PHP Program to Round to K Decimals with Explanation
PHP
Hard
PHP Data Types
20 views
1 min read
86 words
This problem helps you practice core PHP fundamentals in a practical way. It builds intuition around decimal, one, round. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Input x and k. Print x rounded to k decimals.
Input Format
One line: x k.
Output Format
One number with k decimals.
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;
[$x,$k]=preg_split('/\\s+/', $inputText, 2);
$k=intval($k);
$val=floatval($x);
echo number_format(round($val,$k),$k,'.','');
?>
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 x and k. Print x rounded to k decimals.
Input / Output
Output
One number with k decimals.
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;
[$x,$k]=preg_split('/\\s+/', $inputText, 2);
$k=intval($k);
$val=floatval($x);
echo number_format(round($val,$k),$k,'.','');
?>
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