C programming - Problems compiling with the %d format specifier

Question

The code example in C which returns the sizeof() in bytes for data types fails to compile w/ %d format specifier. [ clang version 7.0.0; Target: aarch64--linux-android; Thread model: posix; using Termux ]

Clang throws the following warning for each printf statement:
-- format specifies type 'int' but the argument has type 'unsigned long' --

Using the %lu format specifier, as suggested in Clang's output, corrects the warnings thrown by the compiler.

Has anyone experienced a similar issue? Helpful suggestions appreciated!

Answer 1

sizeof returns a number of type size_t, this can have a different underlying type depending on complier and os. Use the format specifier %zd.

Answer 2

Thanks for the assist. Aside from the format specifier %lu working, the %zd specifier returns the expected output as well. Works in Termux and I suspect it will work across platforms - had the same trouble using both CodeBlocks and Bash on Ubuntu on Windows.