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JavaScript Practice Questions And Answer

Problem: Write a program to calculate sum of digits of a number.
Solution:

<html>
 <head>
  <script>
    function demo1()
    {
      var n = 8973
      var sum = 0 
       while(n>0)
      {
        var r = n%10
        n = parseInt(n / 10)
        document.write(n , "-", r, "<br>")
        sum = sum + r
      }
       document.write("digit sum = ", sum)
    }
  </script>
 </head>
  <body>
      <input type="button" value="Go" onclick="demo1()" />
  </body>
</html>

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