array insertion deletion using c++

                                                                                                   edited by:: Subhrajit Gorai
                                                                                                                      CMSA 1st sem


source code::

#include<iostream>

#include<conio.h>

using namespace std;

class Array{

                int arr[100],l,e,n;

                public:  

                                void input(){

                                cout<<"Enter the length of the array :";

                                cin>>l;  

                                cout<<"Enter the elements of the array :\n";

                                for(int i=0;i<l;i++)

                                cin>>arr[i];

                                }

                               

                                void output(){

                                cout<<"\nThe elements of the array :\n";

                                for(int i=0;i<l;i++)

                                                cout<<arr[i]<<" , ";

                }

                                               

                void insert_At_Begin(){

                                                cout<<"\nEnter the elements to be inserted in the array :\n";

                                                cin>>e;

                                                l++;

                                                for(int i=l-2;i>=0;i--){

                                                                arr[i+1]=arr[i];

                                                }

                                                arr[0]=e;

                                                output();

                                }

               

                void del_At_Begin(){

                                l--;

                                for(int i=0;i<l;i++)

                                                arr[i]=arr[i+1];

                                                output();

                                }

               

                void insert_At_End(){

                                cout<<"\nEnter the elements to be inserted in the array :\n";

                                cin>>e;

                                l++;

                                arr[l-1]=e;

                                output();

                }

               

                void del_At_End(){

                                                l--;

                                                output();

                }

               

                void insert_At_Index(){

                                                cout<<"Enter the position of the array where the element is to be inserted :";

                                                cin>>n;

                                                while(n>l||n<0){

                                                cout<<"\nINVALID POSITION entered........!!!!";

                                                cout<<"\nEnter the position of the array where the element is to be AGAIN :";

                                                cin>>n;

                                                }

                                                cout<<"\nEnter the elements to be inserted in the array :\n";

                                                cin>>e;

                                                l++;

                                                --n;

                                                for(int i=l-2;i>=n;i--){

                                                                arr[i+1]=arr[i];

                                                }

                                                arr[n]=e;

                                                output();

                                }

               

               

                void del_At_Index(){

                                cout<<"\nEnter the position of the array where the element is to be Deleted :";

                                cin>>n;

                                while(n>l||n<0){

                                                cout<<"\nINVALID POSITION entered........!!!!";

                                                cout<<"\nEnter the position of the array where the element is to be AGAIN :";

                                                cin>>n;

                                }

                                n=n-1;

                                                for(int i=n;i<l;i++)

                                                                arr[i]=arr[i+1];

                                l--;

                                output();

                }

               

                void cho(){

                                int c;

                                cout<<"\n\n  1. Insert Element at the Begining.\n  2. Insert Element at the End.\n  3. Insert Element at any desired position.\n  4. Delete Element at the Begining.\n  5. Delete Element at the End.\n  6. Delete Element at any desired position.\n  7. Exit\n";

                                cout<<"\nEnter the choice:";

                                                cin>>c;

                                                switch (c)

                                                {

                                                case 1:

                                                                insert_At_Begin();

                                                                 break; 

                                                case 2:

                                                                insert_At_End();

                                                                 break; 

                                                case 3:

                                                                insert_At_Index();

                                                                 break; 

                                                case 4:

                                                                del_At_Begin();

                                                                 break; 

                                                case 5: 

                                                                del_At_End();

                                                                   break;                               

                                                case 6:

                                                                del_At_Index();

                                                                 break; 

                                                case 7: exit(0);                  

                                                default :cout<<" Wrong Choice!!!!\n Enter the choice Again.... ";

                                                                                 cho();

                                                }

                }

};

                int main(){

                                int s=0;

                                Array ob;

                                ob.input();

                                ob.output();

                                for(int k=0;;k++)

                                ob.cho();

                                getch();

                                return 0;

}                                             

output::

basic operator in vb6

Private Sub Form_Load()
Dim a, b, c, d, e, f As Integer
a = 5
b = 4
c = a + b

d = a - b

e = a * b

f = a / b

MsgBox ("sum=" & c & vbCrLf & "differnce=" & d & vbCrLf & "multiplication=" & e & vbCrLf & "division=" & f)


End Sub


output

synchronization

class PrintTable{ 
//synchronized method.
    public synchronized void printTable(int n){
       System.out.println("Table of " + n);
       for(int i=1;i<=10;i++){
           System.out.println(n*i);
           try{
        Thread.sleep(500);
           }catch(Exception e){
        System.out.println(e);
           }
        }     
    }
}

class MyThread1 extends Thread{
    PrintTable pt;
    MyThread1(PrintTable pt){
    this.pt=pt;
    }
    public void run(){
    pt.printTable(2);
    }     
}

class MyThread2 extends Thread{
PrintTable pt;
MyThread2(PrintTable pt){
this.pt=pt;
}
public void run(){
pt.printTable(5);
}
}

public class p1{
    public static void main(String args[]){
    //creating PrintTable object.
    PrintTable obj = new PrintTable();

    //creating threads.
    MyThread1 t1=new MyThread1(obj);
    MyThread2 t2=new MyThread2(obj);

    //start threads.
    t1.start();
    t2.start();
    }
}



C:\Users\Com science\Documents>java p1
Table of 2
2
4
6
8
10
12
14
16
18
20
Table of 5
5
10
15
20
25
30
35
40
45
50

C:\Users\Com science\Documents>

with out synchronization

class PrintTable{   
    public void printTable(int n){
      // synchronized(this){
       System.out.println("Table of " + n);
           for(int i=1;i<=10;i++){
               System.out.println(n*i); 
               try{ 
            Thread.sleep(500); 
               }catch(Exception e){
            System.out.println(e);
               } 
            }
       //}           
    } 
} 

class MyThread1 extends Thread{ 
    PrintTable pt; 
    MyThread1(PrintTable pt){ 
    this.pt=pt; 
    } 
    public void run(){
    pt.printTable(2); 
    }       
} 

class MyThread2 extends Thread{ 
PrintTable pt; 
MyThread2(PrintTable pt){ 
this.pt=pt; 
} 
public void run(){ 
pt.printTable(5); 
} 
} 

public class p1{ 
    public static void main(String args[]){
    //creating PrintTable object.
    PrintTable obj = new PrintTable(); 

    //creating threads.
    MyThread1 t1=new MyThread1(obj); 
    MyThread2 t2=new MyThread2(obj); 

    //start threads.
    t1.start(); 
    t2.start(); 
    } 
}



C:\Users\Com science\Documents>java p1
Table of 5
5
Table of 2
2
4
10
6
15
20
8
10
25
12
30
35
14
16
40
45
18
50
20

C:\Users\Com science\Documents>

synchronization

class PrintTable{   
    public void printTable(int n){
       synchronized(this){
       System.out.println("Table of " + n);
           for(int i=1;i<=10;i++){
               System.out.println(n*i); 
               try{ 
            Thread.sleep(500); 
               }catch(Exception e){
            System.out.println(e);
               } 
            }
       }           
    } 
} 

class MyThread1 extends Thread{ 
    PrintTable pt; 
    MyThread1(PrintTable pt){ 
    this.pt=pt; 
    } 
    public void run(){
    pt.printTable(2); 
    }       
} 

class MyThread2 extends Thread{ 
PrintTable pt; 
MyThread2(PrintTable pt){ 
this.pt=pt; 
} 
public void run(){ 
pt.printTable(5); 
} 
} 

public class p1{ 
    public static void main(String args[]){
    //creating PrintTable object.
    PrintTable obj = new PrintTable(); 

    //creating threads.
    MyThread1 t1=new MyThread1(obj); 
    MyThread2 t2=new MyThread2(obj); 

    //start threads.
    t1.start(); 
    t2.start(); 
    } 
}



C:\Users\Com science\Documents>java p1
Table of 2
2
4
6
8
10
12
14
16
18
20
Table of 5
5
10
15
20
25
30
35
40
45
50

C:\Users\Com science\Documents>

nested try

import java.util.*;
public class p1 {
    public static void main(String[] args) {
        try {
            System.out.println("Outer try block starts");
            try {
                System.out.println("Inner try block starts");
                int res = 5 / 0;
            } catch (InputMismatchException e) {
          System.out.println("InputMismatchException caught");
            } finally {
                System.out.println("Inner final");
            }
        } catch (ArithmeticException e) {
            System.out.println("ArithmeticException caught");
        } finally {
            System.out.println("Outer finally");
        }
    }
}






C:\Users\Com science\Documents>java p1
Outer try block starts
Inner try block starts
Inner final
ArithmeticException caught
Outer finally

C:\Users\Com science\Documents>

text box and command button

import java.awt.*;
import java.awt.event.*;
class p1 extends Frame implements ActionListener{
TextField tf;
p1(){

tf=new TextField();
tf.setBounds(60,50,170,20);
Button b=new Button("click me");
b.setBounds(100,120,80,30);


b.addActionListener(this);


add(b);add(tf);
setSize(300,300);
setLayout(null);
setVisible(true);
}
public void actionPerformed(ActionEvent e){
tf.setText("Welcome");
}
public static void main(String args[]){
new p1();
}
}

event handling

 1. text box & command button -- LINK
 2. BASIC INTRODUCTION LINK LINK2

3. keyboard  handling -- link
4. mouse handling -- link

keyboard handling

1.
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
<applet code="Key" width=300 height=400>
</applet>
*/
public class Key extends Applet
implements KeyListener
{
int X=20,Y=30;
String msg="KeyEvents--->";
public void init()
{
addKeyListener(this);
requestFocus();
setBackground(Color.green);
setForeground(Color.blue);
}
public void keyPressed(KeyEvent k)
{
showStatus("KeyDown");
int key=k.getKeyCode();
switch(key)
{
case KeyEvent.VK_UP:
showStatus("Move to Up");
break;
case KeyEvent.VK_DOWN:
showStatus("Move to Down");
break;
case KeyEvent.VK_LEFT:
showStatus("Move to Left");
break;
case KeyEvent.VK_RIGHT:
showStatus("Move to Right");
break;
}
repaint();
}
public void keyReleased(KeyEvent k)
{
showStatus("Key Up");
}
public void keyTyped(KeyEvent k)
{
msg+=k.getKeyChar();
repaint();
}
public void paint(Graphics g)
{
g.drawString(msg,X,Y);
}
}

<applet code="Key" width=200 height=60>

</applet>

Example2:


import java.awt.*;

import java.applet.*;



public class Key1 extends Applet

{

    int keyPressed;



    public void init()

    {

        keyPressed = -1;



        Font font =  new Font("TimesRoman", Font.BOLD, 144);

        setFont(font);



        resize(200, 200);

    }



    public void paint(Graphics g)

    {

        String str = "";



        if (keyPressed != -1)

        {

            str += (char)keyPressed;

            g.drawString(str, 40, 150);

        }

    }



    public boolean keyDown(Event evt, int key)

    {

        keyPressed = key;

        repaint();

        return true;

    }

}

<applet code="Key1" width=200 height=60>
</applet>

mouse handling

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
<applet code="Mouse" width=500 height=500>
</applet>
*/
public class Mouse extends Applet
implements MouseListener,MouseMotionListener
{
int X=0,Y=20;
String msg="MouseEvents";
public void init()
{
addMouseListener(this);
addMouseMotionListener(this);
setBackground(Color.black);
setForeground(Color.red);
}
public void mouseEntered(MouseEvent m)
{
setBackground(Color.magenta);
showStatus("Mouse Entered");
repaint();
}
public void mouseExited(MouseEvent m)
{
setBackground(Color.black);
showStatus("Mouse Exited");
repaint();
}
public void mousePressed(MouseEvent m)
{
X=10;
Y=20;
msg="mouse pressed";
setBackground(Color.green);
repaint();
}
public void mouseReleased(MouseEvent m)
{
X=10;
Y=20;
msg="mouse released";
setBackground(Color.blue);
repaint();
}
public void mouseMoved(MouseEvent m)
{
X=m.getX();
Y=m.getY();
msg="mouse moved";
setBackground(Color.white);
showStatus("Mouse Moved");
repaint();
}
public void mouseDragged(MouseEvent m)
{
msg="mouse dragged";
setBackground(Color.yellow);
showStatus("Mouse Moved"+m.getX()+" "+m.getY());
repaint();
}
public void mouseClicked(MouseEvent m)
{
msg="mouse clicked";
setBackground(Color.pink);
showStatus("Mouse Clicked");
repaint();
}
public void paint(Graphics g)
{
g.drawString(msg,X,Y);
}
}

mouse.html

<applet code="Mouse" width=200 height=60>

</applet>