PHP Program to Compose Two Functions with Explanation
PHP
Hard
PHP Functions
36 views
1 min read
98 words
This problem helps you practice core PHP fundamentals in a practical way. It builds intuition around two, compose, function. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Input x. Define f(x)=x+3 and g(x)=x*2. Compute g(f(x)) and f(g(x)) and print both.
Input Format
One integer x.
Output Format
Two integers: g(f(x)) f(g(x)).
Constraints
|x|
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;
$x=intval($inputText);
function f2($x){ return $x+3; }
function g2($x){ return $x*2; }
$one=g2(f2($x));
$two=f2(g2($x));
echo $one.' '.$two;
?>
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. Define f(x)=x+3 and g(x)=x*2. Compute g(f(x)) and f(g(x)) and print both.
Input / Output
Output
Two integers: g(f(x)) f(g(x)).
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;
$x=intval($inputText);
function f2($x){ return $x+3; }
function g2($x){ return $x*2; }
$one=g2(f2($x));
$two=f2(g2($x));
echo $one.' '.$two;
?>
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