int rand (int seed)  /* return a 16-bit random number */

The rand function returns a random number in the range 0 to +32767. The random number generator is reinitialized each time a non-zero value is passed in the seed argument. You may use the rand function to delay for a random number of clock cycles or to generate random data to feed into a particular algorithm or input routine.

The rand function returns and int value to the caller.

>rand (0x1234) /* Initialize random generator with 0x1234 */
0x3B98

>rand (0) /* No initialization */
0x64BD