[javascript] How to get numeric value from a prompt box?

I was trying to do some simple mathematical calculations in HTML and jQuery and JavaScript, so I wanted to get input from user.
For input I tried doing this :

 var x = prompt("Enter a Value","0");
 var y = prompt("Enter a Value", "0");

But I am not able to perform any kind of calculations as these values are strings.
Please, can any one show me how to convert them into integers.

JavaScript will "convert" numeric string to integer, if you perform calculations on it (as JS is weakly typed). But you can convert it yourself using parseInt or parseFloat.

Just remember to put radix in parseInt!

In case of integer inputs:

var x = parseInt(prompt("Enter a Value", "0"), 10);
var y = parseInt(prompt("Enter a Value", "0"), 10);

In case of float:

var x = parseFloat(prompt("Enter a Value", "0"));
var y = parseFloat(prompt("Enter a Value", "0"));

You can use parseInt() but, as mentioned, the radix (base) should be specified:

x = parseInt(x, 10);
y = parseInt(y, 10);

10 means a base-10 number.

See this link for an explanation of why the radix is necessary.

You have to use parseInt() to convert

For eg.

  var z = parseInt(x) + parseInt(y);

use parseFloat() if you want to handle float value.

Working Demo Reading more Info

parseInt(x) it will cast it into integer

x = parseInt(x);
x = parseInt(x,10); //the radix is 10 (decimal)

parseFloat(x) it will cast it into float

Working Demo Reading more Info

x = parseFloat(x);

you can directly use prompt

var x = parseInt(prompt("Enter a Number", "1"), 10)

var xInt = parseInt(x)

This will return either the integer value, or NaN.

Read more about parseInt here.