Voor wie de Romeinse tekens niet uit zijn hoofd heeft geleerd... Vul hierboven een jaartal in.. druk op convert.. et voila.. !
<script type="text/javascript"> <!-- function Level(i, v, x) { this.i = i; this.v = v; this.x = x } levels = new Array(); levels[0] = new Level('I', 'V', 'X'); levels[1] = new Level('X', 'L', 'C'); levels[2] = new Level('C', 'D', 'M'); function calcDigit(d, l) { if (l > 2) { str = ''; for (var m = 1; m <= d * Math.pow(10, l - 3) ; m++) str += 'M'; return str } else if (d == 1) return levels[l].i else if (d == 2) return levels[l].i + levels[l].i else if (d == 3) return levels[l].i + levels[l].i + levels[l].i else if (d == 4) return levels[l].i + levels[l].v else if (d == 5) return levels[l].v else if (d == 6) return levels[l].v + levels[l].i else if (d == 7) return levels[l].v + levels[l].i + levels[l].i else if (d == 8) return levels[l].v + levels[l].i + levels[l].i + levels[l].i else if (d == 9) return levels[l].i + levels[l].x else return '' } function toRoman(n) { var r = '' for (var c = 0; c < n.length; c++) r += calcDigit(eval(n.charAt(c)), n.length - c - 1); return r } function fromRoman(n) { var r = 0 for (var c = 0; c < n.length; c++) { var chr = n.charAt(c).toLowerCase(); if (c < n.length - 1) var next = n.charAt(c + 1).toLowerCase() else var next = ''; if (c > 0) var prev = n.charAt(c - 1).toLowerCase() else var prev = ''; if (chr == 'i') { if (next == 'v') r += 4 else if (next == 'x') r += 9 else r += 1; continue } if (chr == 'v') { if (prev != 'i') r += 5; continue } if (chr == 'x') { if (prev != 'i') if (next == 'l') r += 40 else if (next == 'c') r += 90 else r += 10; continue } if (chr == 'l') { if (prev != 'x') r += 50; continue } if (chr == 'c') { if (prev != 'x') if (next == 'd') r += 400 else if (next == 'm') r += 900 else r += 100; continue } if (chr == 'd') { if (prev != 'c') r += 500; continue } if (chr == 'm') { if (prev != 'c') r += 1000; continue } } return r } function isNuneric(str) { for (var c = 0; c < str.length; c++) { var chr = str.charAt(c); if (chr != '0' & chr != '1' & chr != '2' & chr != '3' & chr != '4' & chr != '5' & chr != '6' & chr != '7' & chr != '8' & chr != '9') return false } return true } function get(f) { var n = f.elements[0].value if (!isNuneric(n)) { for (var c = 0; c < n.length; c++) { var chr = n.charAt(c).toLowerCase(); if (chr != 'i' & chr != 'v' & chr != 'x' & chr != 'l' & chr != 'c' & chr != 'd' & chr != 'm') { alert ('Only the letters I (1),V (5), X (10), L (50), C (100), D (500), M (1000)'); return false } } mode = 'fromRoman' } else mode = 'toRoman'; if (mode == 'toRoman') f.elements[0].value = toRoman(f.elements[0].value) else f.elements[0].value = fromRoman(f.elements[0].value); return false } function focus() { if (navigator.userAgent.indexOf('Mozilla/3') != -1 | navigator.userAgent.indexOf('Mozilla/4') != -1) document.forms[0].elements[0].focus() } // --> </script>
<body onload="focus()">
<table border=0 align=center><tr><td>Met deze calculator worden decimale cijfers omgezet in romeinse cijfers... en omgekeerd. Bijv 2003 = <b>MMIII</b></td></tr></table> <form onsubmit="return get(this)"> <table border=0 cellpadding=0 cellspacing=0 align=center> <tr> <td> <center> <input type="text" size="15"> <input type="submit" value="Convert"></center> </td> </tr> </table> </form>
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