Algorithms and Source Code

Textual Algorithms

Ordinal suffix	Defines the ordinal suffix of a number, in english. Source
Roman to natural	Algorithm converting roman numbers into decimal numbers. Source
Natural to Roman	Converts natural numbers into roman notation. Source
Words	Counts words in a text file. Source
Booklet and header	C algorithm to print a booklet or a book.
Plural	Just two C macros to convert word to plural.

Mathematical Algorithms

Combinations	Calculates the number of combinations of n items, m times. Source.
Factorial	Algorithm calculating factorials. Source.
Fibonacci - Iterative	Fibonacci's suite. Source.
Fibonacci - Recursive	Recursive version of the algorithm. Source.
GCD	Greatest common divisor to two integers.
Median	The median is the most probable value in a list.
Prime Factors	Prime factors of an integer or a list of integers. Source.
Radian	Converts between radians and degrees.

Answers by Algorithms

Body Mass	Formulas to calculate the body mass according to height and weight, and the ideal weight. Source
Body Mass Europa	Same as above, height in centimeters, weight in kilogs. Source
Calendar	Algorithm displaying the calendar for a given month. Source
Convert Any	Convert anything, km, yards, kg, etc... Source
Day of week	Formula to know the day of week for a given date. Source
Inches	Converts inches to feets and inches.

Algorithms on Lists and Arrays

Binary search	Find quickly a value in a sorted list.
Merge Sort	Sorting array of integer. Source
Quick sort integers	Sorting array of integers. Source
Quick sort generic	Sorting array of any type of variables.

Graphical Algorithms

Links
GreyCStoration	Restore pictures and photos. Usable to denoise, inpaint and resize images.
Origin3D	Algorithm to build a landscape.
FAQ	Answers about graphical algorithms.
Colorization	Colorize B&W images and videos
Planarity	Boyer-Myrvold planarity algorithm.

Algorithms for the Programmer's Library

Array Of Bits	Store economically boolean value into array of integers, as backend. Source
Curly braces	Algorithm testing source file for unmatched curly braces.
Day of week	Know the day of week for a given date. Source
Directory Tree	Display content of directory and sub-directories. Recusive algorithm. Source
Plural	Just two C macros to make words plurals.
Random Generator	Simple random number generator demo (see also built-ins rand and randomize). Source.
To Unix	Convert a DOS or Windows text file to Unix. (Replace CR+LF by LF). Source.
Links
Programmers' algorithms	Miscellaneous algorithms.
Path Conversion	Convert between absolute and local paths.
Dictionary of algorithms	List of algorithms.