C - structs and unions, C++ classes and polymorphism

For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))

C's structs allow you to define a variable type in which you can hold a variety of elements by name ... and that's very similar to how you define all the variables within a C++ class. In a C++ class, though, you also define your methods which take that language forward into the Object Oriented world.

C's unions let you define a block of memory which has two (or more) names associated with it so that - when combined with structs - you can produce a whole family of defined variable types based on a common core, but then varying in parts where appropriate. In OO terms, that's starting to head towards C++'s inheritance and polymorphism ...
(written 2008-03-13, updated 2008-03-18)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles

C233 - C and C based languages - OO in C++ - beyond the basics
  [798] References and Pointers in C++ - (2006-07-10)
  [801] Simple polymorphism example - C++ - (2006-07-14)
  [831] Comparison of Object Oriented Philosophy - Python, Java, C++, Perl - (2006-08-13)
  [925] C++ - just beyond the basics. More you can do - (2006-11-14)
  [1217] What are factory and singleton classes? - (2007-06-04)
  [1674] What a lot of files! (C++ / Polymorphism demo) - (2008-06-12)
  [1819] Calling base class constructors - (2008-10-03)
  [2577] Complete teaching example - C++, inheritance, polymorphism - (2010-01-15)
  [2845] Objects and Inheritance in C++ - an easy start - (2010-07-01)
  [3056] C++ - a complete example with polymorphism, and how to split it into project files - (2010-11-16)
  [3123] C++ objects - some short, single file demonstrations - (2011-01-07)
  [3124] C++ - putting the language elements together into a program - (2011-01-08)
  [3142] Private and Public - and things between - (2011-01-22)
  [3244] C and C++ - preprocess, compile, load, run - what each step is for - (2011-04-12)
  [3251] C++ - objects that are based on other objects, saving coding and adding robustness - (2011-04-17)
  [3508] Destructor methods in C++ - a primer - (2011-11-05)
  [3811] Associated Classes - using objects of one class within another - (2012-07-21)
  [3979] Extended and Associated objects - what is the difference - C++ example - (2013-01-18)
  [4356] Object factories in C++, Python, PHP and Perl - (2014-12-19)
  [4375] Final examples for 2014 - and a look at our 2015 training course options - (2014-12-31)
  [4377] Designing a base class and subclasses, and their extension, in C++ - (2015-01-01)
  [4559] When do I use the this keyword in C++? - (2015-10-29)
  [4560] Variables, Pointers and References - C and C++ - (2015-10-29)

C209 - C and C based languages - Structures and Unions
  [1478] Some new C programming examples - files, structs, unions etc - (2007-12-19)
  [1584] Using Structs and Unions together effectively in C - (2008-03-21)
  [1669] What are Unions (C programming) - (2008-06-08)
  [2573] C Structs - what, how and why - (2010-01-13)
  [3122] When is a program complete? - (2011-01-06)
  [3145] Structures v Structure Pointers in C. How, which, why. - (2011-01-25)
  [3386] Adding the pieces together to make a complete language - C - (2011-08-11)

Back to
Await guests in the early hours

Previous and next
or
Horse's mouth home

Forward to
Budget tax increases hit vehicle market

Some other Articles

Making PHP and MySQL training relevant to the course delegates
Database design for a shopping application (MySQL)
Joining MySQL tables revisited - finding nonmatching records, etc
Budget tax increases hit vehicle market
C - structs and unions, C++ classes and polymorphism
Await guests in the early hours
London Midland ... Merrymaker ... Percy Danks
I dont care - goodbye
What colour is the season?
Melksham - Swindon. Train v Bus v Car

4759 posts, page by page

Link to page ... 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96 at 50 posts per page

This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

Link to Ezine home page (for reading).
Link to Blogging home page (to add comments).

You can Add a comment or ranking to this page

Like this? ??