Arbitrary-precision Arithmetic


 * ubasic implementation
 * faster than lukewarn C implementation
 * reference to get C/C++ arbitary precision arithmetic library

overflow

 * detecting overflow with template
 * paper about integer overflow
 * Catching Integer Overflows in C
 * things to take care about bit shift

Boost.MultiPrecision

 * document
 * number reference

Ruby

 * Integer
 * latest implementation
 * Bignum
 * Fixnum