chrpak

chrpak, a C code which can handle 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

• string '31.2' <=> numeric value 31.2;
• uppercase <=> lowercase;
• removal of control characters or blanks;
• sorting, merging, searching.

Many of the routine names begin with the name of the data type they operate on:

• B4 - a 4 byte word;
• CH - a character;
• CHVEC - a vector of characters;
• DEC - a decimal fraction;
• DIGIT - a character representing a numeric digit;
• I4 - an integer;
• R4 - a real;
• R8 - a double precision real;
• RAT - a ratio I/J;
• S - a string;
• SVEC - a vector of strings;
• SVECI - a vector of strings, implicitly capitalized;

Licensing:

The computer code and data files described and made available on this web page are distributed under the MIT license

Languages:

chrpak is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and an Octave version and a Python version.

Related Software and Data:

caesar, a C code which can apply a Caesar Shift Cipher to a string of text.

chrpak_test

rot13, a C code which makes a copy of a file which has been encoded using the ROT13 coding, and a ROT5 coding for digits.

Reference:

1. Carl Branden, John Tooze,
   Introduction to Protein Structure,
   Second Edition,
   Garland Publishing, 1999,
   ISBN: 0815323050,
   LC: QP551.B7635.
2. Paul Bratley, Bennett Fox, Linus Schrage,
   A Guide to Simulation,
   Second Edition,
   Springer, 1987,
   ISBN: 0387964673,
   LC: QA76.9.C65.B73.
3. IEEE Standards Committee 754,
   IEEE Standard for Binary Floating Point Arithmetic,
   ANSI/IEEE Standard 754-1985,
   SIGPLAN Notices,
   Volume 22, Number 2, 1987, pages 9-25.
4. Donald Knuth,
   The Art of Computer Programming,
   Volume 3, Sorting and Searching,
   Second Edition,
   Addison Wesley, 1998,
   ISBN: 0201896850,
   LC: QA76.6.K64.
5. Albert Nijenhuis, Herbert Wilf,
   Combinatorial Algorithms for Computers and Calculators,
   Academic Press, 1978,
   ISBN: 0-12-519260-6,
   LC: QA164.N54.

Source Code:

• chrpak.c, the source code;
• chrpak.sh, compiles the source code;
• chrpak.h, the include file;