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,

Logic:

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Armstrong number in PHP

Below program checks whether 407 is Armstrong or not.

Example:

Output:

Look at the above snapshot, the output displays that 407 is an Armstrong number.

A number is Armstrong or can also be checked using a form.

Example:

<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";
}
}
?>