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IRAND
— Integer pseudo-random numberIRAND(FLAG)
returns a pseudo-random number from a uniform
distribution between 0 and a system-dependent limit (which is in most
cases 2147483647). If FLAG is 0, the next number
in the current sequence is returned; if FLAG is 1, the generator
is restarted by CALL SRAND(0)
; if FLAG has any other value,
it is used as a new seed with SRAND
.
This intrinsic routine is provided for backwards compatibility with
GNU Fortran 77. It implements a simple modulo generator as provided
by g77
. For new code, one should consider the use of
RANDOM_NUMBER as it implements a superior algorithm.
GNU extension
Function
RESULT = IRAND(I)
I | Shall be a scalar INTEGER of kind 4. |
The return value is of INTEGER(kind=4)
type.
program test_irand integer,parameter :: seed = 86456 call srand(seed) print *, irand(), irand(), irand(), irand() print *, irand(seed), irand(), irand(), irand() end program test_irand