Armstrong Number
Armstrong Number
An Armstrong number is the one whose value is equal to the sum of the cubes of its digits.
0, 1, 153, 371, 407, 471, etc are Armstrong numbers.
For example,
407 = (4*4*4) + (0*0*0) + (7*7*7)
= 64 + 0 + 343
407 = 407 
<?php
$num=407;
$total=0;
$x=$num;
while($x!=0)
{
$rem=$x%10;
$total=$total+$rem*$rem*$rem;
$x=$x/10;
}
if($num==$total)
{
echo "Yes it is an Armstrong number";
}
else
{
echo "No it is not an armstrong number";
}
?> 
<html>
<body>
<form method="post">
Enter the Number:
<input type="number" name="number">
<input type="submit" value="Submit">
</form>
</body>
</html>
<?php
if($_POST)
{
//get the number entered
$number = $_POST['number'];
//store entered number in a variable
$a = $number;
$sum = 0;
//run loop till the quotient is 0
while( $a != 0 )
{
$rem = $a % 10; //find reminder
$sum = $sum + ( $rem * $rem * $rem ); //cube the reminder and add it to the sum variable till the loop ends
$a = $a / 10; //find quotient. if 0 then loop again
}
//if the entered number and $sum value matches then it is an armstrong number
if( $number == $sum )
{
echo "Yes $number an Armstrong Number";
}else
{
echo "$number is not an Armstrong Number";
}
}
?> 