Ordering of boolean values

Question

Under C++ or from C99, how is the less-than operator < defined for boolean values?

Alternatively, explain the behaviour of

Answer 1

For C++ just false < true

For C is more difficult to answer. I see

typedef char _Bool; /* For C compilers without _Bool */ in my stdbool.h

Seems, that if compiler support _Bool , it works as in C++ and automatically converts to 0/1, but if not it should work as char and it'll be b < true, b < false if char is signed

For me (int)(bool) -1 is 1 even in C, so bool is defined as not char