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<html>
    <head> 
     <script type = "text/javascript">
         <!--
            function sayHello() {
               alert("Hello World")
            }
         //-->
         
                  <!--
            var myVar = "global";      // Declare a global variable
            function checkscope( ) {
               var myVar = "local";    // Declare a local variable
               document.write(myVar);
            }
         //-->
      </script>     
    </head>
   <body >   
   <p></p>
    <input type = "button" onclick = "sayHello()" value = "Say Hello" />
   
      <script language = "javascript" type = "text/javascript">
         <!--
            document.write("Hello World!")
         //-->

         <!--
              var1 = 10; var2 = 20;
           //-->
           
          <!--
      // This is a comment. It is similar to comments in C++
   
      /*
      * This is a multi-line comment in JavaScript
      * It is very similar to comments in C Programming
      */
   //-->

      <script language = 'javascript' type = "text/javascript">  
          var money, name;
          
          var name = "Ali";
          var money;
          money = 2000.50;
          

          
     <script> 
      
      
          <script language = 'javascript' type = "text/javascript">
         <!--
            var a = 33;
            var b = 10;
            var c = "Test";
            var linebreak = "<br />";
         
            document.write("a + b = ");
            result = a + b;
            document.write(result);
            document.write(linebreak);
         
            document.write("a - b = ");
            result = a - b;
            document.write(result);
            document.write(linebreak);
         
            document.write("a / b = ");
            result = a / b;
            document.write(result);
            document.write(linebreak);
         
            document.write("a % b = ");
            result = a % b;
            document.write(result);
            document.write(linebreak);
         
            document.write("a + b + c = ");
            result = a + b + c;
            document.write(result);
            document.write(linebreak);
         
            a = ++a;
            document.write("++a = ");
            result = ++a;
            document.write(result);
            document.write(linebreak);
         
            b = --b;
            document.write("--b = ");
            result = --b;
            document.write(result);
            document.write(linebreak);
         //-->
      </script>
      <p>This is web page body </p>
      

      </script>
   </body>
</html>

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