几个大数计算库 Mark下==============================
GMP: GNU Multiple Precision Arithmetic Library
http://gmplib.org/
IMath: Arbitrary Precision Integer and Rational Arithmetic
http://spinning-yarns.org/michael/sw/imath/
CLN: Class Library for Numbers
http://www.ginac.de/CLN/
BigDigits multiple-precision arithmetic source code
http://www.di-mgt.com.au/bigdigits.html
NTL: A Library for doing Number Theory
http://www.shoup.net/ntl/
TTMath: a bignum library for C++
http://ttmath.slimaczek.pl/ttmath
MIRACL: Multiprecision Integer and Rational Arithmetic C/C++ Library
http://www.shamus.ie/
更多信息: 维基百科
http://en.wikipedia.org/wiki/Bignum