What is Relay

In electrical term,
"Relay is an electromagnetic switch which is operated by current to make or break the circuit."
It is extensively used in industry to make or break the connections.

Relay

Where:
A & B terminals are relay inputs.
COM is common terminal of switch.
NC is normally open terminal of switch.
NO is normally close terminal of switch.

Example of HTML PHP Comment

Type the following code in your text editor..

<HTML>
<HEAD>
<TITLE>Example of Comments</TITLE>
</HEAD>
<BODY>
<!-- html comment style -->
<?
// This is a single line PHP comment style.
# Shell type comment style.
/* This is a C style comment, we can use it for multiple lines 
this is suitable for multiple line comment */
?>
</BODY>
</HTML>

Now save this file as comment.php

Comment in PHP

Various types of syntax are used  to add comment in PHP.

Syntax 1

// this is single line comment in php code.

Syntax 2

# this is another style of comment in php code called shell-style.

Syntax 3


/* this is C-style comment in php code used for upto two lines */

Syntax 4

<!   example of html comment which is ignored by browser  >

Print Quotient and Remainder in C++

// Write a C++ program that takes two values of x(dividend) and
// y(divisor) from user and prints quotient and remainder of x/y

#include<iostream.h>
#include<conio.h>
void main()
{
    clrscr();
    int x,y,q,r;
    cout<<"Enter dividend number x : ";
    cin>>x;
    cout<<"Enter divisor number y : ";
    cin>>y;

    cout<<"\n\n------------------------------------\n";
    cout<<" Quotient and Remainder of x/y \n";
    cout<<"------------------------------------\n";

    q = x / y ;
    r = x % y;
    cout<<"Quotient  = "<<q<<endl<<"Remainder = "<<r;
    getch();
}

PHP Start and End tags

There are three basic types of PHP Start and End tags which is also called PHP Opening and Closing tags respectively.

Figure: PHP Starting and Ending Tags

Examples:

You can use any type of php tag in your script.

<?
echo "<P>Example of 1st type of PHP tag.</P>";
?>

<?php
echo "<P>Example of 2nd type of PHP tag.</P>";
?>

<script language="php">
echo "<P>Example of 3rd type of PHP tag.</P>";
</script>

Even Numbers in Descending Order

// Write a C++ program that prints odd numbers in
// descending order from a given range.

#include<iostream.h>
#include<conio.h>
void main()
{
    clrscr();
    int i,n;
    cout<<"Enter any number : ";
    cin>>n;
   
    cout<<"\n\n------------------------------------\n";
    cout<<" Even numbers in Descending Order \n";
    cout<<"------------------------------------\n";

    if( n%2 != 0 )
    n--;
    for( i = n ; i >= 0 ; i = i-2 )
    cout<<"         "<<i<<endl;
    getch();
}

Even Numbers in Ascending Order

// Write a C++ program that prints even numbers in
// ascending order up to given range.


#include<iostream.h>
#include<conio.h>
void main()
{
    clrscr();
    int i,n;
    cout<<"Enter any number for ending range : ";
    cin>>n;
   
    cout<<"\n\n------------------------------------\n";
    cout<<" Even numbers in Ascending Order \n";
    cout<<"------------------------------------\n";

    for( i = 0 ; i <= n ; i = i+2 )
    cout<<"         "<<i<<endl;
    getch();
}