How to use out key word in stored procedure in sql

creating database test 
create database test

after creating database ,create table  Customer in database test

use  test

create table customer (id int primary key IDENTITY(1,1),Name varchar(50),FatherName nvarchar(50))

 creating  procedure with out keyword int_customer  for Customer table */

create proc int_customer @Name varchar(50),@FatherName nvarchar(50),@id int out

as

begin

insert into customer values(@Name,@FatherName)

set @id=@@identity

end

executing procedure for int_customer data in Customer table */

declare @id int

exec int_customer 'Varun','Dev',@id out

select @id as Id