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jihe01

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FUNCTION RAN1(IDUM)


      DIMENSION R(97)                                         
      PARAMETER(M1=259200,IA1=7141,IC1=54773,RM1=1./M1)
      PARAMETER(M2=134456,IA2=8121,IC2=28411,RM2=1./M2)
      PARAMETER(M3=243000,IA3=4561,IC3=51349)
      
          DATA IFF/0/

      IF(IDUM.LT.0.OR.IFF.EQ.0) THEN
        IFF=1
        IX1=MOD(IC1-IDUM,M1)
        IX1=MOD(IA1*IX1+IC1,M1)
        IX2=MOD(IX1,M2)
        IX1=MOD(IA1*IX1+IC1,M1)
        IX3=MOD(IX1,M3)

        DO 11 J=1,97
        IX1=MOD(IA1*IX1+IC1,M1)
        IX2=MOD(IA2*IX2+IC2,M2)
        R(J)=(real(IX1)+real(IX2)*RM2)*RM1
   11   CONTINUE
        IDUM=1.0
      ENDIF

      IX1=MOD(IA1*IX1+IC1,M1)
      IX2=MOD(IA2*IX2+IC2,M2)
      IX3=MOD(IA3*IX3+IC3,M3)
      J=1+(97*IX3)/M3
      IF(J.GT.97.OR.J.LT.1)PAUSE
      RAN1=R(J)
      R(J)=(real(IX1)+real(IX2)*RM2)*RM1

      RETURN
      END function
101Â¥2011-04-11 15:24:00
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maomao1210

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ÒýÓûØÌû:
Originally posted by jihe01 at 2011-04-11 15:24:00:
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jihe01

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qwer_2009

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program main
implicit none
type node
real x   !ÉèÖÃËæ»úÊý
type(node),pointer::next
end type
type(node),pointer::head,q,p
real rand
integer i,j
integer::m=0,n=0


call random_seed( )
nullify(head)


do i=1,10
call random_number(rand)
allocate(q)
q%x=rand
q%next=>head
head=>q
end do

q=>head
do while(associated(q))
print*,q%x
q=>q%next
end do

!ÅжÏÊÇ·ñ´óÓÚ0.50
q=>head

do while(associated(q))


if(q%x<0.50.and.associated(q,head))then
n=n+1  !ÅжÏСÓÚ0.5µÄ¸öÊý
head=>q%next
deallocate(q)
q=>head
else if(q%x<0.50.and..not.associated(q,head))then
n=n+1
p=>q%next
deallocate(q)
q=>p
else
m=m+1
q=>q%next
end if

end do


write(*,*) "´óÓÚ0.5µÄ¸öÊým=", m
write(*,*) "СÓÚ0.5µÄ¸öÊýn=", n

!Êä³ö´óÓÚ0.5µÄÊý
q=>head
do while(associated(q))

print*,q%x
q=>q%next
end do

end

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