Program to access file system, C/C++ Programming

Assignment Help:

The program must use the file named on the command line as its input file. Suppose the program is named pdbtool. Then if the user types pdbtool 1A36.pdb the program must read the data in 1A36.pdb. If the file argument is missing, or if the file does not exist or cannot be opened for reading, the program should quit with an appropriate error message. The program should be robust enough that if the file is not a PDB file, it will not crash. This will require no extra effort if the program is designed to look only for the ATOM and HETATM records in the file. The program can assume that all ATOM records are in the correct format; it does not have to check that the lines follow that format.

The program should read the data in the PDB file, and for each distinct atom in the file, store a record for that atom in an array of atom records. The program can assume that the file contains only a single model, and that each ATOM record in the file identifies a distinct atom. For each atom, the program will need to store:

_ The atom's serial number

_ The three-letter name of the amino acid to which it belongs (e.g., ARG)

_ The atom's three coordinates (x,y,z)

_ The atom's one- or two-letter element name (e.g. C, O, N, Na)

After reading all of the data the program must display a message indicating how many atom records were created, such as 5285 atoms recorded.

The program will prompt the user to enter a command, with a short and simple prompt such as

command:

The user will be allowed to enter one of the following commands:

freq

length

density d

quit

If the user enters _freq_ the program displays, for each distinct element in the _le, a line of the form element: n where n is the number of atoms of that element. Sample output could be same.


Related Discussions:- Program to access file system

Data structure, Project Description: Project is related indexing data re...

Project Description: Project is related indexing data related some data structure. I need to share all information related project later if i contact any body Skills required

Decode the code, Smugglers are becoming very smart day by day. Now they hav...

Smugglers are becoming very smart day by day. Now they have developed a new technique of sending their messages from one smuggler to another. In their new technology, they are send

Explain reusability, Reusability  Reusability means reusing code writte...

Reusability  Reusability means reusing code written earlier, may be from some earlier project or from the library. Reusing old code not only saves development time, but also sa

Structure, railway reservation programming

railway reservation programming

Explain the polymorphism in object-oriented programming, Problem: (a) ...

Problem: (a) A GUI can contain text-fields, buttons, and other labels. A button usually triggers an event on the GUI. Explain the different processes in registering an event

Create a programming system, Your task is to create a programming system fo...

Your task is to create a programming system for a ferry. The ferry transports passengers and vehicles (cars, busses, lorries and bicycles). The ferry has space for 200 passengers a

I want auto-rank script, Project Description: I play this game called mo...

Project Description: I play this game called mobstar (mobstar) and I would like the program to grade my account for me. It would require doing a crime, GTA, jail busting, lead a

Basics, conceptual difference between big o,big thete and big omega

conceptual difference between big o,big thete and big omega

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd