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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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))
Passing arrays into functions in C

When passing arrays into functions in C, you can specify just the array name and C will pass in a pointer to the first element of the array (i.e. &abc[0] is the same as saying just abc ). Within your functions, you can then use array style notation with square brackets, or pointers.

There's an example from the C course I'm running at the moment - [here] ... main code is

  main(){
  
    int stock[10];
    int k;
  
    for (k=0; k<10; k++) stock[k] = 100;
  
    int bobBuys[10];
    for (k=0; k<10; k++) bobBuys[k] = 0;
    bobBuys[4] = 50;
    bobBuys[6] = 10;
  
    updateStock(stock,bobBuys);
  
    showStock(stock);
  
}


You'll note how an apparently basic facility turns out to be rather elegant in how it calls up functions to ooerate on arrays as a whole, aided by the fact that passing an array is the same as passing the address of the first element.

Jelly Bean Picture? The example is all about stock levels and sales of Jelly beans

(written 2014-12-02)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
C205 - C and C based languages - Arrays
  [1614] When an array is not an array - (2008-04-17)
  [2002] New C Examples - pointers, realloc, structs and more - (2009-01-20)
  [2840] Just pass a pointer - do not duplicate the data - (2010-06-30)
  [3118] Arrays of arrays - or 2D arrays. How to program tables. - (2011-01-02)
  [3121] New year, new C Course - (2011-01-05)
  [3144] Setting up arrays in C - fixed size at compile time, or dynamic - (2011-01-24)
  [3245] Collections in C and C++ - arrays, vectors and heap memory blocks - (2011-04-12)
  [4566] C - why is slow to write and debug) but fast to run? - (2015-11-01)

C204 - C and C based languages - Functions, Macros and programs in multiple files
  [775] Do not duplicate your code - (2006-06-23)
  [1163] A better alternative to cutting and pasting code - (2007-04-26)
  [1478] Some new C programming examples - files, structs, unions etc - (2007-12-19)
  [2570] Function Prototypes in C - (2010-01-11)
  [2575] Sharing variables between files of code in C - extern - (2010-01-14)
  [2841] C Course exercise and sample answer - source in 2 files - (2010-06-30)
  [3237] Using functions to keep look and feel apart from calculations - simple C example - (2011-04-09)
  [3717] Returning extra results from a function in C - (2012-05-03)
  [3721] Naming blocks of code, structures and Object Orientation - efficient coding in manageable chunks - (2012-05-06)
  [4554] Passing information into functions in C - by name, by value - (2015-10-26)
  [4555] Preprocessor directives in C and C++ - what they mean - (2015-10-27)
  [4557] Function prototype - what they are and why you should use them - C and C++ - (2015-10-27)


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Command line and file handling in C
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Passing arrays into functions in C
Learning to program sample program - past its prime, but still useful
Test Driven Development - a first example of principle in C
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Splitting out code into name blocks for clarity and reusability
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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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