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What will be the output of printf("%d"); or printf("%p"); statement?
Of course I know that I should pass argument as printf is expecting one but assuming that I will leave this empty what will happen?
I know that this will print some value read from stack (from the place where function argument should be placed). Assuming that I am running Linux machine can I expect that this will be some valid value (e.g. function return address)?
This is simply undefined behaviour. Anything could happen. It’s impossible to give a more accurate answer.
The details depend on how
printfis implemented by the library, and how variable arguments are implemented by your compiler. Look at the source of the library and/or the generated assembly to find out what’s happening on your platform.