PHP Program to Gray Code Value with Explanation
PHP
Hard
PHP Operators
19 views
1 min read
78 words
This problem helps you practice core PHP fundamentals in a practical way. It builds intuition around gray, code, one. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Input n. Print gray code g = n ^ (n>>1).
Input Format
One integer n.
Output Format
One integer g.
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;
$n=intval($inputText);
echo ($n ^ ($n>>1));
?>
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
Input n. Print gray code g = n ^ (n>>1).
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;
$n=intval($inputText);
echo ($n ^ ($n>>1));
?>
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