searching in the file

[khaled mohamed hassan]

hello every body , if we suppose that i have a file in c++ . in this file a lot of names and in front of each name its ID . my problem is how to search in the file by ID
and when i search by ID , it must be appeared the name of this ID . ??????

[moorecm]

Model the data into a type, load the data into memory via a container of objects, and perform the searches. A std::map<int, string> or similar might be a good start.