Program:
Output:
<!DOCTYPE html>
<html>
<head>
<script>
function factorial(num)
{
var fact = 1;
for(i=1;i<=num;i++)
{
fact = fact * i ;
}
alert("Factorial of Number "+num+" is "+fact);
}
</script>
</head>
<body>
<button onclick="factorial(5)"> Factorial of 5 </button>
</body>
</html>
Output:
