Florian Hengstberger wrote:
We are OT, anyway...
Following is possible with gcc and g++:
These are two quite different cases: gcc is normally for C, g++ for C++. Contrary to what many people believe, they are two very different languages.
#include <math.h>
If you are using C++ you should not #include <math.h>, but #include <cmath>
double sin(double) { return 1; }
Why I don't get any warnings like: sin prevously defined in math.h ...
Mainly because it isn't. In math.h (or cmath) sin is only declared, not defined.
There might possibly be other reasons: like the fact that in C++, provided you correctly included <cmath> and not <math.h>, the standard sin will be in namespace std, not in the global one.
Why is it possible to overwrite the definition of sin, is this part of the standard?
Again, you are providing *a* definition; there is no previous one at this point to override.
Secondly the definition (not declaration) of double sin(double) misses a variable!
You are not missing any variable; you are merely not assigning it any name.
> Is this ok, when the variable is not referenced in the code?
Exactly.
bye
av.
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