Please Give me Suggestions
There are more than 3 "data types". Suggest you start here:http://publibz.boulder.ibm.com/cgi-bin/ ... 0/184.108.40.206
Then follow the links at the bottom of that page for specific info.
Also suggest you bookmark the Table of Contents of that manual (COBOL Language Reference) as you will use this very often. You might download a copy to your local system for ease of use. The flashlight/tubelight near the top left of that page is the Search for the manual.
In all our applications we r using Alphanumeric in place of Alphabetic
Rather you are most likely using alphanumeric because alphanumeric is the standard most places. There are very few purely alphabetic fields and i have not seen "pic a(nn)" other than a class exercise for a long, long time.