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C and C based languages module C205
Arrays
Exercises, examples and other material relating to training module C205. This topic is presented on public courses Learning to Program in C, Learning to program in C and C++, Programming in C, C and C++ Programming, Learning to program in C and C++, C and C++ Programming

Background
If you want to hold a who table of different pieces of information under a single variable name, you can use an array. This module deals with the declaration of arrays in C, and how you write programs that will step through and handle each element of the array in turn without having to duplicate code.
Articles and tips on this subjectupdated
4566C - why is slow to write and debug) but fast to run?
I often say on my courses that you can write code in a morning in Perl, Python or Ruby that would tae a week in C. How come, and why would anyone use C these days? Firstly, C is the underlying language on which others are built. We need it there in the background, even if we don't (ourselves) code ...
2015-11-01
 
4338Passing 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 ...
2014-12-02
 
3245Collections in C and C++ - arrays, vectors and heap memory blocks
If you want to hold multiple values within a table in a program, you'll want to use some form of collection or table - and in many languages including C++ and C, the most straightforward type of collection is an array. An array occupies sequential locations in the computer's memory when your program ...
2011-04-12
 
3144Setting up arrays in C - fixed size at compile time, or dynamic
You can store a whole series of data values of the same type in an array in C. The easiest way to declare an array is something like:   int history[20]; and that will give you an array of 20 elements - which you can refer to as elements number 0 to 19, so:   history[4] = 1234; to ...
2011-01-25
 
3121New year, new C Course
Well - not completely a new course. New delegates, and lots of new examples written for them during the first day to that they can see not only WHAT work but also HOW the design of what works is put together during the day. Click on the individual source code examples, and you'll find programs to ...
2011-01-08
 
3118Arrays of arrays - or 2D arrays. How to program tables.
It's shorthand when you're learning a new programming language to ask "how does it handle multiple dimension arrays" ... but in practise very few languages actually support true multidimensional arrays these days, and in those which do you might be well advised to use an alternative that's more flexible. What ...
2011-01-03
 
2840Just pass a pointer - do not duplicate the data
When you want to pass a big bundle of data - such as an array - into a function, it's far more efficient to pass in just a single value in the form of a pointer to the array. That's the address in memory at which the array starts and that single value can provide the key to all the data without havig ...
2010-06-30
 
2002New C Examples - pointers, realloc, structs and more
Every time I program in C, I marvel at how clever the language is ... yet at the same time I curse some of the devices that are used to perform certain actions, which make the code that much more of a 'puzzle' to right. I've finished a 2 day C Programming course today ... and written a whole raft ...
2009-01-20
 
1614When an array is not an array
An array, I was taught, is a sequential series of memory locations in which values of some type are stored. In an array, each of the memory locations is the same size (number of bytes). And so, as I was taught, arrays can be used very efficiently using pointer arithmetic, BUT they need to: a) Be defined ...
2008-04-19
 
Examples from our training material
abits.c   extern - a global variable
abits.h   header file for global variable demo
afp.c   Pointers and Arrays - Interaction
amain.c   Use of constants and globals
arr1.c   Arrays - triangle numbers
arrbad.c   Arrays - triangle numbers WITH ERROR
eleven.c   Array - declaration, filling with data, reusing
lp.c   declaring an array and defining its length
makefile   makefile for module C205
morearr.c   Arrays - days and months
pa2.c   Passing an array to a function - (2)
pa3.c   Allocating heap memory and passing to a function
paif.c   Passing an array to a function - (1)
par.c   pointers v arrays
rainfall.txt   Sample rainfall data (1) - always 31 days of data
series.c   read array, print in reverse, min and max
Background information
Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from [here].
Topics covered in this module
Declaring and initialising an array
Techniques for iterating through an array
Complete learning
If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

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