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2576 - What does const mean? C and C++
If you declare a variable to be a const, you're telling the compiler that it's a read-only variable and that it won't be changed throughout its existance. A values that's passed in as a parameter to a function, for example, will be left alone until the function exits. That does not stop you from d ....

2575 - Sharing variables between files of code in C - extern
In C, If you want to share a variable between a number of functions, you can declare it at the top of your file, outside the functions. It's then an element that's held in memory all the time and available to all your functions. Since your functions are separate elements which are joined together ....

2574 - Summary of Wiltshire Core Strategy responses
At the tail end of 2009, I was involved in responding to consultation being run by Wiltshire Council on the future deveopment of Wiltshire, and the towns and villages therein. The headline presentation from Wiltshire Council picked out three places - Chippenham, Trowbridge and "West of Swindon" as ....

2573 - C Structs - what, how and why
If you want to hold a whole series of different values about something in a C program, you'll define yourself a structure (or struct.). You give a type and name to each of the elements in the structure, and then you give an overall variable name to each instance of the struct that you create. Here ....

2572 - The what and why of C pointers
If you put a "*" in front of a variable name as you declare the variable in C, that variable holds the ADDRESS of a value of the type give, rather than the value itself. Thus:   int bill; /* holds an integer */   int *ben; /* holds an ADDRESS. At that address you'll find an i ....

2571 - Reading and writing files in C
In C you can use either open or fopen to open a file. open is what you would use for binary files, and you have plenty of low level controls; use fopen for text files. When you fopen a file, you'll get back a pointer to a structure of type FILE which you then pass into function such as fgets and f ....

2570 - Function Prototypes in C
Programs other than the shortest are name up of named blocks of code (functions) into which parameters are passed and from which results are returned. And rather than have all the functions that make up an application in one file of source, you'll share them between several. That way, maintainabl ....

2569 - How to run a successful online poll / petition / survey / consultation
How can one poll succeed in attracting people to complete it, whereas another is notable because of a lack of votes? 750 people signed up last year to support an online campaign that I 'fronted' on a newly registered domain, from a "standing start". Yet only three people voted in a poll that a use ....

2568 - Forums for your Melksham and open source discussions
Do you have questions you want to ask? Views about Melksham, First Great Western Train services or Open Source languages that you would like to post? If you do / have, you'll be very welcome to join our forums / communities - listed below. Just a word, first, though. There's a minority of intern ....

2567 - Extra MySQL course dates (2 day course, UK)
We've added a MySQL course into our calendar - on Saturday and Sunday 20th and 21st February, at Well House Manor. The course includes a general introduction to SQL, with a slant towards the MySQL flavor, and the principles of database design too ... as well as the installation and configuration of ....

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