C rand() and random() functions

There are two primary random functions to be aware of in stdlib.h: random() and rand() the main difference is in the range of values returned by the two functions.

random() returns a pseudo random number in the range 0 -> 0x7FFFFFFF = 0 -> 1,879,098,192 (RANDOM_MAX).
rand() returns values in the range 0 -> 0x7FFF = 0 -> 28,672 (RAND_MAX).

I had mistakenly been using one in place of the other in some micro-controller code and had spent some time wondering why it wasn't behaving as expected...