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A general explanation of specific task functions.

Prerequisite material

Critical to this module is the review of two Connexions modules:

  1. m_18861 – Titled: Modularization and C++ Program Layout
  2. m_19145 – Titled: Program Control Functions

You should review these materials before proceeding. If you are viewing this module on-line, links to these items are in the "Links" box to your right.

General concept

Program Control functions which might have similar identifier names usually perform slightly different tasks in one program to another. Looking at the organizational chart or hierarchy chart for two companies, both might have a vice president of production, but producing automobiles is different than producing ice cream. Similar but different. As you go down deeper into an organization you might find the job title of security guard. Notice that the security guard at the automobile plant and the security guard at the ice cream plant have exactly the same job. In fact, they are most likely interchangeable. Within programming when a task gets specific it might be useable in several programs. The calculation of leap year is a good example. Needed for the verification of dates, is there or is there not a 29 th of February for this year. Needed in thousands of programs.

Specific task functions

To create good Specific Task functions you need to do all communication needed via parameter passing. Thus all programs that will use the function will communicate in precisely the same way. In our leap year example, you would communicate into the function the year and the function would return the communication of true or false; meaning it is a leap year and there is a 29 th of February (true) or it is not a leap year (false).

The ability to modularize our program into specific task functions means that we can write the specific task function once making sure it works correctly, then reuse it over and over in many programs. As you can guess there is a balance. Most programs will have some program control functions and some specific task functions. The key to deciding if the function should be a specific task function is usually rooted in the uniqueness of the task so that it can be used in many programs. Specific task functions once created are usually placed into a user defined library then shared with others for use in many programs.


user defined library
A file containing specific task functions created by individuals to be used in many programs.

Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
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Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
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for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
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Sanket Reply
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Damian Reply
types of nano material
abeetha Reply
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Sravani Reply
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preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
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silver nanoparticles could handle the job?
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I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
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Prasenjit Reply
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Source:  OpenStax, Programming fundamentals - a modular structured approach using c++. OpenStax CNX. Jan 10, 2013 Download for free at http://cnx.org/content/col10621/1.22
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