PHP Program to Add Without Plus with Explanation
PHP
Hard
PHP Operators
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1 min read
82 words
This problem helps you practice core PHP fundamentals in a practical way. It builds intuition around add, one, plus. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Input a and b (non-negative). Add them using bit operations only.
Input Format
One line: a b.
Output Format
One integer sum.
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+/', $inputText));
while($b!=0){
$carry=($a & $b) << 1;
$a = $a ^ $b;
$b = $carry;
}
echo $a;
?>
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 a and b (non-negative). Add them using bit operations only.
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+/', $inputText));
while($b!=0){
$carry=($a & $b) << 1;
$a = $a ^ $b;
$b = $carry;
}
echo $a;
?>
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