Answer to Question #55408 in C++ for Gagan

Question

A blood bank maintains a data file that contains the following information for every donor : Name ,Date of Birth ,Telephone number,Blood Group.Write a program in c++ to do the following :
1) Given a blood group,display name ,date of birth,and phone number of all the persons of the given blood group.
2) Append records in the file.
3)Input a telephone number and modify the corresponding record.