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Positive and Negative Number Using JavaScript Ternary Operator

I wrote this program that will ask the user to give a number and then the program will check and determine if the given number by the user is a positive or negative number using JavaScript ternary operator as my programming language.
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Screenshot if the given number is positive.
Screenshot of the given number is negative.
<html>
 <head>
   <title>Positive and Negative Number Using JavaScript Ternary Operator</title>
</head>   
<style>
    body {
        font-family: Arial, Helvetica, sans-serif;
        size:15px;
    }
</style>
<body>

    <h2>Positive and Negative Number Using JavaScript Ternary Operator</h2>
    <p> Written By Jake R. Pomperada</p>
    
   Give a Number &nbsp;&nbsp;<input id="num_val" value="" />


     <br><br>
    <button onclick="Check()">Ok</button>
    <br>
    <p id="demo"></p>
    
    <script>
    function Check() {
      var num_val, result;
      num_val = Number(document.getElementById("num_val").value);
      if (isNaN(num_val)) {
        result = "The given value is not a number. Try Again.";
      } else {
        result = (num_val < 0) ? "The given number is Negative." : "The given number is Positive.";
      }
      document.getElementById("demo").innerHTML = result;
    }
    </script>
</body>
</html>

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