in c++
1:information about store:
 1name of store
 2. location
 3.owner
 4.timings
2. information of store:
 1.goods to be invoiced
 2.quantity of goods
 3.price of goods
 4.defected invoiced goods
operations:
 1.insert,2.delete,3.update,4 modify
menus:
1.total invice bill
2.net bill
3.print bill