Q.No.3 - Write a program in Java Script to print factorial of the number on a web page.

Sol.- 

<html>
<head>
	<title>Factorial JS- Examcomp</title>
</head>
<body>
<h2>Find Factorial using Javscript</h2>
Enter Number : <input id="num" type="number">
<br><br>
<button onclick="fact()">Check Factorial </button>
Factorail of given number is : <span id="result"></span>
<script >
	function fact() {
		var a = Number(document.getElementById('num').value);
		var fc= 1
		if(a==0){
			fc= "Please Enter number greater than 0." ;
		}
		else if(a<0){
			fc= "Please Enter Positive number." ;
		}
		else {
			while(a>0){
				fc=fc*a  
				a--
			}
		}
		document.getElementById("result").innerHTML=fc;
	}
</script>
</body>
</html>

OUTPUT: