Don't overread the FAQ. It says nothing whatsoever about scanf.

I would love to explain a bit just to settle your concern. printf does not
need to distinguish float's and double's as scanf does. According to what
the C language standard terms "default argument promotion", any float
matching against an ellipsis ("...") is implicitly promoted to double. So
whether you pass a float or double to printf, it will always see a double.
Therefore, it does not need a long modifier to distinguish the two types.

> My experiences told me...
> For the new compiler(s)...
> 
>       Read          Write
> G++:   %lf         %f
> C++:   %lf         %lf / %f

• Thanks!! (636) knhung 2009-05-21 01:29:18