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C ____Demonstrates converting code to SPRNG____
C
C The original random number call is to 'myrandom'. We change it to
C call SPRNG by defining a macro.
C
C The lines between the '#ifdef CONVERT' and the '#else' are the
C newly added lines. Those lines between the '#else' and the '#endif'
C are theoriginal lines that need to be deleted.
program sprngf_simple
implicit none
#define CONVERT
#ifdef CONVERT
#define SIMPLE_SPRNG
#include "sprng_f.h"
#define myrandom sprng
SPRNG_POINTER junkPtr
#else
external myrandom
real*8 myrandom
#endif
real*8 rn
integer seed, irn, i, junk
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---
seed = 985456376
#ifdef CONVERT
C initialization
junkPtr = init_sprng(gtype,seed,SPRNG_DEFAULT)
print *, 'Printing information about new stream'
junk = print_sprng()
#else
C Old initialization lines
#endif
print *, 'Printing 3 double precision numbers in [0,1): '
do 100 i = 1, 3
rn = myrandom()
print *,i, rn
100 continue
end
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