Initialize the seed for a sequence of pseudo-random numbers
#include <stdlib.h>
unsigned short int *seed48(
unsigned short int seed16v[3] );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The seed48() initializes the internal buffer r(n) of drand48(), lrand48(), and mrand48(). All 48 bits of the seed can be specified in an array of 3 short integers, where the entry with index 0 specifies the lowest bits. The constant multiplicand and addend of the algorithm are reset to the defaults: the multiplicand a = 0xFDEECE66D = 25214903917 and the addend c = 0xB = 11.
A pointer to an array of 3 shorts which contains the old seed. This array is statically allocated, thus its contents are lost after each new call to seed48().
| Safety: | |
|---|---|
| Cancellation point | No |
| Interrupt handler | No |
| Signal handler | No |
| Thread | Yes |