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3397 - Does a for loop evaluate its end condition once, or on every iteration?
All the languages that we teach have a for loop or the equivalent, which is a clean way of repeating a block of code with a rising or falling index number. It's used in many circumstances - for example in iterating through the months of the year (for m goes from 1 to 12) of in stepping through all ....

3396 - Tables as Objects in Lua - a gentle introduction to data driven programming
In Lua, everything that's a collection is held in a table. During the Lua Course I have been giving this week, I set up a whole series of tables, object-like, to hold details of each station on the British main rail network. As well as data, the table holds code / code references, and by adding dif ....

3395 - Parallel but not really parallel. Moving game characters. Coroutines in Lua.
Virtual World game programming involves moving many characters - both player controlled and automatic - in parallel. The movements of each character depend - to a greater or lesser extent - on the prior movements of the character, and of the other charcaters and the resultant position and condition ....

3394 - The difference between lists and strings - Tcl
There's not much difference between lists and strings in Tcl. In fact a list is just a string in a particular format, and if you split a string that contains just letters and spaces into a "list" you may not change anything AT ALL. Which means that if you make a coding error you may not spot it u ....

3393 - Rodwell Trail, Weymouth
Yesterday ... more to do in Weymouth. I'll probably be there again for the next two Sundays, and certainly not running out of things to see and do. The Rodwell Trail is the path of the old railway from Weymouth via Wyke Regis to Fortuneswell and Easton. Dominic, Sion and myself took the walk t ....

3392 - What costs 8.20 from Melksham, or 22.30 via Chippenham?
If I were to commute to Swindon for a day's work from Melksham, I would much prefer to travel by train from my home town of Melksham. It's kinder on the environment, and it's kinder on my blood pressure (I can relax on the train but should not relax at the wheel), and it's kinder to others on the ....

3391 - For programmers who use Internet Explorer as their browser
Our web site includes over 4000 (I couldn't believe that figure either when I looked it up) source code, configuration file and data file examples. And today, following an idea from a delegate on last weeks' C++ course, I have improved the display of them on Internet Explorer with a more friendly la ....

3390 - Printing objects in C++
Overloading operators with methods is a great way of providing a shorthand using the operator syntax for common things you want to do with objects. In other words - it's much easier to write:   c = a + b than   c = a.addition(b) ans it's also much easier for the maintainanc ....

3389 - Plenty to do in Melksham
Someone said to me that there's nothing to do in Melksham. But I don't believe them - I don't share that experience. In fact, I could do with 48 hours in the day to do all the things that I wanted. On Monday of this week, I was teaching a programming course (open to the public) - and I'm teaching ....

3388 - Templates in C++ - defining a family pattern of methods / functions
In C, function names need to be unique. If you try to compile or load two functions of the same name, even with a different number / type of parameters, you'll get an error rather than a runnable file out of your compile / load process. See [here]. In C++, you can have methods (functions) in each c ....

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