ESc101 Laboratory Assignment 
	        	 Monday of Week of 1/11/04

The assignment consists of two parts A and B. In part A, you have to run the programs 
given and give explanation for the results obtained. In part B you have to write a 
Java Program.

=======
PART A 
=======

1)
	class A
	{
	    private int i,j;
	
		  A(int x, int y)
		  {
			i = x;
			j = y;
		  }
		  A()
		  {
			i = 0;
			j = 0;
		  }
		  void setA(int x, int y)
		  {
			i = x;
			j = y;
		  } 
		  int getAi()
		  {
			return i;
		  }
		  int getAj()
		  {
			return j;
		  }
			
	}


	class B extends A
	{
	    private int total;
	    	
		  B()
		  {
			total = 0;
		  }
		  void setTotal()
		  {
			total = i + j;
		  } 
		  int getTotal()
		  {
			return total;
		  }
	}


	class prog1
	{
		public static void main(String args[])
		{	
			B obj = new B();
			obj.setTotal();
			System.out.println("\n Value of total = " + obj.getTotal());
		}				
	}

------------------------------------------------------------------------------

2)

	class A
	{
	    private int i,j;
	
	    	
		  A(int x, int y)
		  {
			i = x;
			j = y;
		  }
		  A()
		  {
			i = 0;
			j = 0;
		  }
		  void setA(int x, int y)
		  {
			i = x;
			j = y;
		  } 
		  int getAi()
		  {
			return i;
		  }
		  int getAj()
		  {
			return j;
		  }
			
	}


	class B extends A
	{
	    private int total;
	    	
		  B()
		  {
			super();
			total = 0;
		  }
		  B(int x, int y)
		  {
			super(x,y);
			total = 0;

                  }
		  void setTotal()
		  {
			total = getAi() + getAj();
		  } 
		  int getTotal()
		  {
			return total;
		  }
	}


	class prog2
	{
		public static void main(String args[])
		{	
			B obj = new B(10,15);
			obj.setTotal();
			System.out.println("\n Value of total = " + obj.getTotal());
		}				
	}

----------------------------------------------------------------------

3) 
	class superclass
	{
		int i;
	     	
	     void calc(int x)
		 {
			System.out.println("\n The value = " + (x+i));
		 } 
		  
		 int getsuperi()
		 {
			return i;
		 }
		 void setsuperi(int x)
		 {
			i = x;
		 }
			
	}


	class subclass extends superclass
	{
		
	 	  int i;

		  void calc(int x)
		  {
			System.out.println("\n The value = " + (super.i + i + x));	
		  }
		  void calc(float x)
		  {
		  	System.out.println("\n The value = " + (super.i * x + i));
		  } 
		  int geti()
		  {
			return i;
		  }
		  void seti(int x)
		  {
			i = x;			
		  }
	}


	class prog3
	{
		public static void main(String args[])
		{	
			subclass ob = new subclass();
			ob.seti(20);
			ob.setsuperi(35);
			superclass sup_obj = ob;
			sup_obj.calc(10);
			superclass obj2 = new superclass();
			obj2.calc(4);
		}				
	}

--------------------------------------------------------------------

4)

	Add the following statement to the main function in the above program 
        after the last statement. Run the program and justify the outcome.
	                sup_obj.calc((float)4.0);


==================================================================================

PART B
=======

Write a program with four classes. Student, Undergraduate, PostGraduate, and 
ProgramClass. The classes Undergraduate and Postgraduate are sub classes of class 
Student. 

The class Student has name, marks, and grade as member data and a member function 
ComputeGrade(). The function ComputeGrade is overridden in classes Undergraduate and 
Postgraduate. It calculates the grade for the student depending on marks and prints 
out the grade.

In the ProgramClass, write code to take the marks and names of 10 students as input 
from the user and information about whether the student is an  Undergraduate Student 
or a Postgraduate Student, create respective objects, and save them in a single array.  

Then, compute and print the appropriate grade for the students using a loop
statement. 

The criteria for calculating the grade for Student is : 
		marks>=50 ==> A
		marks>=40 ==> B	
		marks>=30 ==> C
		marks>=20 ==> D
		marks<20 ==> F

The criteria for calculating the grade for Undergraduate Student is : 
		marks>=70 ==> A
		marks>=60 ==> B	
		marks>=40 ==> C
		marks>=30 ==> D
		marks<30 ==> F

The criteria for calculating the grade for Postgraduate Student is : 
		marks>=80 ==> A
		marks>=70 ==> B	
		marks>=50 ==> C
		marks>=40 ==> D
		marks<30 ==> F