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Message: [QUOTE="James Kuyper, post: 3936155"] Meske Moday wrote: .... This program generated precisely the expected warning message when compiled on my machine: ~/testprog(55) gcc -ansi -pedantic -Wall prog-2-1.c -o prog-2-1 prog-2-1.c: In function â€˜mainâ€™: prog-2-1.c:23: warning: passing argument 1 of â€˜printfâ€™ makes pointer from integer without a cast The executable failed in one of the most plausible ways I might have expected: ~/testprog(56) prog-2-1 Enter an integer: 5 Segmentation fault I would expect similar results from the other two assignments. The simplest way I can imagine for such code to compile without warning messages, and to execute in accordance with requirements, as you said it did for you, is if someone has fiddled with the contents of <stdio.h>. However, reality has a better imagination than I do, so it may be something else. [/QUOTE]