Extra C99 Keywords
When the C99 extensions setting is on, the compiler recognizes extra keywords and the language features they represent. The following table lists these keywords.
Table 1. Extra C99 Keywords
This keyword or combination of keywords...
represents this language feature
_Bool
boolean data type
long long
integer data type
restrict
type qualifier
inline
function qualifier
_Complex
complex number data type
_Imaginary
imaginary number data type