Question

Using PHP, design a function that given a Roman numeral (Links to an external site.)Links to an external site. in input, is able to compute the modern Hindu–Arabic numeral (Links to an external site.)Links to an external site. 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.

Answer 1

here i have create two function and create Roman numeral to modern Hindu–Arabic numeral

Code Roman_Numeral.php:

<?php
//Roman_symbol_value function returns roman symbol value
function Roman_symbol_value($no)
{
if ($no == 'I')
return 1;
if ($no == 'V')
return 5;
if ($no == 'X')
return 10;
if ($no == 'L')
return 50;
if ($no == 'C')
return 100;
if ($no == 'D')
return 500;
if ($no == 'M')
return 1000;
return -1;
}
//Roman_numeral function it is a given roman numeral
function Roman_numeral(&$string_value)
{
//asign result value zero
$result = 0;
   //loop continues until string_value length  
for ($i = 0; $i < strlen($string_value); $i++)
{

//get value of s[i] and store in a1
$a1 = Roman_symbol_value($string_value[$i]);
if ($i+1 < strlen($string_value))
{
//get value of s[i] and store in a2
$a2 = Roman_symbol_value($string_value[$i + 1]);
// compare a1 and a2
if ($a1 >= $a2)
{
$result = $result + $a1; //store value in result
}
else
{
$result = $result + $a2 - $a1;
$i++;
}
}
else
{
$result = $result + $a1;
$i++;
}
}
return $result;
}
//basic inputs
$str ="VI";
$str1="IV";  
$str2 ="MCMXC";
$str3="IX";  
//basic output in table format with function call Roman_numeral
echo "<table border=1><caption>Roman Numeral</caption><tr><th>Input</th><th>Output</th></tr>",
"<tr><td>",$str,"</td>","<td>",Roman_numeral($str),"</td></tr>",
           "<tr><td>",$str1,"</td>","<td>",Roman_numeral($str1),"</td></tr>",
           "<tr><td>",$str2,"</td>","<td>",Roman_numeral($str2),"</td></tr>",
               "<tr><td>",$str3,"</td>","<td>",Roman_numeral($str3),"</td></tr>";
?>

Output:

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Thank You.