<html>
<head>
<title>C�lculo de fatorial</title>
<script language="javascript1.2">
function calculaFatorial()
{
var num, total=1, cont;
num = parseInt(document.fat.num.value);
if(num < 0)
{
document.getElementById('resultado').innerText = "N�o existe fatorial de n�mero negativo";
}
else if(num == 0)
{
document.getElementById('resultado').innerText = "O fatorial de 0 � 1";
}
else if(num == 1)
{
document.getElementById('resultado').innerText = "O fatorial de 1 � 1";
}
else
{
for(cont=num; cont>0; cont--)
{
total = total*cont;
}
document.getElementById('resultado').innerText = "O fatorial de "+ num +" � "+ total;
}
}
</script>
</head>
<body>
<form name="fat" method="POST" action="" onsubmit="javascript:return calculaFatorial()">
<table align="center">
<tr>
<td colspan="2"><b>C�culo de Fatorial</b></td>
<tr>
<tr>
<td>Digite um n�mero</td>
<td><input name="num" id="num" type="text" size="10" /></td>
</tr>
<tr>
<td> </td>
<td><input name="enviar" id="enviar" type="button" value="Calcular" onclick="calculaFatorial()" /></td>
</tr>
<tr>
<td id="resultado" colspan="2" align="center"> </td>
</tr>
</table>
</form>
<wbr
</html>