The difference of int8_t, int_least8_t and int_fast8_t?

Question

What is the difference between the int types int8_t, int_least8_t and int_fast8_t?

Answer 1

These are related to the size of the integer and are just what they sound like.

int8_t is exactly 8 bits
int_least8_t is the smallest int type that has at least 8 bits
int_fast8_t is the fastest int type that has at least 8 bits.