自定义5个函数，实现与5个C标准库函数（pow、tolower、toupper、exp、sin）相同的功能-DIY five functions to realize the same function of the five basic library functions（pow、tolower、toupper、exp、sin）

标准c语言大数运算函数库，并附应用实例rsa加密程序。参考afanty编写适用与MFC的BigInt库。-Standard library c language operator of large numbers, with application examples rsa encryption. Reference afanty prepared for the BigInt with the MFC library.

C++编写的椭圆函数库标准DLL及测试例子-C++ elliptic function libraries written in standard DLL and test case