Hi Nitin,
>Flexible arrays are indeed legal.
Incorrect: they are not legal in C++98 nor C++03, and they are unspecified behavior for C89 (and, hence, not necessarily portable).
I presume they are "indeed legal" for C99 (I haven't programmed in C since 1990, so I'm out of the loop). But you were not asking about C99, you were asking about C++.
>I thought C++ is a superset of C and C code should compile in a C++ compiler (except for strict type checking) ..but guess not.
C++98 is *MOSTLY* a superset of C89.
C99 diverges even further from C89; and thus, further divergence and discrepancies from C++98 (or C++03).
The C99 standardization committee made it clear that they are not beholden to C++-isms in determining the best course-of-evolution in steering / developing / improving the C standards.
>gcc 3.3.3 compiles it just fine. g++ 3.3.3 doesnt.
GCC for C code (and the appropriate flags) compiles C code as per the C99 (ISO 9899:1999 specification).
GCC for C++ code (and the appropriate flags) compiles C++ code pretty darn close to C++03 (ISO 14882:2003 specification).
Those flags being such things as -pedantic, -ansi, -std={something}, -trigraphs, et cetera.
HTH, --Eljay
