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Bad suffix on number error

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I'm trying to get some c++ code I've found on the net to work in MSVC++ and i'm getting a 'bad suffix on number' error.

See below 3 lines where there's an number format I'm not familiar with each ending in 'U' which the compiler doesn't like. Please could someone advise of the correct MSVC++ format for these and maybe point me in the direction of an explanation of what these numbers mean.

Thanks !! :-)

uint64_t x1 = x - ((x & 0xAAAAAAAAAAAAAAAALLU) >> 1);
uint64_t x2 = (x1 & 0x3333333333333333LLU) + ((x1 >> 2) & 0x3333333333333333LLU);
uint64_t x3 = (x2 + (x2 >> 4)) & 0x0F0F0F0F0F0F0F0FLLU;

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ull or llu stands for unsigned long long. I would advise you to use a mixed capitalisation when using this on a hex number just so you can easily see where the hex value stops and where the number suffix starts.

http://msdn.microsoft.com/en-us/library/00a1awxf%28v=vs.80%29.aspx link on the syntax MSVC uses for it's integral suffix parsing.

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