Add two variables using jquery

Question

var a = 1;
var b = 2;
var c = a+b;

c will show as 12; but I need 3

How do I do it using jQuery?

Answer 1

    var a =10;
    var b=10;
    var c=a+b;
    alert(c);

    //in  double case
     var e=10.5;
     var f=10.5;
     alert(e+f);

     //forcelly convert to int
     alert(parseInt(e)+parseInt(f));

     //forcelly convert to float
     alert(parseFloat(a)+parseFloat(b));


Example   :

 https://jsfiddle.net/v0rjek67/6/