CJ-26 : Student Details[Inheritance(1)]

Type the programs in NOTEPAD or DOS prompt itself, for Consol Application.
Type in NETBEANS or ECLIPSE for Window Application.
Here after , I am just typing the programs only..to know more about it , refer

Introduction to JAVA 

before doing any JAVA Programs.

***********************************************************************************************

Refer Program to enter Student Details  , Enter student details using 2 functions also.

***********************************************************************************************

import java.io.*;

public class student 

{

int regno;

String name,grade,branch;

void read()

{

DataInputStream x=new DataInputStream(System.in);

try

{

System.out.println("Enter register number :");

regno=Integer.parseInt(x.readLine());

System.out.println("Enter student name :");

name=x.readLine();

System.out.println("Enter branch :");

branch=x.readLine();

System.out.println("Enter Grade :");

grade=x.readLine();

}

catch(Exception e)

{

}

}

}

class office extends student

{

int deptno;

void display()

{

DataInputStream x=new DataInputStream(System.in);

try

{

System.out.println("Enter department number :");

deptno=Integer.parseInt(x.readLine());

}

catch(Exception e)

{

}

System.out.println("Name ="+name);

System.out.println("Branch ="+branch);

System.out.println("Grade ="+grade);

System.out.println("Department Number ="+deptno);

}

}

class inherit

{

public static void main(String[] args) 

{

office s1=new office();

s1.read();

s1.display();

}

}

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

Predict the output...OK???

CPP-1 : First Program to display a message

• Compile the program using AltF9 , and then run the program using ControlF9.

  Save the file as name.CPP .That is , name of the file , followed by .CPP(dot CPP).

  Here I named the program "Firstprgrm." So, save it as Firstprgrm.CPP.

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

  
  

  #include<iostream.h>

  #include<conio.h>

  void main()

  {

  clrscr();

  cout<<"My first C++ Program";

  getch();

  }

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

  Output : 
  My first C++ Program
  
  

CJ-25 : Addition using constructors

Type the programs in NOTEPAD or DOS prompt itself, for Consol Application.
Type in NETBEANS or ECLIPSE for Window Application.
Here after , I am just typing the programs only..to know more about it , refer

Introduction to JAVA 

before doing any JAVA Programs.

*********************************************************************************************

Refer Sum(predefined values) and Sum(user defined values) also.

Next chapter CJ-26 : Accept Radius in meter

*********************************************************************************************

import java.io.*;

class add

{

    int a,b,c;

    add()

    {

    }

    add(int x,int y)

    {

            a=x;

            b=y;

            c=a+b;

            System.out.println("Addition ="+c);

    }

 }

class sub

{

    int n,m,s;

    sub()

    {

    }

    sub(int h,int j)

    {

        n=h;

        m=j;

        s=n-m;

        System.out.println("Subtraction ="+s);

    }

}

public class con1 

{

    public static void main(String args[])

    {

        add a=new add(10,20);

        sub b=new sub(60,20);

    }   

}

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

Output : 

Addition =30

Subtraction =40

CJ-24 : Enter student details using 2 functions

Type the programs in NOTEPAD or DOS prompt itself, for Consol Application.
Type in NETBEANS or ECLIPSE for Window Application.
Here after , I am just typing the programs only..to know more about it , refer

Introduction to JAVA 

before doing any JAVA Programs.

***********************************************************************************************

Refer Program to enter Student Details also.
***********************************************************************************************

import java.io.*;
class student1
{
    int rno;
    String name, branch;  
    void get()
    {
     
        try {
            DataInputStream x = new DataInputStream(System.in);
            System.out.println("Enter Roll Number");
            rno = Integer.parseInt(x.readLine());
            System.out.println("Enter Name");
            name = x.readLine();
            System.out.println("Enter Branch");
            branch = x.readLine();
        } catch (Exception e) {
           
        }
    }

    void display() {
        System.out.println(" ");
        System.out.println("=========================");
        System.out.println("STUDENT DETAILS :");
        System.out.println("-----------------");
        System.out.println("Roll Number =" + rno);
        System.out.println("Name =" + name);
        System.out.println("Branch =" + branch);
    }
}


    class exam
    {

        int regno, mark;

        void read() {
            try {
                DataInputStream x = new DataInputStream(System.in);
                System.out.println("Enter Register Number");
                regno = Integer.parseInt(x.readLine());
                System.out.println("Enter mark");
                mark = Integer.parseInt(x.readLine());
            } catch (Exception e) {
               
            }
        }

        void write() {
            System.out.println("=========================");
            System.out.println("EXAM DETAILS :");
            System.out.println("--------------");
            System.out.println("Register Number =" + regno);
            System.out.println("Mark =" + mark);
        }
    }
 

        class main1
        {

            public static void main(String args[]) {
                student1 s = new student1();
                exam e = new exam();
                s.get();
                e.read();
                s.display();
                e.write();

            }
     
    }

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

Output : 

Enter Roll Number
1
Enter Name
Priyada
Enter Branch
Computer Science
Enter Register Number
746092
Enter mark
500
 =========================
STUDENT DETAILS :
-----------------
Roll Number =1
Name =Priyada
Branch =Computer Science
=========================
EXAM DETAILS :
--------------
Register Number =746092
Mark =500

CJ-23 : Run-time error in Java

Type the programs in NOTEPAD or DOS prompt itself, for Consol Application.
Type in NETBEANS or ECLIPSE for Window Application.
Here after , I am just typing the programs only..to know more about it , refer

Introduction to JAVA 

before doing any JAVA Programs.

***********************************************************************************************

import java.io.*;
public class error
{
    public static void main(String args[])
    {
            int a[]={5,10};
            int b=5;
            try
            {
                int x=a[2]/b-a[1];
            }
            catch(ArithmeticException e)
            {
                System.out.println("Division by zero");
            }
            catch(ArrayIndexOutOfBoundsException e)
            {
               System.out.println("Array Index error"); 
            }
            catch(ArrayStoreException e)
            {
                System.out.println("Wrong data type");   
            }
            
            int y=a[1]/a[0];
            System.out.println("y ="+y);  
     }
    }

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

Output : 

Array Index error
y =2
========================================================================
Note : 
Given that,  int a[]={5,10}; 
That is , a[0]=5 and a[1]=10.

According to the formula given in the program , int x=a[2]/b-a[1];
But, there is no element in a[2].
So, the run-time error occured, and the println statement Array Index error displayed.

Then the program will end there and begin with the next catch statement  int y=a[1]/a[0];
That is , a[0]=5 and a[1]=10. And the result is 2.
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