unigned __int64 equivalent signed datatype??

[xoinki]

hi all,
I have a 20 digit numeric value.. say 184467440737095 51615..
This i can store if i have unsigned __int64 datatype varible in windows (unsigned long long). I am not able to find out a signed equivalent for data of this magnitude..
Is there any signed equivalent for handling this type of data?

wating for your reply,
Xoinki

[weaknessforcats]

You may need a "big number" library or you can design a C++ class that can handle big numbers stored in an array. That would require overloads for the aritmetcie operators that could perform operations at the binary level across the array.

However, I expect this has already been done.