Try compiling.

Unsigned long long I；;

I know it hasn't appeared yet.

After the popularization of 64-bit XP, it is estimated that there will be a new version of MS VC++.

Mac and Linux are included in some C++ compilers. For example:

/macosx/64bit.html

/infocenter/lnxpcomp/v8v 10 1/index . JSP？ topic =/com . IBM . xlc P8 l . doc/compiler/ref/BIF _ int . htm

This is not only a question of defining 64-bit unsigned integer variables, but also a series of 64-bit operation (internal function) programs need to be developed. At present, I can only write by myself, what to do with 64-bit operation and what to write.