Question

Please make sure to write the test function!

Using PHP, design a function that given a Roman numerale in input, is able to compute the modern Hindu-Arabic numeral system representation (aka, 0123456789). For example: Output Input VI IV MCMXC 1990 • Be sure to add all the necessary checks and at least one testing function, • Try to split the logic in small functions. What is a "check"? If you have a function that accepts an input, you want to check if such input falls in the right boundary or, in case of loosely typed languages such as PHP, if belongs to the right type. Example: function test(nr) if (nr < 0) return NULL else // the function can continue

Answer 1

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Answer :

<?php
function test($nr){
//array created with the priority order.
$romans = 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,
);

$result = 0;
//In the below loop we are searching the input with the roman array if we found a match with the input in the array than related value is added to result.
foreach ($romans as $key => $value) {
while (strpos($nr, $key) === 0) {
$result += $value;
$nr = substr($nr, strlen($key));
}
}
echo $result."<br>";
}
test('VI');
test('IV');
test('MCMXC');
test('IX');

?>

€ → C localhost/HomeworkLib/vinu.php 1990