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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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))
The case for exceptions

When you run a program, things can go wrong - run time errors. And no amount of coding by the programmer can prevent these things - it  [82][ac] Ä s a user entering a string of text when a number  [82][ac] Ä s required, a needed file having been deleted, or a network connection that  [82][ac] Ä s broken that causes probems.

In traditional coding, it  [82][ac] Ä s standard practise to check for as many of these errors as you can throughout your code, and this often results in a few lines of live code being wrapped in 4 or 5 times that number of lines of error checking ... which catch most but still not all of the errors that may occur.

Exceptions are provided in many modern OO languages - they  [82][ac] Ä re in more recent C++ compilers, for example, as well as in languages like Python and Java. They let you write code where you don  [82][ac] Ä t write the detail of checking for each possible error yourself - rather, you code for the working case and you enclose anything that may go wrong into a try block. Then you provide one or more catch blocks to set up actions that are to be taken if the try block failed to complete.

Great system; often less coding, and with a tendency to fail safe if error conditions that you  [82][ac] Ä ve not explicitly coded for crop up.
(written 2006-07-11)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
C236 - C and C based languages - Exceptions
  [1875] What are exceptions - Python based answer - (2008-11-08)
  [2622] Handling unusual and error conditions - exceptions - (2010-02-03)
  [3068] Throwing your own exception in C++, and catching it - (2010-11-24)
  [3509] Operator Overloading, Exceptions, Pointers, References and Templates in C++ - new examples from our courses - (2011-11-06)


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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.

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