I need some help to get the Latitude and Longitude dynamically of a ZIP Code entered by the user. so that i can work to show the shop address on those area of zip code.
You haven't specified what country you're looking to do this for but you can use the GeoNames API for postalCodeSearch.
For example (XML and JSON responses respectively)
http://api.geonames.org/postalCodeSearch?postalcode=90210&username=demo
http://api.geonames.org/postalCodeSearchJSON?postalcode=90210&username=demo