Question

In: Computer Science

Using a combination of HTML/PHP, implement a web page where the users can upload a text...

Using a combination of HTML/PHP, implement a web page where the users can upload a text file, exclusively in .txt format, which contains a string of 400 numbers, such as:

71636269561882670428
85861560789112949495
65727333001053367881
52584907711670556013
53697817977846174064
83972241375657056057
82166370484403199890
96983520312774506326
12540698747158523863
66896648950445244523
05886116467109405077
16427171479924442928
17866458359124566529
24219022671055626321
07198403850962455444
84580156166097919133
62229893423380308135
73167176531330624919
30358907296290491560
70172427121883998797

Your code should contain a PHP function that, accepting the string of 400 numbers in input, is able to find the greatest product of four adjacent numbers in all the four possible directions (up, down, left, right, or diagonally).

NOTE:

  • You will need to arrange the numbers in a grid 20x20.
  • If the file doesn't contain 400 numbers or contains some characters in between, it should be discarded and the application should inform the user that the file is not format correctly.
  • You can ignore new lines and white spaces.
  • Add a tester function to check the behavior of your PHP function.

  • tester function should cover all possible checks:

    1) correct file format

    2) proper file contents

    3) size of the file

    4)For any file, with known answer check if the function returns the same answer (true test case). Because with null string and all the application itself wont work. Until we upload any file. You can add another possibilities here, will help in enhancing test cases.

  • Follow the guidelines showed to avoid losing points.

Correct solution will be highly appreciated

Solutions

Expert Solution

Working code implemented in PHP and appropriate comments provided for better understanding.

index.php Source Code:

<?php
echo <<<_END
<html><head><title>PHP Form Upload</title></head><body>
<form method='post' action='index.php' enctype='multipart/form-data' >
Select File: <input type='file' name='uploadfileinput' size='10' >
<input type='submit' value='Upload'>
</form>
_END;

if($_FILES){
$inputtype = $_FILES['uploadfileinput']['type'];

if($inputtype == "text/plain"){

// Accessing the Name of the file uploaded.
$name = $_FILES['uploadfileinput']['name'];

// Opening the file and reading the lines of numbers.
$fh = fopen($name, 'r') or die("File Does not exist");

// Assigning all the values to an array.
$charArray = [];
while(!feof($fh)){
$line = fgets($fh);
$tempCharArray = str_split($line);
array_push($charArray, $tempCharArray);
}
  
fclose($fh);

// Validate for the right input and Give out the ANSWER.
if(validateInputData($charArray) != true){
echo "Error: File is Not Formatted properly.";
}else{
// Giving out the Answer if everything is Correct.
echo "File Name: " . $name . " <br> ";

echo "The max product is: <h1>";
echo calculateProduct($charArray);
echo "</h1>";
}

tester($charArray);

}else{
echo "Illegal File Type: Please Upload a text file with extension .txt only";
echo "<br>";
}
}

// Ignored the top and left cases because it will be the same as right and bottom.
function calculateProduct($charArray){
$product = 0;
for($row = 0; $row < sizeof($charArray); $row++){
for($col = 0; $col < sizeof($charArray[$row]); $col++){
if($charArray[$row][$col] !== "\n"){
//Right
$tempProductRight = $charArray[$row][$col] * $charArray[$row][$col + 1] * $charArray[$row][$col + 2] * $charArray[$row][$col + 3];
//Bottom
$tempProductDown = $charArray[$row][$col] * $charArray[$row + 1][$col] * $charArray[$row + 2][$col] * $charArray[$row + 3][$col];
//Diagnol
$tempProductCross = $charArray[$row][$col] * $charArray[$row + 1][$col + 1] * $charArray[$row + 2][$col +2] * $charArray[$row + 3][$col + 3];

// Getting the max from Right, Bottom and Diagnol.
$tempMax = max($tempProductRight, $tempProductDown, $tempProductCross);

if($tempMax > $product){
$product = $tempMax;
}
}
}
}
return $product;
}

//Method to find if the length is 400 and has the right datatypes in the string.
function validateInputData($charArray){
$counter = 0;

for($row = 0; $row < sizeof($charArray); $row++){
for($col = 0; $col < sizeof($charArray[$row]); $col++){
if($charArray[$row][$col] !== "\n"){
$val = $charArray[$row][$col];
if(is_numeric($val) != true){
return false;
}
$counter++;
}
}
}

if($counter != 400){
return false;
}

return true;
}

//Tester function is being called in the main area after echoing the answer.
function tester($charArray){
echo "<br> <br> Tester Function: <br>";

$inputWithDifferentDatatypeInBetween = '12345d7567m';

$inputWithLengthLessThanFourHundred = '71636269561882677';
  
if(validateInputData($charArray) != true){
echo "Error: Data Invalid";
echo "<br>";
}else{
// Giving out the Answer if everything is Correct.
echo "Test 1: For Correct Data: ";
echo calculateProduct($charArray);
echo "<br>";
}

if(validateInputData($inputWithDifferentDatatypeInBetween) != true){
echo "Test 2: For Incorrect Data with Datatypes other than numeric in between: ";
echo "Error: Data Invalid";
echo "<br>";
}else{
echo calculateProduct($charArray);
}

if(validateInputData($inputWithLengthLessThanFourHundred) != true){
echo "Test 3: For length not equal to 400: ";
echo "Error: Data Invalid";
echo "<br>";
}else{
echo calculateProduct($charArray);
}


}

echo "</body></html>

venereology answered 10 months ago
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