auditoriska 1 vezbi

<!DOCTYPE html>
<html>
<head>
</head>
<body>
<script type="text/javascript">
var a =prompt("enter number of points");
a=parseInt(a);
if(!isNaN(a))
{
  grade=0;
  if(a>=0 && a<=50) grade=5;
  else if(a>=51 && a<=60) grade=6;
  else if(a>=61 && a<=70) grade=7;
  else if(a>=71 && a<=80) grade=8;
else if(a>=81 && a<=90) grade= 9;
else if(a>=91 && a<=100) grade=10;
  else document.write("wrong number of points");
}
if(grade){
document.write("Student receive grade "+grade);
}
else
  {
    document.write("you have not entered an integer");
  }
</script>
</body>
</html>