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I just wrote a simple C++ program in Visual Studio 2010 and I use ceil function. But I forgot to include the <cmath> and only included the <iostream>. Surprisingly my code compiled successfully and ran without any error. I read a C++ book and it clearly says that to use ceil function you must include <cmath> or <math.h>. Why this happens? Can anyone explain me? Thanks!
The header is indirectly included from some other (indirectly) included header.
To find out which one, enable ‘keep preprocessed source’ (
/P) from the project options and inspect the resulting (*.i) fileUpdate Just found out that VS2010 has renamed the related option: