Exercises, examples and other material relating to training module C206. This topic is presented on public courses Learning to Program in C, Learning to program in C++, Programming in C, C and C++ Programming

As well as doing calculations on numbers, you'll want your program to be able to handle strings of text - things like names and addresses and product codes ... and HTML tags and SQL queries too, perhaps. C defines strings as char[] types, and there's a whole raft of standard functions that are available to work on strings.

Articles and tips on this subject		updated
3593	Chars, char arrays and strings in C. Some early cautions and pitfalls. A char in C is a single byte variable, and a string in an array of chars (i.e. a series of chars held in successive memory addresses) and terminated by a null (\0). Because of this need for a terminator, you need to allocate one ADDITIONAL byte of memory / character position than the maximum number ...	2012-01-28
3144	Setting 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
3146	Strings in C Strings in C are null terminated char arrays ... so you always need to allocate one more array member for them than the maximum possible length - to hold a string of up to 20 chars, you need an array of 21. Double quoted string constants are null terminated strings, and if you assign them to a variable, ...	2011-01-25
3122	When is a program complete? "Code is never completed ... it can always be improved." ... it's one of the most difficult aspects in many projects to say "yes, that does what we want and we should go for a release now rather than continuing to develop until ... until it's so late that we've missed the boat / added too much complexity ...	2011-01-08
2844	Learning about Regular Expressions in C through examples Although we more usually teach Regular Expressions on courses on Perl, Python, PHP, Ruby, etc ... there is also a standard C library, which uses the POSIX flavour of regular expressions, and I've put a short example together to "show you how". Firstly - what is a regular expression? It's a "pattern ...	2010-06-30
2843	String functions in C A String is a NUL terminated array of chars. Remember to allow space in the string for the NUL, and for any new line character you may have too, if you dimension it manually. And remember to add a NUL back on to the end if you extend a string by adding individual characters to it. There are lots of ...	2010-06-30
1338	Handling Binary data in Tcl (with a note on C) In Tcl, all variables are held as strings, and most of the commands will split / divide strings at new line or space characters by default. However, there are a few commands that do NOT make that distinction and since a Tcl string (Unlike a C string) may contain any bit pattern at all, they provide a ...	2007-09-11

chout.c	Strings v chars
cli.c	Command Line Handling
cli2.c	Command line - use of pointers example
cli3.c	Command line params - more complex character string arrangement
cli4.c	Picking out command line options into an array
cli5.c	More advanced coding style to handle argv and argc
cs1.c	Comparing strings in C
csame.c	Comparisons of strings in C
cstr.c	String manipulation in C
cx.c	String copying and manipulation
dynamic.c	memory allocation and release with calloc and free
dynbad.c	How NOT to do it - overrunning an array
fff	Some sample data
makefile	makefile for module C206
pothat.c	Strings via pointers and arrays of chars
rabbit.c	Structures and file i/o - C
range.c	Summing numbers from the command line
readwrite.c	File handling basics in C
reg.c	Regular Expression matching in C
reg2.c	Match and Capture - Regular Expressions
sti1.c	Characters and strings in C