Using %f to print an integer variable

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From the latest C11 draft — §7.16 Variable arguments <stdarg.h>:

§7.16.1.1/2

...if type is not compatible with the type of the actual next argument 
(as promoted according to the default argument promotions), the behavior 
is undefined, except for the following cases:

— one type is a signed integer type, the other type is the corresponding 
unsigned integer type, and the value is representable in both types;
— one type is pointer to void and the other is a pointer to a character type.

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