Using PHP, design a function that given a Roman numeral (Wikipedia link.), in input, is able...

Using PHP, design a function that given a Roman numeral (Wikipedia link.), in input, is able to compute the modern Hindu–Arabic numeral (wikipedia link), system representation (aka, 0123456789).

For example:

Input	Output
VI	6
IV	4
MCMXC	1990
IX	9

Be sure to add all the necessary checks and at least one testing function.
Try to split the logic in more small functions.

Solutions

Expert Solution

romantonumber.php:

<!DOCTYPE html>
<html>
<head>
   <title>Roman to Hindu-Arabic Number</title>
   <style>
   table{
       width:50%;
       border-collapse:collapse;
       text-align:center;
   }
</style>
</head>
<body>
<center>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
<input type="text" id="roman_input" name="roman_input" placeholder="Enter Roman Number">
<input type="submit" value="Convert"/>
</form>
<br/>
<?php

$roman_numbers = array('M' => 1000,'CM' => 900,'D' => 500,'CD' => 400,'C' => 100,'XC' => 90,'L' => 50,'XL' => 40,'X' => 10,'IX' => 9,'V' => 5,'IV' => 4,'I' => 1);
if(!isset($_POST['roman_input']))
return 0;
else{
$roman_input = strtoupper($_POST['roman_input']);
$output = 0;

foreach ($roman_numbers as $key => $value) {
while (strpos($roman_input, $key) === 0) {
$output += $value;
$roman_input = substr($roman_input, strlen($key));
}
}

//output
echo "<table border='1'>";
echo "<tr><th>Input</th><th>Output</th></tr>";
echo "<tr><td>".strtoupper($_POST['roman_input'])."</td><td>".$output."</td></tr>";
echo "</table>";
}
?>
</center>
</body>
</html>

Output Screenshots:

venereology answered 2 hours ago

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