Correct printf format specifier for size_t: %zu or %Iu?

Question

I want to print out the value of a size_t variable using printf in C++ using Microsoft Visual Studio 2010 (I want to use printf instea

Answer 1

The Microsoft documentation states:

The hh, j, z, and t length prefixes are not supported.

And therefore %zu is not supported.

It also states that the correct prefix to use for size_t is I – so you'd use %Iu.