how to find sql server password of client macheine

https://www.elcomsoft.com/asqlpr.html(Advance SQL Password Recovery)

This tool helps you to change or reset the password , you can't able to get or view the password

You can crack password using third party tools for which you have to pay

https://www.elcomsoft.com/asqlpr.html

It only works up to the version SQL2008

I think it is not possible to retrieve the password, but you can reset it by using Login property or by SQL Query

i dont want to reset,how to find it programaticaaly???

If SQL Server was set up to allow local admins you can simply reset the password by connecting with a domain/local admin.