bvec, a FORTRAN90 code which demonstrates how signed integers can be stored as binary vectors, and arithmetic can be performed on them.
The computer code and data files made available on this web page are distributed under the GNU LGPL license.
bvec is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
SUBSET, a FORTRAN90 code which enumerates, generates, randomizes, ranks and unranks combinatorial objects including combinations, compositions, Gray codes, index sets, partitions, permutations, polynomials, subsets, and Young tables. Backtracking routines are included to solve some combinatorial problems.
UBVEC, a FORTRAN90 code which demonstrates how unsigned binary vectors, strings of 0's and 1's, can represent nonnegative integers or subsets or other mathematical objects, for which various arithmetic and logical operations can be defined.