ubvec, a C 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.
The computer code and data files made available on this web page are distributed under the MIT license
ubvec is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
BVEC, a C code which demonstrates how signed integers can be stored as binary vectors, and arithmetic can be performed on them.
SUBSET, a C 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.