C - LeMoDa.net

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)