📄 ch4_examp1.htm

📁 javascript source code part1

💻 HTM

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<HTML>
<BODY>

<SCRIPT LANGUAGE=JavaScript>

function checkCharType(charToCheck)
{
   var returnValue = "O";
   var charCode = charToCheck.charCodeAt(0);

   if (charCode >= "A".charCodeAt(0) && charCode <= "Z".charCodeAt(0))
   {
      returnValue = "U";
   }
   else if (charCode >= "a".charCodeAt(0) && charCode <= "z".charCodeAt(0))
   {
      returnValue = "L";
   }
   else if (charCode >= "0".charCodeAt(0) && charCode <= "9".charCodeAt(0))
   {
      returnValue = "N";
   }
   return returnValue;
}

var myString = prompt("Enter some text","Hello World!");
switch (checkCharType(myString))
{
   case "U":
      document.write("First character was upper case");
      break;
   case "L":
      document.write("First character was lower case");
      break;
   case "N":
      document.write("First character was a number");
      break;
   default:
      document.write("First character was not a character or a number");
}

</SCRIPT>
</BODY>
</HTML>

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