How to implement php integer inversion
This article will explain in detail how to achieve php integer inversion, the content of the article is of high quality, so the editor will share it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.
Php to achieve integer inversion methods: 1, to create a PHP example file; 2, through the "function reverse ($x) {...}" method to achieve integer inversion.
The operating environment of this paper: Windows7 system, PHP7.1, Dell G3.
How to implement php integer inversion?
Integer inversion of PHP algorithm
Given a 32-bit signed integer, you need to reverse the number on each of the integer.
Example 1:
Enter: 123
Output: 321
Example 2:
Enter:-123
Output:-321
Example 3:
Input: 120
Output: 21
Note:
Assuming that our environment can only store 32-bit signed integers, the range of values is [− 231,231 − 1]. Based on this assumption, 0 is returned if the integer overflows after the inversion.
Class Solution {/ * @ param Integer $x * @ return Integer * / function reverse ($x) {$max = pow (2mai 31)-1; $min = pow (- 2ME 31); $strlen = strlen ($x); if ($x > = 0) {$num = (int) strrev ($x) } else {$num ='-'. (int) strrev (trim);} if ($min < $num & & $num < $max) {return $num;} else {return 0;}
On how to achieve php integer inversion to share here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.
