int i = ceil(2.9f);
printf("i is: %d\n", i);
I had compiled the code using the command cl test.c, clean compile no warnings, no messages, after running the program the result was: i is: 1024. WTF?!
The proper compile command cl /W4 test.c returned this:
test.c(5) : warning C4013: 'ceil' undefined; assuming extern returning int
C assumes a bit too much.
Next time I want to try a code snippet I won't use the .c extension, I'll use .cc, one character makes a big difference:
test.cc(5) : error C3861: 'ceil': identifier not found
D'oh, I forgot to #include <math.h>!