int N1,N2,hasiltambah;

               Scanner input= new Scanner(System.in);

               System.out.println("Sila masukkan dua nombor");

               N1= input.nextInt();

               N2= input.nextInt();

               hasiltambah=N1+N2;

               System.out.println("Hasil tambah dua nombor ialah "+hasiltambah);

              

               System.out.println("Sila masukkan dua nombor");

               N1= input.nextInt();

               N2= input.nextInt();

               hasiltambah=N1+N2;

               System.out.println("Hasil tambah dua nombor ialah "+hasiltambah);

              

               System.out.println("Sila masukkan dua nombor");

               N1= input.nextInt();

               N2= input.nextInt();

               hasiltambah=N1+N2;

               System.out.println("Hasil tambah dua nombor ialah "+hasiltambah);

              

               System.out.println("Sila masukkan dua nombor");

               N1= input.nextInt();

               N2= input.nextInt();

               hasiltambah=N1+N2;

               System.out.println("Hasil tambah dua nombor ialah "+hasiltambah);

              

    }

}

 

//program 2

import java.util.Scanner;

 public class sumInteger {

   

    public static void main(String[] args) {

               int N1,N2,sum,count;

               Scanner input = new Scanner(System.in);

   

               System.out.println("Sila masukkan dua nombor!");

               N1= input.nextInt();

               N2= input.nextInt();

               sum=0;

               for(count=N1;count<=N2;count++)

               {

                  sum=sum+count;

               }

        System.out.println("Hasil tambah "+N1+" hingga "+N2+" ialah " + sum);

   

   

        System.out.println("Sila masukkan dua nombor ");

               N1= input.nextInt();

               N2= input.nextInt();

               sum=0;

               for(count=N1;count<=N2;count++)

               {

                  sum=sum+count;

               }

        System.out.println("Hasil tambah "+N1+" hingga "+N2+" ialah " + sum);

       

       

        System.out.println("Sila masukkan dua nombor!");

               N1= input.nextInt();

               N2= input.nextInt();

               sum=0;

               for(count=N1;count<=N2;count++)

               {

                  sum=sum+count;

               }

        System.out.println("Hasil tambah "+N1+" hingga "+N2+" ialah " + sum);

      

    }

}

//program 3

import java.util.Scanner;

public class bmi {

   

    public static void main(String[] args) {

               double berat,tinggi,BMI;

               String status;

               Scanner input = new Scanner(System.in);

               System.out.println("Sila masukkan berat (KG) dan tinggi (Meter)");

               berat = input.nextDouble();

               tinggi = input.nextDouble();

               BMI=berat/(tinggi*tinggi);

              

               if(BMI<18 .5="" p="">

                    System.out.println("underweight");

               else if((BMI>=18.5)&&(BMI<=24.9))

                               System.out.println("healthy");

               else if((BMI>=25)&&(BMI<=29.9))

                               System.out.println("overweight");

               else if (BMI>=30)

                               System.out.println("obes");

              

              

               System.out.println("Sila masukkan berat (KG) dan tinggi (Meter)");

               berat = input.nextDouble();

               tinggi = input.nextDouble();

               BMI=berat/(tinggi*tinggi);

              

               if(BMI<18 .5="" p="">

                    System.out.println("underweight");

               else if((BMI>=18.5)&&(BMI<=24.9))

                               System.out.println("healthy");

               else if((BMI>=25)&&(BMI<=29.9))

                               System.out.println("overweight");

               else if (BMI>=30)

                               System.out.println("obes");

                              

                              

               System.out.println("Sila masukkan berat (KG) dan tinggi (Meter)");

               berat = input.nextDouble();

               tinggi = input.nextDouble();

               BMI=berat/(tinggi*tinggi);

              

               if(BMI<18 .5="" p="">

                    System.out.println("underweight");

               else if((BMI>=18.5)&&(BMI<=24.9))

                               System.out.println("healthy");

               else if((BMI>=25)&&(BMI<=29.9))

                               System.out.println("overweight");

               else if (BMI>=30)

                               System.out.println("obes");

    }

}

//program 4

import java.util.Scanner;

public class ulangPesanan {

   

    public static void main(String[] args) {

               Scanner input = new Scanner(System.in);

               String pesanan;

               int i,jumlahUlangan;

              

               System.out.println("Sila masukkan Pesanan :");

               pesanan = input.nextLine();

               System.out.println("Berapa kali nak ulang ? :");

               jumlahUlangan = input.nextInt();

       

        for (i=1;i<=jumlahUlangan;i++)

        {

           System.out.println(pesanan);

        }

     

      System.out.println("Sila masukkan Pesanan :");

               pesanan = input.nextLine();

               System.out.println("Berapa kali nak ulang ? :");

               jumlahUlangan = input.nextInt();

       

        for (i=1;i<=jumlahUlangan;i++)

        {

           System.out.println(pesanan);

        }

       

        System.out.println("Sila masukkan Pesanan :");

               pesanan = input.nextLine();

               System.out.println("Berapa kali nak ulang ? :");

               jumlahUlangan = input.nextInt();

       

        for (i=1;i<=jumlahUlangan;i++)

        {

           System.out.println(pesanan);

        }

     

       

    }

}