Question

How to check if a number is armstrong number or not in PHP

Answer 1

// An Armstrong number of three digits is an integer that the sum 
// of the cubes of its digits is equal to the number itself
   
// 371 is an Armstrong number: 3**3 + 7**3 + 1**3 = 371
   
$n = 371;
$sum = 0;
       
$tmp = $n;
       
while ($n != 0)
{
    $reminder = $n % 10;
    $n = (int)($n / 10);
    $sum = $sum + ($reminder * $reminder * $reminder);
}
if ($sum == $tmp)
    echo $tmp . " is an Armstrong number <br />";
else
    echo $tmp . " is not an Armstrong number <br />";
  
/*
run:
  
371 is an Armstrong number 
   
*/

 

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