These pages concern a computer programming language called "C". There are many example programs with output. To see the list of examples, click the "Examples" box above (requires JavaScript).

• A C Unicode and UTF-8 library (29 December 2020)
• C implementation of the Fisher-Yates shuffle (12 August 2018)
• An example of using pipe and fork in C (18 December 2017)
• The Boyer-Moore string matching algorithm in C (28 May 2017)
• Parse and create HTTP format timestamps in C (5 March 2017)
• An example of atexit in C (25 February 2017)
• List of allocating C functions (10 February 2017)
• Get the line number of a regex match (10 February 2017)
• Distinguish binary and text files in C (2 February 2017)
• Example implementation of the Knuth-Morris-Pratt algorithm in C (30 January 2017)
• Remove unnecessary #include headers from C files (7 December 2016)
• Test the size of integers in the preprocessor (29 November 2016)
• A C program which gets information about itself (20 October 2016)
• An example of Cairo and FreeType in C (6 October 2016)
• Get the file number associated with a FILE pointer (14 August 2016)
• Simple C macros for the Test Anything Protocol (29 July 2016)
• An example of using va_copy (29 July 2016)
• Example of reading a PNG file (23 June 2016)
• Example of calling printf from assembly on FreeBSD (9 November 2015)
• C and Go equivalents (14 September 2015)
• C program to delete files which match a pattern (4 April 2015)
• Negative numbers and the modulo operator in C (8 August 2014)
• An example of using malloc (7 March 2013)
• Convert an IP address to an integer in C (25 February 2013)
• How to block all internet traffic from China (11 February 2013)
• C example program for hello world (7 February 2013)
• Similarities and differences between pointers and arrays in C (19 November 2012)
• An example of mmap for a read-only file (3 August 2012)
• Using a C structure as a Perl object with XS (7 July 2012)
• Levenshtein edit distance with a maximum (23 June 2012)
• Print system limits from limits.h (26 May 2012)
• Print part of a string with printf (3 May 2012)
• C string libraries (23 November 2011)
• Algorithm to convert katakana to hiragana in UTF-8 (30 September 2011)
• Strip leading and trailing space in C (26 September 2011)
• Calculate the Levenshtein edit distance in C (20 September 2011)
• Regular expressions to match C grammar (14 September 2011)
• Print today's date in C (12 September 2011)
• An example of pointer arithmetic (11 September 2011)
• Read a compressed file with gzFile, gzopen, and gzread in C (9 September 2011)
• Open and read a gzip compressed file with zlib in C (9 September 2011)
• An example of compressing with zlib in C (9 September 2011)
• Example of insertion sort in C (8 September 2011)
• Example of quicksort in C (7 September 2011)
• Program to reverse a string without using the string library (7 September 2011)
• Techniques for avoiding problems in C programming (6 September 2011)
• C programming language forum (31 August 2011)
• Mathematical constants in C provided by math.h (25 August 2011)
• Calculate Armstrong numbers in C (19 August 2011)
• Convert decimal to binary in C (19 August 2011)
• Find the largest of n numbers in C (19 August 2011)
• Pointers in C with examples (18 August 2011)
• Generate a Fibonacci series in C (18 August 2011)
• List the files in a Unix directory with C (18 August 2011)
• Example program in C to detect palindromes (18 August 2011)
• Get a list of prime numbers in C (18 August 2011)
• Recursively list directories in C (18 August 2011)
• Fetch a web page using C (17 August 2011)
• Example of C if statement (17 August 2011)
• Compare strings ignoring case in C (17 August 2011)
• An example of an inline qsort (17 August 2011)
• Example of random number generation in C (17 August 2011)
• Example of C switch (17 August 2011)
• Example of typeof to make a "swap" macro. (17 August 2011)
• Example of command-line arguments in C (13 August 2011)
• Get the size of a file in C (13 August 2011)
• Example of getopt in C (13 August 2011)
• Read a whole file into memory in C (13 August 2011)
• Set and get environment variables in C (13 August 2011)
• Binary search in C using bsearch (10 August 2011)
• Show the types of all the ASCII characters (10 August 2011)
• Example of a doubly-linked list in C (10 August 2011)
• Find a substring of a string in C (10 August 2011)
• Example of a singly-linked list in C (10 August 2011)
• An example of array initialization in C (9 August 2011)
• Length of array in C (9 August 2011)
• Sort an array of strings in C (9 August 2011)
• C string array initialization (9 August 2011)
• Printf, doubles and decimal places (9 August 2011)
• Join an array of strings to a single string (9 August 2011)
• Print hexadecimal versions of numbers in C (9 August 2011)
• Left-justify printf output (9 August 2011)
• Convert a string to a double in C (9 August 2011)
• Convert a string to an integer in C (9 August 2011)
• Open a file in C (1 August 2011)
• Web sites about C (27 July 2011)
• Stupid mistakes in C programming (22 June 2011)
• An example of using regular expressions in Perl XS (18 June 2011)
• The C string library (30 May 2011)
• Make a reentrant parser with Flex and Bison (26 May 2011)
• Programming UNIX Sockets in C - Frequently Asked Questions (24 May 2011)
• C macros __LINE__, __FILE__ and __func__ (14 May 2011)
• Get a hash value using XS (30 March 2011)
• The mysterious case of the missing Base64 library (27 March 2011)
• Split a C string on whitespace (20 February 2011)
• Detect Shift-JIS bytes in a stream of bytes (1 January 2011)
• Set the modification time of a PNG (29 December 2010)
• Converting Cairo output to PNG (28 December 2010)
• Create a PNG with text segments (28 December 2010)
• Write a PNG file using C and libpng (27 December 2010)
• Using Unicode with Perl XS (24 December 2010)
• Perl XS (23 December 2010)
• Detecting FILE * buffering (12 December 2010)
• Detecting whether a file is seekable (12 December 2010)
• What characters are illegal in a Unix filename? (9 November 2010)
• Allowed variable names in C (4 November 2010)
• C function pointer to function with varying number of arguments (28 October 2010)
• Listing available typefaces with Pango (18 October 2010)
• Get the full file name of the current executable on Unix (8 October 2010)
• Find the source code of a library function in FreeBSD (8 October 2010)
• Add the location of a shared library when compiling (8 October 2010)
• Xlib window which tells its own position and size (3 October 2010)
• Responding to resize events with Xlib (3 October 2010)
• A simple text window using Xlib (3 October 2010)
• Responding to window deletion messages from the window manager (3 October 2010)
• Display CGI environment variables (27 September 2010)
• SQLite C example: bind data (20 September 2010)
• An example of using regular expressions in C (14 September 2010)
• An example of ualarm and setjmp (12 September 2010)
• A simple "die" function for C - example of variable number of arguments (11 July 2010)
• Web log timestamp to Unix epoch with strptime (11 July 2010)
• SQLite C example: insert data (9 June 2010)
• SQLite C example: select data (9 June 2010)
• Comparison of CGI libraries in C (23 May 2010)
• Example of ptrace for FreeBSD (30 October 2009)
• Get the current working directory in Unix in C (10 October 2009)
• Approximate length of a cubic bezier curve (30 September 2009)
• Useful tools for C programmers (12 September 2009)
• An example of iconv (9 September 2009)
• HTTP status codes as C defines (7 September 2009)
• Get information on network interfaces in FreeBSD (6 September 2009)