Anthony Shipman <als@xxxxxxxxxxxx> writes: > Oh, I missed that bit in the middle. Is that the C standard or just how Gnu C > does it? It is the C standard. Note that this is implemented in the C library, which is not part of GCC. > Do you know if libstdc++ uses exactly the same specification or perhaps > delegates to printf()? (I started off searching for how the C++ "general" > format was defined). libstdc++ delegates to printf. Ian