javascript - factorial of a number

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javascript - factorial of a number

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <title> New Document </title>
  <script type="text/javascript">
 function fact(num)
 {
    var x=parseInt(num);
    //alert(x+1);
    if(x>0)
        x=x* fact(x-1);
    alert(x);
 }
  </script>
 </head>

 <body>
 <form name="f1">
  Enter the Number  :<input type="text" length="8" name="txt1"><br>
  <input type="button" value="Find factiorial" onclick="fact(txt1.value)">
  </form>
 </body>
</html>

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1 Answer

深蓝 · Answer 1 · 2021-10-23T19:14:39+0000

You have to return the value. Here you go:

function fact(x) {
   if(x==0) {
      return 1;
   }
   return x * fact(x-1);
}

function run(number) {
    alert(fact(parseInt(number, 10)));
}

and

<input type="button" value="Find factiorial" onclick="run(txt1.value)">

(How to make it work for negative numbers I leave up to you ;) (but I showed in this post anyway))

Just for fun, a more correct, non recursive algorithm:

function fact(x) {
       if(x == 0) {
           return 1;
       }
       if(x < 0 ) {
           return undefined;
       }
       for(var i = x; --i; ) {
           x *= i;
       }
       return x;
}

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