Home Accessibility Courses Twitter The Mouth Facebook Resources Site Map About Us Contact
 
For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
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)


Back to
References and Pointers in C++
Previous and next
or
Horse's mouth home
Forward to
Effective web campaign?
Some other Articles
Not shouting
undefined reference to typeinfo - C++ error message
Simple polymorphism example - C++
Effective web campaign?
The case for exceptions
References and Pointers in C++
Writing up new C / C++ notes.
Busy day in Melksham
Remember a site's non-technical issues too
Perl delegate - much more than just a delegate
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

© WELL HOUSE CONSULTANTS LTD., 2021: 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho

PAGE: http://www.wellho.net/mouth/799_The- ... tions.html • PAGE BUILT: Sun Oct 11 16:07:41 2020 • BUILD SYSTEM: JelliaJamb