Home > Article > Backend Development > 4 examples of how to implement the number of narcissus in PHP. Number of narcissus within 1000. Number of narcissus in vb c language to output narcissus.
4 examples of how to implement the number of narcissus in PHP. Number of narcissus within 1000. Number of narcissus in vb c language to output narcissus.
- WBOYOriginal
- 2016-07-29 08:49:513664browse
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 mainly introduces 4 examples of how to implement narcissus number in PHP. Friends who need it can refer to it:
Example 1, the code is as follows:
<?php
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 "."<p>";
}
}
}
}
?>
Example 2, the code is as follows:
<?php
function cube( $n )
{
return $n * $n * $n;
}
function is_narcissistic ( $n )
{
$hundreds = floor( $n / 100); //分解出百位
$tens = floor( $n / 10 ) % 10; //分解出十位
$ones = floor( $n % 10 ); //分解出个位
return (bool)(cube($hundreds)+cube($tens)+cube($ones) == $n);
}
for ( $i = 100; $i < 1000; ++ $i )
{
if ( is_narcissistic($i) )
echo $i."\n";
}
?> Example 3, the code is as follows:
<?php
//阿姆斯特朗数：一个k位数，它的每个位上的数字的k次幂之和等于它本身。（例如：1^3 + 5^3 + 3^3 = 153）
class Armstrong {
static function index(){
for ( $i = 100; $i < 100000; $i++ ) {
echo self::is_armstrong($i) ? $i . '<br>' : '';
}
}
static function is_armstrong($num){
$s = 0;
$k = strlen($num);
$d = str_split($num);
foreach ($d as $r) {
$s += bcpow($r, $k);
}
return $num == $s;
}
}
Armstrong::index();
Example 4, the code is as follows:
<html>
<head>
<title></title>
</head>
<body>
<?php
function winter($num)
{
if($num<1000){
//定义个位
$ge=$num%10;
//定义十位
$ten=(($num%100)-$ge) /10;
//定义百位
/*floor取整，忽略小数点后面的所有数*/
$hundred=floor($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 "大于1000的数";
}else{
if(winter(371)) {
echo "Yes";
}
else{
echo "No";
}
}
?>
</body>
</html>
The above introduces 4 examples of how to implement the daffodil number in PHP, including the narcissus number and PHP content. I hope it will be helpful to friends who are interested in PHP tutorials.