4 examples of php implementation of narcissus number

What is the Narcissus Number?

Daffodil number refers to an n-digit number (n≥3), the sum of the nth power of the digits in each digit is equal to itself. (For example: 1^3 + 3^3+ 5^3 = 153), this article collects 4 examples of php implementing narcissus number.

Example 1, php implements the number of daffodils:

for($q=1;$q<=9;$q++){
 for($w=0;$w<=9;$w++){
 for($ e=0;$e<=9;$e++){
 if($q*$q*$q + $w*$w*$w + $e*$e*$e ==
 100*$q + 10*$w + $e){
 echo "$q $w $e "."";
 }
 }
 }
}
?>

Example 2. PHP implements the number of daffodils:

function cube( $n )
{
 return $n * $n * $n;
}
function is_narcissistic ( $n )
{
 $hundreds = floor( $n / 100); //Decompose the hundreds place
 $tens = floor( $n / 10 ) % 10; //Decompose the tens place
 $ones = floor( $ n % 10 ); //Decompose the units digit
 return (bool)(cube($hundreds)+cube($tens)+cube($ones) == $n);
}
for ( $i = 100; $i < 1000; ++ $i )
{
 if ( is_narcissistic($i) )
 echo $i."n";
}
?>

Example 3, php implements the number of daffodils:

//Armstrong number: a k-digit number, the sum of the k-th power of the numbers in each digit is equal to itself. (Example: 1^3 + 5^3 + 3^3 = 153)
class Armstrong {
 static function index(){
 for ( $i = 100; $i < 100000; $i++ ) {
 echo self: :is_armstrong($i) ? $i . '' : '';
 }
 }
 static function is_armstrong($num){
 $s = 0;
 $k = strlen($num);
 $d = str_split($num);
 foreach ($d as $r) {
 $s += bcpow($r, $k);
 }
 return $num == $s;
 }
}
Armstrong ::index();

Example 4, PHP implements daffodil number:

 ;?php
 function winter($num)
 {
 if($num<1000){
 //Define the ones digit
 $ge=$num%10;
 //Define the tens digit
 $ten=(($num %100)-$ge) /10;
 //Define hundreds place
 /*floor rounding, ignore all numbers after the decimal point*/
 $hundred=floor($num/100);
 $sum1=$ge* $ge*$ge+$ten*$ten*$ten+$hundred*$hundred*$hundred;
 if($sum1==$num){
 return 1;
 } else{
 return 0;
 }
 } else {
 return -1;
 }
 }
 if(winter(371)==-1) {
 echo "A number greater than 1000";
 }else{
 if(winter(371)) {
 echo "Yes" ;
 }
 else{
 echo "No";
 }
 }
?>




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