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What is the difference between unsigned long and UINT64?
I think they are the same, but I'm not sure.
The definition of UINT64 is :
typedef unsigned __int64 UINT64
(by using StdAfx.h)
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h> header) defines uint64_t as unsigned long long , because unsigned long isn't wide enough. In 64-bit mode, it defines uint64_t as unsigned long . It could have defined it as unsigned long long in both modes. The choice is arbitrary; all that's required is that it has to be a 64-bit type.
The UInt64 value type represents unsigned integers with values ranging from 0 to 18,446,744,073,709,551,615. Important. The UInt64 type is not CLS-compliant. The CLS-compliant alternative type is Decimal. Int64 can be used instead to replace a UInt64 value that ranges from zero to MaxValue.
A unsigned long long int is not standardised across all systems so the size can change depending on the system running the code. A uint64_t is standardised in c++ and guarantees 64bits of storage, you need to include stdint. h to use it though.
Int64 is used to represents 64-bit signed integers . UInt64 is used to represent 64-bit unsigned integers.
UINT64 is specific and declares your intent. You want a type that is an unsigned integer that is exactly 64 bits wide. That this may be equal to an unsigned long on some platforms is coincidence.
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