factorial of a number

Question

I have the following code but it is not giving perfect result for factorial can u find it out plz

Answer 1

Here's a short recursive version:

function doFact(n) {
  return +!(+(n)) || doFact(n - 1) * n;
}

function factorialFromInput() {
  var theInputVal = document.getElementsByTagName("input")[0].value;
  var theContainer = document.getElementById("resultContainer");
  theContainer.innerHTML = "" + doFact(Math.abs(theInputVal));
}

.wrapper>* {
  line-height: 2em;
  width: 30%;
}
#resultContainer {
  border: outset grey;
  min-height: 1.1em;
  padding-left: 0.3em;
  background-color: #eff0f1;
  overflow: scroll;
}

  
  

  Calculate Factorial