How many bytes is unsigned long long

Question

How many bytes is unsigned long long  Is it the same as unsigned long long int

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Executive summary  it s 64 bits  or larger   unsigned long long is the same as unsigned long long int  Its size is platform-dependent  but guaranteed by the C standard  ISO C99  to be at least 64 bits  There was no long long in C89  but apparently even MSVC supports it  so it s quite portable   In the current C   standard  issued in 2003   there is no long long  though many compilers support it as an extension  The upcoming C  0x standard will support it and its size will be the same as in C  so at least 64 bits   You can get the exact size  in bytes  8 bits on typical platforms  with the expression sizeof unsigned long long   If you want exactly 64 bits  use uint64 t  which is defined in the header  lt stdint h gt  along with a bunch of related types  available in C99  C  11 and some current C   compilers

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The beauty of C    like C  is that the sized of these things are implementation-defined  so there s no correct answer without your specifying the compiler you re using  Are those two the same  Yes   long long  is a synonym for  long long int   for any compiler that will accept both

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It must be at least 64 bits   Other than that it s implementation defined   Strictly speaking  unsigned long long isn t standard in C   until the C  0x standard   unsigned long long is a  simple-type-specifier  for the type unsigned long long int  so they re synonyms    The long long set of types is also in C99 and was a common extension to C   compilers even before being standardized

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Use the operator sizeof  it will give you the size of a type expressed in byte  One byte is eight bits  See the following program    include  lt iostream gt   int main int char       std  cout  lt  lt   unsigned long long    lt  lt  sizeof unsigned long long   lt  lt    n    std  cout  lt  lt   unsigned long long int    lt  lt  sizeof unsigned long long int   lt  lt    n    return 0

[c++] How many bytes is unsigned long long?

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