bKByov

bkbyov.markdown

bKByov

A Pen by Wiliez254 on CodePen.

License.

script.livescript

var num = prompt("Give number");

function fact(num) {
	
	var fact;
	while(num>0){
		
		fact *= num--;

		num--;
	}

	return fact;
}

alert("Factorial is: "+fact(num));

Line 5 needs to be
var fact = 1;
so you don't start by multiplying by 0

Line 8 needs to be
fact *= num;
so you are multiplying "fact" by the current counter BEFORE you decrement "num" by 1