Created
June 6, 2014 01:09
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<html> | |
<head> | |
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script> | |
<script> | |
var NumberMap = {}; | |
NumberMap.I = 1; | |
NumberMap.V = 5; | |
NumberMap.X = 10; | |
NumberMap.L = 50; | |
NumberMap.C = 100; | |
NumberMap.D = 500; | |
NumberMap.M = 1000; | |
/* | |
* Main logic to get the decimal value | |
*/ | |
function getDecimal(romanNumeral) { | |
var result = 0; | |
var numArray = convertToNumberArray(romanNumeral); | |
for(var x = 0; x < numArray.length;) { | |
// single value | |
if(numArray.length == (x + 1)) { | |
console.log('single number -> ' + numArray[x]); | |
result += numArray[x]; | |
x++; | |
} | |
// need to subtract from 2nd value | |
else if(numArray[x] < numArray[x + 1]) { | |
console.log('subtract case. ' + numArray[x + 1] + ' - ' + numArray[x]); | |
result += numArray[x + 1] - numArray[x]; | |
x += 2; | |
} | |
// large value | |
else { | |
console.log('large value ' + numArray[x]); | |
var repeatedTimes = countFirstRepeats(numArray, x); | |
result += (numArray[x] * repeatedTimes); | |
x += repeatedTimes; | |
} | |
console.log('x -> ' + x + ', length -> ' + numArray.length); | |
} | |
return result; | |
} | |
function countFirstRepeats (array, index) { | |
var number = array[index]; | |
var i = index + 1; | |
var counter = 1; | |
for(counter; counter < 3; counter++) { | |
if(array[index + counter] != number) { | |
break; | |
} | |
} | |
console.log('# of repeats -> ' + i); | |
return counter; | |
} | |
function convertToNumberArray(romanNumeral) { | |
var array = []; | |
for( var i = 0; i < romanNumeral.length; i++ ) { | |
array.push( NumberMap[romanNumeral.charAt(i)] ); | |
} | |
console.log(array); | |
return array; | |
} | |
$(function() { | |
$('form').submit(function(event){ | |
event.preventDefault(); | |
$('#results').html( getDecimal( $('#romanInput').val() ) ); | |
}).submit(); | |
}); | |
</script> | |
</head> | |
<body> | |
<h1>Roman Numeral Calculator</h1> | |
<form> | |
Enter a Roman Numeral (I, V, X, L, C, D, M): <input type="text" pattern="[IVXLCDM]+" placeholder = "Roman Numerals Only" id="romanInput" value="MDCCLXXVI" /> <input type="submit" /> | |
</form> | |
<h3>Results</h3> | |
<div id="results"> | |
</div> | |
</body> | |
</html> |
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See it in action at http://www.bmchild.com/p/roman-numeral-calculator.html