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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | C
C Demonstrates the use make_sprng_seed
C 'make_sprng_seed' is used to produce a new seed each time the program is
C run. Then a few random numbers are printed.
C
C Uncomment the following line to get the interface with pointer checking
C #define CHECK_POINTERS
program seedf
implicit none
#include "sprng_f.h"
integer streamnum, nstreams, seed, i, junk
SPRNG_POINTER stream
real*8 rn
C--- reading in a generator type
integer gtype
#include "genf_types_menu.h"
print *,'Type in a generator type (integers: 0,1,2,3,4,5): '
read *, gtype
C---
streamnum = 0
nstreams = 1
C generate a new seed each time program is run and initialize stream
seed = make_sprng_seed()
stream = init_sprng(gtype,streamnum,nstreams,seed,SPRNG_DEFAULT)
print *, 'Printing information about new stream'
junk = print_sprng(stream)
print *, 'Printing 3 random numbers in [0,1):'
do 100 i = 1, 3
rn = sprng(stream)
write(*,"(f8.6)") rn
100 continue
junk = free_sprng(stream)
end
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