The following C console application is a simple concept of how atm and abm would function. Basically, the console app manipulates data using sequential and random access files by giving the users options to do so, as if it's a real-time banking app. This article is useful for both beginners and intermediate developers who are interested in using c-objective programming skills and techniques such as declaring variables, manipulating data by sequential and random access files , calling functions, passing values or references, and the use of pointers, etc. The code will help developers test and understand C programming concepts.