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I've read several articles on this topic, but some say that the way it should be done depends on the architecture and system you're in (Windows/Linux), so is there a proper way to do this platform independent?

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  • C99 specifies the zu format specifier Commented Dec 25, 2016 at 11:43
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    I think Microsoft has finally caught up with the standard %zu in VS2015. Commented Dec 25, 2016 at 11:49
  • Use "%zu", "%zo", "%zx", or "%zX" depending on what base you prefer. Commented Dec 25, 2016 at 14:43

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%zu for size_t, with

  • %z for length, and
  • %u for unsigned

Details can be found at

7.21.6.1 The fprintf function

6 The flag characters and their meanings are:

...

z Specifies that a following d, i, o, u, x, or X conversion specifier applies to a size_t or the corresponding signed integer type argument; or that a following n conversion specifier applies to a pointer to a signed integer type corresponding to size_t argument.

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