diff --git a/Week 3/Equipment.java b/Week 3/Equipment.java
new file mode 100644
index 0000000..b54b13b
--- /dev/null
+++ b/Week 3/Equipment.java	
@@ -0,0 +1,42 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ * This class simulates an Equipment 
+ *
+ * @author Bhaskar Tejaswi
+ */
+import java.util.*;
+
+public class Equipment {
+
+    public String id;
+    public String description;
+  
+    public Equipment(String eqId,String desc){
+      
+        id = eqId;
+        description = desc;
+    }
+    
+    public String getId()
+    {/*return id and description to IFSC manager, then, IFSC manager initialises the id and description
+        by these returned values*/    
+       Scanner sc = new Scanner(System.in);
+       String idEq =  sc.next();
+       return idEq;
+    }
+    
+    public String getDesc(){
+    
+        Scanner sc = new Scanner(System.in);
+        String desc = sc.next();
+        return desc;
+    }
+    
+    
+    
+}
diff --git a/Week 3/IFCSManager.java b/Week 3/IFCSManager.java
new file mode 100644
index 0000000..eafb66c
--- /dev/null
+++ b/Week 3/IFCSManager.java	
@@ -0,0 +1,209 @@
+/**
+ *This class simulates an IFCS Manager
+ * It allows user to add, remove or search equipments..
+ * User can also get a list of all Equipments in the Lab
+ * @author Bhaskar Tejaswi
+ */
+import java.io.*;
+import java.util.*;
+public class IFCSManager {
+   
+    Equipment equip[] = new Equipment[100];
+    int pointer=0;/* we want all instances of manager to have same content of pointer*/
+  /**
+   * Add an Equipment by this function
+   */
+   public void add()
+   { 
+               Scanner sc = new Scanner(System.in);
+               
+                                    int flag=0;
+                                    
+                                    System.out.println("Enter Id :");                    
+                                    String idEq = equip[pointer].getId();
+                                    
+                                    System.out.println("Enter Description :");
+                                    String desc = equip[pointer].getDesc();
+ 
+                                int f=0,choice;  
+                                for(int i=0;i<pointer;i++)
+                                {     
+                                if(equip[i].id.equals(idEq))
+                                {
+                                    f=1;
+                                    break;
+                                }
+                             }
+    
+                                    if(idEq==null)
+                                    {
+                                    System.out.println("Id cannot be null");
+                                    }
+                                    
+                                    else if (desc=="")
+                                    {
+                                    System.out.println("Description cannot be null");
+                                    }
+                                    
+                                    else if(idEq =="" && desc=="")
+                                    {
+                                    System.out.println("Neither Description nor id can be null");
+                                    }
+                                    else if(f==1){
+                                    System.out.println("Equipment already exists!");
+                                    }
+                                    else
+                                    {
+                                    equip[pointer].id = idEq;
+                                    equip[pointer].description = desc;
+                                    pointer++;   /**no of equipments incremented by 1 */
+                                    
+                                    System.out.println("Equipment insertion complete");
+                                    }
+                                }
+   /**
+    * Remove an Equipment by this function
+    * @param idEq 
+    */
+    public void remove(String idEq){
+                            int flag=0,pos=0;
+                                for(int i=0;i<pointer;i++)
+                                {
+                                   
+                                if(equip[i].id.equals(idEq))
+                                {
+                                    equip[i].description = null;   /* object set to null*/
+                                    equip[i].id = null;   /* object set to null*/
+                                    
+                                    flag=1;
+                                    pos=i;
+                                    break;
+                                }
+                             }
+                                if(flag==0)
+                                    System.out.println("Equipment with id "+idEq+" cannot be found");
+                              
+                                else
+                                {
+                                   for(int j=pos;j<pointer-1;j++)
+                                   {  
+                                    equip[j].description = equip[j+1].description;  
+                                    equip[j].id = equip[j+1].id;                                    
+                                   }    
+                                   System.out.println("It was found and removed");        
+                                    equip[pointer-1].description = null;   /* object set to null*/
+                                    equip[pointer-1].id = null;   /* object set to null*/
+                                   
+                                   pointer = pointer-1;
+                                }
+                            }
+    /**
+     * Display list of Equipments 
+     */
+    public void show(){
+        if(pointer==0){System.out.println("There are no equipments in the Lab");}else{
+           for(int i=0;i<pointer;i++){
+                                if(equip[i]!=null)
+                                {
+                                System.out.println("id = "+equip[i].id + " Description = "+equip[i].description);
+                                }
+                                }
+        }
+    }
+    
+    /**
+     * Search for an Equipment using Equipment Id.
+     * @param idEq 
+     */
+    public void search(String idEq){
+                                 int flag=0,pos=0;  
+                               for(int i=0;i<pointer;i++)
+                                {     
+                                if(equip[i].id.equals(idEq))
+                                {
+                                    flag=1;
+                                    pos=i;
+                                    break;
+                                }
+                             }
+                                if(flag==0)
+                                    System.out.println("Equipment not found!");
+                                else
+                                {
+                                    System.out.println("ID = "+equip[pos].id);
+                                    System.out.println("Description = "+equip[pos].description);
+                                    
+                                }
+                                    
+    }
+    
+    /**
+     * Main function
+     * @param args 
+     */
+    public static void main(String[] args){
+    
+    IFCSManager Manager = new IFCSManager();
+    Scanner sc  = new Scanner(System.in);
+    for(int i=0;i<100;i++)
+    {
+        Manager.equip[i]= new Equipment("","");
+    }
+    int choice;
+   do {
+                System.out.println("Perform the following methods:");
+                System.out.println("1: Add an Equipment");
+                System.out.println("2: Remove");
+                System.out.println("3: Search");
+                System.out.println("4: Display");
+                System.out.println("5: Quit");
+                choice = sc.nextInt();
+                
+                /* read user input */
+                    switch (choice)
+                    {
+                             case 1:       /*add equipment**/  
+                             Manager.add();
+                             break;
+                              
+                            case 2: /*remove equipment*/
+                            
+                            System.out.println("Enter the id of the equipment you want to remove :");
+                            String idEq;int flag=0,pos=0;
+                            idEq = sc.next();
+                            if(idEq=="")
+                            {
+                              System.out.println("Id cannot be null");
+                            }
+                            else
+                            {                   /* id is valid */
+                            Manager.remove(idEq);
+                            }
+                            break;
+                                
+                            case 3:
+                                System.out.println("Enter id to search");
+                                String id = sc.next();
+                                if(id=="")
+                                    System.out.println("Eq ID cannot be null!");
+                                else
+                                    Manager.search(id);
+                                                        
+                            break;
+                                
+                            case 4: /*display inventory*/
+                                    Manager.show();
+                            break;
+                                
+                            case 5: /*exit*/
+                                System.out.println("Program terminating ….");
+                            break;
+     
+                            default: System.out.println("Invalid Input!");
+                            break;
+                    }
+            } while (choice != 5);
+    System.out.println("Thank You!");
+    }
+    
+}
diff --git a/Week 3/Questions.docx b/Week 3/Questions.docx
new file mode 100644
index 0000000..71d1634
Binary files /dev/null and b/Week 3/Questions.docx differ
diff --git a/Week 3/Questions.md b/Week 3/Questions.md
new file mode 100644
index 0000000..e69de29
diff --git a/Week 3/Triangle.java b/Week 3/Triangle.java
new file mode 100644
index 0000000..1dd93fe
--- /dev/null
+++ b/Week 3/Triangle.java	
@@ -0,0 +1,124 @@
+/**
+ * This class simulates a Triangle
+ * @author Bhaskar Tejaswi
+ */
+import java.util.Scanner;
+public class Triangle {
+   
+    private int base;
+    private int height;
+    /**
+     * Default constructor
+     * @param myBase base of the triangle
+     * @param myHeight height of the triangle
+     */
+    public Triangle(int myBase,int myHeight){
+        base = myBase;
+        height = myHeight;
+    }
+    /**
+     * This method returns area in double
+     * @return area in double
+     */
+    public double getArea(){
+       return 0.5*base*height;
+    }       
+   
+    /**
+     * This method displays the dimensions and the area of the triangle
+     */
+    public void show(){
+        System.out.println("base = "+base+" units");
+        System.out.println("height = "+height+" units");
+        System.out.println("Area = "+getArea()+" sq units");
+    }
+    /**
+     * This method compares two triangles on the basis of their area
+     * @param myTriangle1 first triangle
+     * @param myTriangle2 second triangle
+     */
+    public void compare(Triangle myTriangle1,Triangle myTriangle2){
+        Scanner sc = new Scanner(System.in);
+       
+        if(myTriangle1.base==0 && myTriangle1.height==0)
+                        System.out.println("The triangle 1 has not been initialized");
+                    else{
+                        System.out.println("enter the base :");
+                            int myBase2=sc.nextInt();
+                            System.out.println("enter the height :");
+                            int myHeight2 = sc.nextInt();
+                            if(myBase2<=0 ||myHeight2<=0){
+                                System.out.println("Please enter only positive integers for base and height of second triangle ");
+                            }
+                            else{
+                            myTriangle2= new Triangle(myBase2,myHeight2);
+                            if (Double.compare(myTriangle1.getArea(), myTriangle2.getArea())>0)
+                            System.out.println("Our first Triangle is bigger..");
+                            else if(Double.compare(myTriangle1.getArea(), myTriangle2.getArea())<0)
+                            System.out.println("The second Triangle is bigger..");
+                            else
+                            System.out.println("Both have same area..");   
+                    }
+                }
+    }
+    /**
+     * Main function
+     * @param args-string args[]
+     */
+    public static void main(String[]args){
+   
+        Triangle myTriangle1 = new Triangle(0,0);
+        Triangle myTriangle2 = new Triangle(0,0);
+        Scanner sc = new Scanner(System.in);
+         int choice=0;
+           do {     System.out.println("Enter your choice :");
+                    System.out.println("1: Initialize first Triangle");
+                    System.out.println("2. Calculate Area");
+                    System.out.println("3: Compare with another Triangle");
+                    System.out.println("4: Show dimensions of first triangle ");
+                    System.out.println("5: quit");
+                    choice = sc.nextInt();
+            switch (choice)
+                {
+                case 1:     /*initialize first triangle*/
+                            System.out.println("enter the base :");
+                            int myBase1=sc.nextInt();
+                            System.out.println("enter the height :");
+                            int myHeight1 = sc.nextInt();
+                            if(myBase1<=0 ||myHeight1<=0)
+                            System.out.println("Please enter only positive integers for base and height ");
+                            else
+                            {
+                            myTriangle1= new Triangle(myBase1,myHeight1);
+                            System.out.println("Triangle inilialized successfully..");
+                            }      
+                break;
+                   
+                case 2:     /*calculate area*/
+                            if(myTriangle1.base==0 && myTriangle1.height==0 )
+                            System.out.println("The Triangle 1 has not been initialized");
+                            else
+                            System.out.println("Area is "+myTriangle1.getArea()+" sq units");                               
+                break;
+                   
+                case 3:  /*compare */
+                         myTriangle1.compare(myTriangle1,myTriangle2);   
+                break;
+                case 4: if(myTriangle1.base==0 && myTriangle1.height==0)
+                        System.out.println("The first triangle has not been initialized");
+                        else
+                       {
+                        myTriangle1.show();
+                       }
+                break;  
+               
+                case 5: System.out.println("Program terminated.");
+                break;
+                default: System.out.println("Wrong choice");
+                break;
+                }
+  } while (choice != 5);
+       
+System.out.println("Thank You!");
+    }
+}
\ No newline at end of file
diff --git a/Week 4/CSEStudent.java b/Week 4/CSEStudent.java
new file mode 100644
index 0000000..3a4b7f9
--- /dev/null
+++ b/Week 4/CSEStudent.java	
@@ -0,0 +1,26 @@
+/**
+ *
+ * @author Bhaskar Tejaswi
+ */
+public class CSEStudent extends Student{
+    
+    public final String hobby= "Hacking";
+    
+    CSEStudent(String name)
+    {
+        super(name);
+    }
+  
+    public void introduce(){
+       System.out.println("Hello my name is "+retName() +" and my hobby is "+hobby);
+    }
+    public void onFacebook(){
+        super.introduce();
+    }
+    public void isHacker(){    
+            introduce();
+    }
+    public void isReader(){
+            super.isReader();
+    }
+}
\ No newline at end of file
diff --git a/Week 4/Circle.java b/Week 4/Circle.java
new file mode 100644
index 0000000..8c9b409
--- /dev/null
+++ b/Week 4/Circle.java	
@@ -0,0 +1,25 @@
+
+
+/**
+ *
+ * @author Bhaskar Tejaswi
+ */
+public class Circle extends Shape {
+   
+    private double radius;
+
+    Circle(double radius)
+    {
+   
+        super("Circle");
+        this.radius = radius;
+       
+    System.out.println("Constructor of Circle with parameter "+radius);
+    }
+    void printDescription(){
+        name  = "Rectangle";
+        System.out.println("Radius = "+radius);
+        System.out.println("Area = "  +3.14*radius*radius+" sq units");
+       
+    }
+}
\ No newline at end of file
diff --git a/Week 4/Person.java b/Week 4/Person.java
new file mode 100644
index 0000000..99f1bc8
--- /dev/null
+++ b/Week 4/Person.java	
@@ -0,0 +1,29 @@
+/**
+ *
+ * @author Bhaskar Tejaswi
+ */
+import java.util.*;
+public class Person {
+    Scanner sc = new Scanner(System.in);
+    public final String hobby = "Reading";
+    private String name;
+    public Person(String name)
+    {
+        this.name = getName();        
+    }
+    public String getName(){   
+        System.out.println("Enter name:");
+        name = sc.next();
+        return name;
+    }
+    public String retName(){
+        return name;
+    }
+
+    /**
+     *
+     */
+    public void introduce(){
+    System.out.println("Hello my name is "+name +" and my hobby is "+hobby);
+    }
+}
diff --git a/Week 4/Questions.docx b/Week 4/Questions.docx
new file mode 100644
index 0000000..e01991b
Binary files /dev/null and b/Week 4/Questions.docx differ
diff --git a/Week 4/Rectangle.java b/Week 4/Rectangle.java
new file mode 100644
index 0000000..3eee6c2
--- /dev/null
+++ b/Week 4/Rectangle.java	
@@ -0,0 +1,29 @@
+
+/**
+ *
+ * @author Bhaskar Tejaswi
+ */
+public class Rectangle extends Shape {
+   
+    double length;
+    double breadth;
+   
+    Rectangle(double length, double breadth){
+        super("Rectangle");
+        this.length = length;
+        this.breadth = breadth;
+    System.out.println("Constructor of Rectangle with parameters "+length+" and "+breadth);
+    }
+       void printDescription(){
+       
+        System.out.println("Length = "+length);
+        System.out.println("Length = "+breadth);
+        System.out.println("Area = "  +areaOf()+" sq units");    
+    }
+       double areaOf(){
+           return length*breadth;
+       }
+   
+   
+   
+}
diff --git a/Week 4/Shape.java b/Week 4/Shape.java
new file mode 100644
index 0000000..b3faaa1
--- /dev/null
+++ b/Week 4/Shape.java	
@@ -0,0 +1,17 @@
+/**
+ *
+ * @author Bhaskar Tejaswi
+ */
+public class Shape {   
+    String name="";   
+   
+    Shape(String name)
+    {
+        this.name = name;
+        System.out.println("Constructor of Shape");
+    }
+    void printDescription(){
+        System.out.println("I am a shape and my name is "+name);
+    }
+}
+
diff --git a/Week 4/ShapeManager.java b/Week 4/ShapeManager.java
new file mode 100644
index 0000000..a8f7ef0
--- /dev/null
+++ b/Week 4/ShapeManager.java	
@@ -0,0 +1,74 @@
+/**
+ *
+ * @author Bhaskar Tejaswi
+ */
+import java.util.Scanner;
+public class ShapeManager {
+   
+    public static void main(String[]args){
+        int choice;
+        Scanner sc = new Scanner(System.in);
+        ShapeManager myShapeManager = new ShapeManager();
+       
+         do {
+                System.out.println("Select a Shape");
+                System.out.println("1.Rectangle");
+                System.out.println("2.Square");
+                System.out.println("3.Circle");
+                System.out.println("4.Exit");
+                choice = sc.nextInt();
+
+        switch (choice)
+                        {
+                                case 1: 
+                                    System.out.println("Enter the length  :");
+                                    double len=sc.nextDouble();
+                                    System.out.println("Enter the breadth :");
+                                    double bd=sc.nextDouble();
+                                    if(len<=0 || bd<=0)
+                                    System.out.println("Invalid Entry");
+                                    else
+                                    {
+                                        Rectangle myRect = new Rectangle(len,bd);
+                                        myShapeManager.manageShape(myRect);
+                                    }
+                                break;
+                                   
+                                case 2: System.out.println("Enter the side length  :");
+                                        double side=sc.nextDouble();
+                                        if(side<=0)
+                                        System.out.println("Side must be positive");
+                                        else
+                                        {
+                                            Square mysq = new Square(side);
+                                            Rectangle myRect = (Rectangle)mysq;
+                                             myRect.printDescription();
+                                        }
+                                break;
+                                   
+                                case 3: System.out.println("Enter the radius  :");
+                                        double radius=sc.nextDouble();
+                                        if(radius<=0)
+                                         System.out.println("Invalid Entry");
+                                        else
+                                       {
+                                        Circle myCircle = new Circle(radius);
+                                        myShapeManager.manageShape(myCircle);
+                                       }
+                                break;
+                                   
+                                case 4: System.out.println("Program terminated.");
+                                break;
+                                   
+                                default: System.out.println("Invalid entry !");
+                                break;
+                        }
+               } while (choice != 4);
+    System.out.println("Thank You!");
+    }
+    void manageShape(Shape myShape) 
+   {
+    myShape.printDescription();
+
+}  
+}
\ No newline at end of file
diff --git a/Week 4/Square.java b/Week 4/Square.java
new file mode 100644
index 0000000..a209d3d
--- /dev/null
+++ b/Week 4/Square.java	
@@ -0,0 +1,19 @@
+
+
+/**
+ *
+ * @author Bhaskar Tejaswi
+ */
+public class Square extends Rectangle {
+  
+   Square(double side)
+    {
+            super(side, side);
+            System.out.println("Constructor of Square with parameters "+side);
+    }
+   
+     void printDescription(){
+        System.out.println("Side = "+length);
+        System.out.println("Area = "  +areaOf()+" sq units");    
+     }
+}
diff --git a/Week 4/Student.java b/Week 4/Student.java
new file mode 100644
index 0000000..cb12017
--- /dev/null
+++ b/Week 4/Student.java	
@@ -0,0 +1,17 @@
+/**
+ *
+ * @author Bhaskar Tejaswi
+ */
+public class Student extends Person{
+    public final String hobby= "surfing Facebook";
+    Student(String name)
+    {
+        super(name);
+    }
+    public void introduce(){
+        System.out.println("Hello my name is "+retName() +" and my hobby is "+hobby);
+    }
+    public void isReader(){
+        super.introduce();
+    }
+}
diff --git a/Week 4/StudentManager.java b/Week 4/StudentManager.java
new file mode 100644
index 0000000..a1ce050
--- /dev/null
+++ b/Week 4/StudentManager.java	
@@ -0,0 +1,35 @@
+/**
+ *
+ * @author Bhaskar Tejaswi
+ */
+import java.util.*;
+public class StudentManager {
+    public static void main(String[] args){
+        Scanner sc = new Scanner(System.in);
+        int choice;
+        CSEStudent Arif = new CSEStudent("Arif");
+         do {
+                System.out.println("Where is "+Arif.retName()+" ?");
+                System.out.println("1: At a get-together for student leaders");
+                System.out.println("2: At a closed-door Hacker Society meeting");
+                System.out.println("3: At his cousin's birthday party");
+                System.out.println("4: Quit");
+                choice = sc.nextInt();
+
+                switch (choice)
+                {
+                case 1: Arif.onFacebook();
+                break;
+                case 2: Arif.isHacker();
+                break;
+                case 3: Arif.isReader();
+                break;
+                case 4: System.out.println("Program terminated");
+                break;
+                default: System.out.println("Invalid choice");/* add error handling */
+                break;
+                }
+                    } while (choice != 4);
+         System.out.println("Thank You!");
+    }
+}