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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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)) |
Incrementing a variable in Java - Pre and Post Increment
Java (and C, Perl and PHP) supports the ++ operator to increment a variable - in other word, do add 1 to the value it holds and save the reult back in the same place.
You can write
counter++;
or
++counter;
and as statemnets on their own, they'll do the same thing.
However, embed them with another statement and it does make a differene.
another = summat++;
is different to
another = ++summat;
Both of these increment the variable summat, but what get stored into another will differ.
• With ++ after the variable name, the extra 1 is added after the other uses of that variable in the line - in other words, another gets set to the original value of summat
• With ++ before the variable name, the extra 1 is added before the other uses of that variable in the line - in other words, another gets set to the new value of summat
With the ++ in front, it's know as pre-increment - increment before other use
With the ++ behind, it's know as post-increment - increment after other use
Sample of that it use - [here] from the current Java course (written 2014-12-08, updated 2014-12-09)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles J703 - Java - Variables [127] Conversion and coercion in Java - (2004-11-22) [1448] Question on division (Java) - Also Perl, PHP, Python ... - (2007-11-28) [2148] Variable scope in Java Servlets and other web applications - (2009-05-01) [2153] Class Loading and Variable Conversion in Java - (2009-05-02) [3038] Setting up individual variables, and arrays, in Java - some commented examples - (2010-11-09) [3041] Java - basic rules for arithmetic, variables and conversion - (2010-11-10) [3278] Do I need to initialise variables - programming in C, C++, Perl, PHP, Python, Ruby or Java. - (2011-05-05) [3365] Turning bright delegates into bright and knowledgable ones - (2011-07-21) [3917] BODMAS - the order a computer evaluates arithmetic expressions - (2012-11-09) [4324] Learning to program - variables and constants - (2014-11-22)
Some other Articles
When I am old, what will worry me?Taking my life in my hands in SwanseaArrays in Java - an introduction for newcomersA behaviour driven example of writing a Java programIncrementing a variable in Java - Pre and Post IncrementPython base and inherited classes, test harness and unit testing - new examplesPolitics and the railway the connects WiltshireMy first official measure - Passenger Entrys and Exits - revisited 9 years laterSegmentation Fault, Segmentation Violation, Bus Error, Stack Smashing Command line and file handling in C
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