Does GCC support long long int?

Question

Does GCC support:

long long int

which would be a 64-bit integer?

Also, is long long int part of the standard?

Answer 1

long longs are well supported, and have been for a long long time [sorry]. As I understand it, this should have been 128 bit on 64-bit platforms, but for compatibility/portability reasons in GCC, has standardised on a 64-bit width.

See also: (u)int128_t, and this discussion on GCC's 128-bit integer support