rand, srand - pseudo-random number generator (int)

Syntax	#include <stdlib.h> int rand(void); void srand(unsigned int seed);
Description	rand() returns a positive random integer in the range [0, 215-1]. A rand call selects values from a series of pseudo-random numbers by using a multiplicative, congruent random-number generator. The generator has a period of 232. rand() is not thread-safe. Use the reentrant function rand_r() when needed.
Return val.	Random number in the range [0, 215-1] if successful.
Notes	The random-number generator can be initialized or reset with srand(). If no initialization takes place, the random-number generator starts with its default value.
See also	drand48(), rand_r(), random(), srand(), stdlib.h.