Julia C constant equivalent

New to Julia
3

I’m not sure anything particular is required for such cases? For example:

julia> x = typemax(UInt64)
0xffffffffffffffff

julia> (x >> 63)  | 0x8000000000000000
0x8000000000000001

In Julia integer literal are automatically given a “big enough” type, at least up to 128-bit. So 0x8000000000000000 is a UInt64. You can request a specific type by writing e.g. UInt128(0x8000000000000000). But you get UInt128 automatically if you write a larger literal integer:

julia> typeof(0x1000000000000000000000000000000)
UInt128
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