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program zivot
parameter (ndim=20,mdim=20,nborn=2,nmin=2,nmax=5)
character*1 a(ndim+2,mdim+2),anew(ndim+2,mdim+2),atmp(mdim+2)
do 10 i=1,ndim+2
do 15 j=1,mdim+2
a(i,j)=' '
anew(i,j)=' '
15 continue
10 continue
do 16 i=2,mdim+1
a(1,i)='-'
a(ndim+2,i)='-'
16 continue
do 17 i=2,ndim+1
a(i,1)='|'
a(i,mdim+2)='|'
17 continue
a(1,1)='+'
a(ndim+2,mdim+2)='+'
a(1,mdim+2)='+'
a(ndim+2,1)='+'
c write(*,*) 'pocet zivocichov:'
write(*,*) 'number of animals:'
read(*,*) nziv
do 20 i=1,nziv
c write(*,*) 'pozicia',i,'. zivocicha:'
write(*,*) 'position of',i,'th animal:'
read(*,*) ii,jj
a(ii+1,jj+1)='#'
20 continue
do 22 i=1,ndim+2
do 24 j=1,mdim+2
atmp(j)=a(i,j)
anew(i,j)=a(i,j)
24 continue
write(*,*) atmp
22 continue
read(*,*)
1 do 30 i=2,ndim+1
do 32 j=2,mdim+1
nneigh=0
do 34 ii=i-1,i+1
if (a(ii,j-1).eq.'#') nneigh=nneigh+1
if (a(ii,j+1).eq.'#') nneigh=nneigh+1
34 continue
if (a(i-1,j).eq.'#') nneigh=nneigh+1
if (a(i+1,j).eq.'#') nneigh=nneigh+1
if (a(i,j).ne.'#') then
if (nneigh.eq.2) then
anew(i,j)='#'
else
anew(i,j)=' '
endif
else
if ((nneigh.gt.nmax).or.(nneigh.lt.nmin)) then
anew(i,j)=' '
else
anew(i,j)='#'
endif
endif
32 continue
30 continue
do 40 i=1,ndim+2
do 45 j=1,mdim+2
atmp(j)=anew(i,j)
a(i,j)=anew(i,j)
45 continue
write(*,*) atmp
40 continue
read(*,*)
goto 1
100 format(a80)
stop
end
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