In C99 #include <stdbool.h> has the type bool and the constants true and false (even in the "freestanding" flavor). Of course this doesn't save you if you are d

In C99 #include <stdbool.h> has the type bool and the constants true and false (even in the "freestanding" flavor). Of course this doesn't save you if you are dealing with old/non-conformant compilers and/or legacy codebases.