seed48()
QNX SDP8.0C Library ReferenceAPIDeveloper
Initialize the seed for a sequence of pseudo-random numbers
Synopsis:
#include <stdlib.h>
unsigned short int *seed48(
unsigned short int seed16v[3] );
Arguments:
- seed16v
- An array that comprises the 48 bits of the seed.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
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.
Returns:
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().
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | No |
| Thread | No |
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