PHP Program to Swap with XOR with Explanation
PHP
Medium
PHP Operators
31 views
1 min read
81 words
This problem helps you practice core PHP fundamentals in a practical way. It builds intuition around swap, xor, one. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Swap two integers using XOR and print them.
Input Format
One line: a b.
Output Format
One line: swapped_a swapped_b.
Constraints
0
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
<?php
$inputText=trim(stream_get_contents(STDIN));
if($inputText==='') exit;
[$a,$b]=array_map('intval',preg_split('/\\s+/', $inputText));
$a=$a^$b; $b=$a^$b; $a=$a^$b;
echo $a.' '.$b;
?>
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Solution Guide
Problem
Swap two integers using XOR and print them.
Input / Output
Output
One line: swapped_a swapped_b.
Details
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Official Solution
<?php
$inputText=trim(stream_get_contents(STDIN));
if($inputText==='') exit;
[$a,$b]=array_map('intval',preg_split('/\\s+/', $inputText));
$a=$a^$b; $b=$a^$b; $a=$a^$b;
echo $a.' '.$b;
?>
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