<script language="JavaScript" type="text/javascript">
   /*<![CDATA[  XML blockout */
   <!--
   function load() {
    /////////////// Called by BODY tag when page first loads ...

    // test browser version ...
    if (parseInt(navigator.appVersion.charAt(0)) < 4) {alert('Désolé, votre navigateur ne supporte pas \n JavaScript.')}
     else {

      // clear framing if page was referred from site with frames ...
      if (self != top) {top.location.href = self.location.href};

      // clear field in number / numerals conversion ...
      document.forms[0].elements[0].value = '';

      // fill fields in date conversion form ...
      update(true);

      // enter default into calculator field ...
      document.forms[2].elements[0].value = '                  .';

      // enter number or numeral into Roman Test field ...
      gen(); document.forms[3].elements[3].value = '';

      // give focus to numerals conversion input field ...
      document.forms[0].elements[0].focus()
     }
   }
   /* XML end  ]]>*/
   // -->
  </script>
  <script language="JavaScript1.1" type="text/javascript">
   /*<![CDATA[  XML blockout */
   <!--
   function cvt() {
   /////////////// Roman numeral <--> number conversion ...

    // Evaluates input string passed from FORM; either converts a number to a
    // Roman numeral, or converts a Roman numeral to a number.

    // get string passed from FORM and declare local variables ...
    var inp = document.forms[0].elements[0].value, num = '', i = 0, n = 0;

    // trim leading spaces and trailing spaces or words...
    while (inp.charAt(0) == ' ') {inp = inp.substr(1)};
    if (inp.indexOf(' ') != -1) {inp = inp.substr(0, inp.indexOf(' '))}

    // check for valid input string ...
    if (inp == '') {msg = 'Aucune donnée à convertir'}

     else {

      // check if input string is a number ...
      if (isNaN(inp)) {

       // input was a not a number, so convert Roman -> number ...
       num = inp;

       // for lower-case input, allow 'u' as alternate for 'v' and 'ij' as alternate for trailing 'ii' ...
       if (num == num.toLowerCase()) {
        i = num.indexOf('u'); if (i != -1) {num = num.substr(0, i) + 'v' + num.substr(i + 1, num.length - i)};
        if (num.substr(num.length - 2, 2) == 'ij') {num = num.substr(0, num.length - 2) + 'ii'};
       }

       n = evalRoman(num);
       if (n == -1) {msg = inp + ' est incorrect'}
        else {msg = inp + ' = ' + n};
      }
       else {

        // input was a number so convert number -> Roman ...
        n = Math.round(parseFloat(inp));
        if (n < 1 || n > 4999) {msg = n + ' est hors limites'}
         else {
          if (n != parseFloat(inp)) {alert(inp + ' sera arrondi à  ' + n)};
          msg = n + ' = ' + cvts(n);
         }

       }

     }

    document.forms[0].elements[0].value = msg;
    document.forms[0].elements[0].focus()

   }

   function evalRoman(num) {
    // evaluate Roman numeral string ...
    var i = 0, h = 0, n, t = 0, u = 0;

    // ensure upper case and evaluate thousands ...
    num = num.toUpperCase();
    while (num.charAt(i) == 'M') {i ++};
    n = i * 1000;

    // evaluate hundreds ...
    if (num.substr(i, 2) == 'CM') {h = 9; i += 2}
     else if (num.substr(i, 1) == 'D') {h = 5; i ++}
      else if (num.substr(i, 2) == 'CD') {h = 4; i += 2};
    if (h == 0 || h == 5) {while (num.charAt(i) == 'C') {h ++; i ++}};
    n += h * 100;

    // evaluate tens ...
    if (num.substr(i, 2) == 'XC') {t = 9; i += 2}
     else if (num.substr(i, 1) == 'L') {t = 5; i ++}
      else if (num.substr(i, 2) == 'XL') {t = 4; i += 2};
    if (t == 0 || t == 5) {while (num.charAt(i) == 'X') {t ++; i ++}};
    n += t * 10;

    // evaluate units ...
    if (num.substr(i, 2) == 'IX') {u = 9; i += 2}
     else if (num.substr(i, 1) == 'V') {u = 5; i ++}
      else if (num.substr(i, 2) == 'IV') {u = 4; i += 2};
    if (u == 0 || u == 5) {while (num.charAt(i) == 'I') {u ++; i ++}};
    n += u;

    // check all subtractive and additive combinations for a valid Roman numeral ...
    if (!((num == cvt1000(n) + cvt100s(n) + cvt10s(n) + cvt1s(n))
       || (num == cvt1000(n) + cvt100s(n) + cvt10s(n) + cvt1a(n))
       || (num == cvt1000(n) + cvt100s(n) + cvt10a(n) + cvt1s(n))
       || (num == cvt1000(n) + cvt100s(n) + cvt10a(n) + cvt1a(n))
       || (num == cvt1000(n) + cvt100a(n) + cvt10s(n) + cvt1s(n))
       || (num == cvt1000(n) + cvt100a(n) + cvt10s(n) + cvt1a(n))
       || (num == cvt1000(n) + cvt100a(n) + cvt10a(n) + cvt1s(n))
       || (num == cvt1000(n) + cvt100a(n) + cvt10a(n) + cvt1a(n)))) {n = -1}

    return(n); // with n in range 1 &ndash; 4999, or n = -1 for invalid numeral
   }

   function cvts(n) {
    // converts number 1 - 4999 to a subtractive Roman numeral ...
    return (cvt1000(n) + cvt100s(n) + cvt10s(n) + cvt1s(n))
   }

   function cvt1000(n) {
    // converts thousands digit to a Roman numeral ...
    return ('MMMM'.substr(0, (Math.floor(n / 1000))));
   }

   function cvt100s(h) {
    // converts hundreds digit to a subtractive Roman numeral ...
    var m = '', h = Math.floor((h % 1000) / 100);
    if (h == 9) {m = 'CM'}
     else if (h > 4) {m = 'DCCC'.substr(0, h - 4)}
      else if (h == 4) {m = 'CD'}
       else {m = 'CCC'.substr(0, h)};
    return m;
   }

   function cvt100a(h) {
    // converts hundreds digit to an additive Roman numeral ...
    // used only in error-trapping Roman input
    var m = '', h = Math.floor((h % 1000) / 100);
    if (h > 4) {m = 'DCCCC'.substr(0, h - 4)}
      else {m = 'CCCC'.substr(0, h)};
    return m;
   }

   function cvt10s(t) {
    // converts tens digit to a subtractive Roman numeral ...
    var m = '', t = Math.floor((t % 100) / 10);
    if (t == 9) {m = 'XC'}
     else if (t > 4) {m = 'LXXX'.substr(0, t - 4)}
      else if (t == 4) {m = 'XL'}
       else {m = 'XXX'.substr(0, t)};
    return m;
   }

   function cvt10a(t) {
    // converts tens digit to an additive Roman numeral ...
    // used only in error-trapping Roman input
    var m = '', t = Math.floor((t % 100) / 10);
    if (t > 4) {m = 'LXXXX'.substr(0, t - 4)}
     else {m = 'XXXX'.substr(0, t)};
    return m;
   }

   function cvt1s(u) {
    // converts units digit to a subtractive Roman numeral ...
    var m = '', u = u % 10;
    if (u == 9) {m = 'IX'}
     else if (u > 4) {m = 'VIII'.substr(0, u - 4)}
      else if (u == 4) {m = 'IV'}
       else {m = 'III'.substr(0, u)};
    return m;
   }

   function cvt1a(u) {
    // converts units digit to an additive Roman numeral ...
    // used only in error-trapping Roman input
    var m = '', u = u % 10;
    if (u > 4) {m = 'VIIII'.substr(0, u - 4)}
     else {m = 'IIII'.substr(0, u)};
    return m;
   }

   function rst() {
    // Reset button clears field in number / numerals conversion ...
    document.forms[0].elements[0].value = '';
    document.forms[0].elements[0].focus();
   }
   //////////////// global variables ...
   var ans = 0, ques = 0, nr = '';
 
   // -->
   /* XML end  ]]>*/
  </script>
    
  <html>
<head>
<title>le site des philat&eacute;listes francophones</title>
</head>
<body >
<center><table WIDTH="100%" BORDER="0" cellpadding="2" bgcolor="#ffffcc"><tr><td align=Left><a href="http://www.coppoweb.com/pda/index.php" title="Accueil"><img src="favicon.jpg" width="16" height="16" alt="Accueil" border="0">
<font color="Maroon" size="+2"><b>COPPOWEB</b></font></a></td>
<td align=right><font size="-2"><a href="http://www.coppoweb.com/pda/index.php" title="Accueil">&lt;Accueil</a></font></td></tr><tr><td colspan=2 align=Center><small><b><font color="Maroon">le site des philat&eacute;listes francophones</font></b></small></td></tr></table>
</center>
<hr> <body onload="load()">

  <table align="Center" border="0" cellpadding="5" cellspacing="0">
   <tr>
    <th>
     <h2><font color="maroon"><b><small>Conversion entre</small><br />Nombres arabes <br /><small>et</small><br /> Nombres Romains</b></font></h2>
     <p>Entrez un nombre compris entre <code>1 et 4999</code> ou<br /> un nombre romain de I à MMMMCMXCIX</p>

     <form action="#">
      <input size="28" /><br />
      <input type="button" value="et cliquez ici." onclick="cvt();" class="button" />
      <input type="button" value="Recommencer" onclick="rst()" class="button" />
     </form>
     &nbsp;<br />
     <code>M: 1000&nbsp; &nbsp; D: 500&nbsp; &nbsp; C: 100<br />L: 50&nbsp; &nbsp; X: 10&nbsp; &nbsp; V: 5&nbsp; &nbsp; I: 1</code>

    </th>
   </tr>
  </table>

  <noscript><b><big>Attention : il faut autoriser JavaScript<br />&amp; les feuilles de style, et recharger la page.</big></b></noscript>
  
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