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character at specified position.

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<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script>

 function cal() {

  var r1=document.forms[0];

  var a=document.frm.txt.value;

  var repeat=0;

  var c;

  

   var pos=prompt("Enter Position: ");

   var ch=a.charAt(parseInt(pos)-1);

   if(ch!="")

    alert("character at specified position is: "+ch);

   else

    alert("Please Enter value between "+ a.length);

  

 }

</script>

<form name="frm">

Enter the string: <input type="text" name="txt" ><br/>


<input type="button" onclick ="cal()" name="b1" value="Submit">

</form>

</body>

</html>