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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>factorial</title>
    <script language="javascript">
        var n,i,fact=1;
        n=parseInt(window.prompt("enter a number"));
        if(n==0)
        {
            document.writeln("factorial is 1");
        }
        else 
        {
for(i=1;i<=n;i++)
        {
            fact=fact*i;
        }
        
            document.writeln("factorial is"+fact);
            
        }
    </script>
</head>
<body>
    
</body>
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