CHRPAK, a FORTRAN90 code which handles characters and strings.
CHRPAK began when I simply wanted to be able to capitalize a string. Now it has expanded to a number of interesting uses. Many unusual situations are provided for, including
Many of the routine names begin with the name of the data type they operate on:
The computer code and data files made available on this web page are distributed under the GNU LGPL license.
CHRPAK is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
CAESAR, a FORTRAN90 code which can apply a Caesar Shift Cipher to a string of text.
ROT13, a FORTRAN90 code which can encipher a string using the ROT13 cipher for letters, and the ROT5 cipher for digits.