Coding to swap two variables without using third variable

swap two variables without using third variable

a=a+b;
b=a-b;
a=a-b;

Program for Queue implementation through Array in C language

Program for Queue implementation through Array in C language

#include "stdio.h"
#include "ctype.h"
# define MAXSIZE 200

int q[MAXSIZE];
int front, rear;
void main()
{
void add(int);
int del();
int will=1,i,num;
front =0;
rear = 0;

clrscr();

printf("Program for queue demonstration through array");

while(will ==1)
{
printf("
MAIN MENU:
1.Add element to queue
2.Delete element from the queue
");
scanf("%d",&will);

switch(will)
{
case 1:
printf("
Enter the data... ");
scanf("%d",&num);
add(num);
break;
case 2: i=del();
printf("
Value returned from delete function is %d ",i);
break;
default: printf("Invalid Choice ... ");
}

printf("

Do you want to do more operations on Queue ( 1 for yes, any other key to exit) ");
scanf("%d" , &will);
} //end of outer while
} //end of main

void add(int a)
{

if(rear>MAXSIZE)
{
printf("

QUEUE FULL

");
return;
}
else
{
q[rear]=a;
rear++;
printf("
Value of rear = %d and the value of front is %d",rear,front);
}
}

int del()
{
int a;
if(front == rear)
{
printf("QUEUE EMPTY");
return(0);
}
else
{
a=q[front];
front++;
}
return(a);
}

Stack Coding in C language

Program for Stack implementation through Array in C language

#include "stdio.h"
#include"ctype.h"
# define MAXSIZE 200

int stack[MAXSIZE];
int top; //index pointing to the top of stack
void main()
{
void push(int);
int pop();
int will=1,i,num;
clrscr();

while(will ==1)
{
printf("
MAIN MENU:
1.Add element to stack
2.Delete element from the stack
");
scanf("%d",&will);

switch(will)
{
case 1:
printf("
Enter the data... ");
scanf("%d",&num);
push(num);
break;
case 2: i=pop();
printf("
Value returned from pop function is %d ",i);
break;
default: printf("Invalid Choice . ");
}

printf(" Do you want to do more operations on Stack ( 1 for yes, any other key to exit) ");
scanf("%d" , &will);
} //end of outer while
} //end of main


void push(int y)
{

if(top>MAXSIZE)
{
printf(" STACK FULL");
return;
}
else
{
top++;
stack[top]=y;
}
}

int pop()
{
int a;
if(top<=0)
{
printf(" STACK EMPTY ");
return 0;
}
else
{
a=stack[top];
top--;
}
return(a);

}

Vb.net Connectivity using ADO.NET - Updating Record royalarun.blogspot.com

Vb.net Connectivity using ADO.NET - Updating Record

Updating Records

We will update a row in Authors table. Drag a button onto the form and place the following code.

Imports System.Data.SqlClient
Public Class Form4 Inherits System.Windows.Forms.Form
Dim myConnection As SqlConnection
Dim myCommand As SqlCommand
Dim ra as Integer
Private Sub Form4_Load(ByVal sender As System.Object, ByVal e_
As System.EventArgs) Handles MyBase.Load
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e_
As System.EventArgs) Handles Button1.Click
myConnection = New SqlConnection("server=localhost;uid=sa;pwd=;database=pubs")
'you need to provide password for sql server
myConnection.Open()
myCommand = New SqlCommand("Update Authors Set city='Oakland' where city=_
'San Jose' ",myConnection)
ra=myCommand.ExecuteNonQuery()
MessageBox.Show("Records affected" & ra)
myConnection.Close()
End Sub
End Class

//royalarun.blogspot.com

Vb.net Connectivity using ADO.NET - Deleting Record royalarun.blogspot.com

Vb.net Connectivity using ADO.NET - Deleting Record
Deleting a Record

We will use Authors table in Pubs sample database to work with this code. Drag a button onto the form and place the following code.

Imports System.Data.SqlClient
Public Class Form3 Inherits System.Windows.Forms.Form
Dim myConnection As SqlConnection
Dim myCommand As SqlCommand
Dim ra as Integer
Private Sub Form3_Load(ByVal sender As System.Object, ByVal e_
As System.EventArgs) Handles MyBase.Load
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e_
As System.EventArgs) Handles Button1.Click
myConnection = New SqlConnection("server=localhost;uid=sa;pwd=;database=pubs")
'you need to provide password for sql server
myConnection.Open()
myCommand = New SqlCommand("Delete from Authors where city='Oakland'",_
myConnection)
'since no value is returned we use ExecuteNonQuery
ra=myCommand.ExecuteNonQuery()
MessageBox.Show("Records affected" & ra)
myConnection.Close()
End Sub
End Class

Vb.net Connectivity using ADO.NET- Inserting Record royalarun.blogspot.com

Vb.net Connectivity using ADO.NET- Inserting Record

Using DataReaders, SQL Server

Inserting Records

The following code inserts a Record into the Jobs table in Pubs sample database. Drag a button onto the form and place the following code.

Imports System.Data.SqlClient
Public Class Form2 Inherits System.Windows.Forms.Form
Dim myConnection As SqlConnection
Dim myCommand As SqlCommand
Dim ra as Integer
'integer holds the number of records inserted
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e_
As System.EventArgs) Handles MyBase.Load
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e_
As System.EventArgs) Handles Button1.Click
myConnection = New SqlConnection("server=localhost;uid=sa;pwd=;database=pubs")
'you need to provide password for sql server
myConnection.Open()
myCommand = New SqlCommand("Insert into Jobs values 12,'IT Manager',100,300,_
myConnection)
ra=myCommand.ExecuteNonQuery()
MessageBox.Show("New Row Inserted" & ra)
myConnection.Close()
End Sub
End Class