Here is a JavaScript to calculate the factorial of number, given by a user:
The interface looks like this:
And here is the code:
<!DOCTYPE html>
<html>
<body>
<p>Factorial: Enter the number and click calculate.</p>
X:<input id="x" value="1"/><br><br>
<button onclick="myFunction()">Calculate Factorial</button>
<p id="demo"></p>
<script>
function myFunction()
{
var x = document.getElementById("x").value
document.getElementById("demo").innerHTML="Factorial of " + x + " = " + fact(x);
}
function fact(x)
{
if (x==1)
{return 1;}
else
{return x*fact(x-1);}
}
</script>
</body>
</html>
Enjoy 😛
Indyarock 