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Java Script Variable

Java Script variable may be used to store a value and declared as var var a=10, here 10 is stored in variable a . Variables may be local and global variable. Variable type depends on the value it stores. eg var i=10; (integer value) var name=”Sharp Tutorial” (String Value)

prompt() is used to take the input from the user and parseInt() to convert string to int.

prompt() : method to take input from user

parseInt(): method to convert string value to int type

alert(“Pop Up”) : to display the msg box in pop up alertbox

Program to Take two number as input and pop up their sum

<html>
<title>JS introduction</title>
<head>
<script>
var n1=parseInt(prompt("enter first number"));
var n2=parseInt(prompt("enter second number"));
var n=n1+n2;
alert("sum="+n);
</script>
</head>
</body>
</body>
</html>

[codepen_embed height="265" theme_id="default" slug_hash="jOEMvpQ" default_tab="js,result" user="rajputadesh"]See the Pen jOEMvpQ by rajput adesh (@rajputadesh) on CodePen.[/codepen_embed]

How to make comment in java Script

// this is single line comment and not executed this line

multiline comment and skipped the whole block

<html>
<title>JS introduction</title>
<head>
<script>
// single line comment
/* multi line comment
  this line will not be executed */
</script>
</head>
</body>
</html>

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Java Script Variable

Program to Take two number as input and pop up their sum

How to make comment in java Script

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