Given a 32-bit signed integer, reverse digits of an integer.
Example 1:
Input: 123
Output: 321
Example 2:
Input: -123
Output: -321
Example 3:
Input: 120
Output: 21
int reserve
除数模
class Solution {
/**
* @param Integer $x
* @return Integer
*/
function reverse($x) {
$y = $x > 0 ? $x : (-1) * $x;
$arr = array();
$res = 0;
while ($y) {
$num = $y % 10;
$y = intval($y / 10);
$arr[] = $num;
}
$count = count($arr) - 1;
foreach ($arr as $k => $v) {
$res += $v * pow(10, ($count - $k));
}
if($res > 2147483647){
$res = 0;
}
$res = $x > 0 ? $res : (-1) * $res;
return $res;
}
}
$class = new Solution();
$res = $class->reverse(123);
var_dump($res);
