So does the big integer class use the CPU's carry flag? I'm picturing an implementation where you chop the dataset into int32_t. Then, for the add operation, each piece is composed of a.int32_t[x]+b.int32_t[x]+carry flag of the previous operation. Does that sound right? If so, I'm wondering how you're using the carry flag. Do you get that using assembly code or is there some standard C/C++ command to give you access to that? (Or would somebody mind taking a second and pointing me to the correct location for the code for that?) Using the above method, I think it would be quite useful to have these dataset types: u/int128_t, u/int192_t, u/int256_t Anyone else agree? ______________________________ Brannon King ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯