Python, Lua and Tcl - public course schedule [here]
Private courses on your site - see [here]
Please ask about maintenance training for Perl, PHP, Java, C, C++, Ruby, MySQL and Linux / Tomcat systems
String formatting in Lua - string.format as a wrapper for sprintf
Lua is a small language - and so for some elements of its functionallity it uses wrappers around underlying C functions rather than re-implementing and duplicating logic. A good example is the string.format function which in essence is a wrapper around sprintf.
thing = string.format("> %8.2f > %d",person,person)
• using the string template which is the first paramater of the function call, substitute a floating point number 8 characters wide, of which two characters are afer the decimal point, into the first place holder and a decimal (base 10) integer as many characters wide as it needs to be into the second placeholder, and store the resulting string into a variable called thing
• then output the contents of the variable called thing, adding a new line onto the end.
This may feel a bit clunky and old fashioned but it works very well. And the Lua wrapper saves you all the extra work of declaring and allocating memory for the variable called thing, adding the new line, ensuring you have space for a null terminator too. And it save you the heartache of scratching your head while you debug if you have forgotten to allocate the memory of leave space for the terminator.
Another very simple and logical solution from Lua ... we teach Lua [descriptions]
... and there's an example from a past course with some more formatting examples [here]
. Further string format examples [here]
. (written 2014-05-07)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesU104 - Lua - Strings and the String library. 
Dynamically formatting your results (Lua) - (2009-11-10) 
Checking if the user has entered a number (Lua) - (2009-08-13) 
Finding literals rather than patterns in Lua - (2009-08-11) 
Lua examples, Lua Courses - (2008-08-08)
Some other Articles
Future Swindon - Westbury train services. At current level into the future?Sending a message to the server and changing text on a page when a button is pressedSwindon to Weymouth - by train, the traditional way - 2014Eurpoean Elections, and other elections ahead. Some thoughts on campaigns and policiesString formatting in Lua - string.format as a wrapper for sprintfDot or Colon separator between table name and member in Lua - what is the difference?Lazy operators in Lua - what they mean, and examplesLine, block and nested comments - Lua compared to other languagesEmbedding Lua to perform tailored code at an intervalSurvey - Journeys
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
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).