For 2023 - 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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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 Course exercise and sample answer - source in 2 files
Here's a sample exercise from the C course ... set yesterday to tailor the course for the particular group of delegates that we have this week:
/* Complete my program ...
... in 2 files
... fixed VAT rate at compile time
Function params - cost per item (net) and
no. of items at this cost
tc is gross.
items = 0;
tc = 0.0
tc += vatable(17.6,2);
tc += vatable(18.4,4);
tc += vatfree(19.5,3);
printf ("............", items, tc);
You'll work out from the pseudocode that items
needs to be a global variable - and that really the vatable
functions should be in a separate file. That brings function templates and extern
into play in the example.
Solution - source code of main file [here]
and of the the functions [here]
The compile line to build the application under gcc would be as follows:
gcc -o xrcz xrcz.c taxi.c
or to separate out the compiles:
gcc -c taxi.c
gcc -c xrcz.c
gcc -o xrcz xrcz.o taxi.o (written 2010-06-30)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesC204 - C and C based languages - Functions, Macros and programs in multiple files 
Do not duplicate your code - (2006-06-23) 
A better alternative to cutting and pasting code - (2007-04-26) 
Some new C programming examples - files, structs, unions etc - (2007-12-19) 
Function Prototypes in C - (2010-01-11) 
Sharing variables between files of code in C - extern - (2010-01-14) 
Using functions to keep look and feel apart from calculations - simple C example - (2011-04-09) 
Returning extra results from a function in C - (2012-05-03) 
Naming blocks of code, structures and Object Orientation - efficient coding in manageable chunks - (2012-05-06) 
Passing arrays into functions in C - (2014-12-02) 
Passing information into functions in C - by name, by value - (2015-10-26) 
Preprocessor directives in C and C++ - what they mean - (2015-10-27) 
Function prototype - what they are and why you should use them - C and C++ - (2015-10-27)
Some other Articles
Objects and Inheritance in C++ - an easy startLearning about Regular Expressions in C through examplesString functions in CStaring a C course with Hello World - why?C Course exercise and sample answer - source in 2 filesJust pass a pointer - do not duplicate the dataSoftware versions used - June 2010Respecting our customers anonimityLorry Parking in MelkshamPerl - the duplicate key problem explained, and solutions offered
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This is a page archived from The Horse's Mouth at
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