[ Arithmetic | The ECLiPSe Built-In Predicates | Reference Manual | Alphabetic Index ]
random(?N)
Generates a random integer N.
- ?N
- Integer or Variable.
Description
random/1 unifies N with a random integer between 0 and 2^31-1
(returned by the C library function random(), whose initialization
has been made using the pid of the running ECLiPSe ).
If it is required that the sequence produced by successive calls of
random/1 be reproducible, seed(Seed) can be called to initialise the
calls with the integer Seed.
Fail Conditions
None.
Resatisfiable
No.
Exceptions
- (5) type error
- N is instantiated, but not to an integer.
Examples
Success:
[eclipse]: random(N1), random(N2).
N1 = 464880439
N2 = 285401533
yes.
[eclipse]: seed(1), random(N).
N = 2078917053
yes.
[eclipse]: seed(1), random(N).
N = 2078917053
yes.
Fail:
random(12345).
Error:
random(12.34). (Error 5).
See Also
frandom / 1, seed / 1