rand(3)
Name
rand, srand − random number generator
Syntax
#include <stdlib.h>
void srand(seed)
unsigned seed;
rand()
Description
The newer random() should be used in new applications. The rand subroutine remains for compatibility.
The rand subroutine uses a multiplicative congruential random number generator with period 232 to return successive pseudo-random numbers in the range from 0 to 231−1.
The generator is reinitialized by calling srand with 1 as argument. It can be set to a random starting point by calling srand with whatever you like as argument.
Environment
For the System V environment, the rand subroutine returns numbers in the range from 0 to 215−1.