Variables are used to store values (name = "John") or expressions (sum = x + y). Before using a variable, you first need to declare it. You have to use the keyword var to declare a variable like this:

var name;

You can assign a value to the variable either while declaring the variable or after declaring the variable.

var name = "John";

OR

var name;

name = "John";

Naming Variables

Though you can name the variables as you like, it is a good programming practice to give descriptive and meaningful names to the variables. Moreover, variable names should start with a letter and they are case sensitive. Hence the variables studentname and studentName are different because the letter n in name is different (n and N).

Try this yourself:


	<html>

	<head>

	<title>Variables!!!</title>

	<script type="text/javascript">

	var one = 22;

	var two = 3;

	var add = one + two;

	var minus = one - two;

	var multiply = one * two;

	var divide = one/two;

	document.write("First No: = " + one + "<br />Second No: = " + two + " <br />");

	document.write(one + " + " + two + " = " + add + "<br/>");

	document.write(one + " - " + two + " = " + minus + "<br/>");

	document.write(one + " * " + two + " = " + multiply + "<br/>");

	document.write(one + " / " + two + " = " + divide + "<br/>");

	</script>

	</head>

	<body>

	</body>

	</html>

 

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