<html>
<body>
<script>
/* A variable in javascript is simply a name of storage location which is also known as identifiers. There are two types of variables in javascript : local and global.
Rules for declaring a variable.
--> Name must start with a letter (a to z or A to Z), underscore( _ ), or dollar( $ ) sign.
--> After first letter we can use digits (0 to 9), for example value1.
--> Javascript variables are case sensitive, for example x and X are different variables.*/
var x = 10;
var y = 20;
var z=x+y;
document.write(z);
var _value="MaHi"
document.write(_value);
</script>
</body>
</html>
<body>
<script>
/* A variable in javascript is simply a name of storage location which is also known as identifiers. There are two types of variables in javascript : local and global.
Rules for declaring a variable.
--> Name must start with a letter (a to z or A to Z), underscore( _ ), or dollar( $ ) sign.
--> After first letter we can use digits (0 to 9), for example value1.
--> Javascript variables are case sensitive, for example x and X are different variables.*/
var x = 10;
var y = 20;
var z=x+y;
document.write(z);
var _value="MaHi"
document.write(_value);
</script>
</body>
</html>
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