下面的程序运行时 怎么出现：No preceeding loop statement那？哪出错了那？请指点一下
def parm
nptabl=7
nprof=10
end
parm
table 1 12 0 18.25 12.5 25 17 35 21 50 24 75 25 150 25
def aux1
loop n(1 , nptabl )
rr=xtable(1,n)
zz=ytable(1,n)
loop k(1,nprof)
case_of k
alfa=0.5*(pi+.1)*float(k-2)/float(nprof-2)
xtable(n+10,k)=rr*cos(alfa)
ytable(n+10,k)=rr*sin(alfa)
case 1
xtable(n+10,k)=rr
ytable(n+10,k)=-40.0
case 2
xtable(n+10,k)=rr
ytable(n+10,k)=0.0
end_loop
end_loop
end_loop
end
aux1
def aux2
command
set grav 0 0 -10
water dens 1000
end_command
loop n (1,nptabl-1)
loop k (1,nprof-1)
xx1=xtable(n+10,k)
yy1=ytable(n+10,k)
zz1=ytable(1,n)
xx2=xtable(n+10,k)
yy2=ytable(n+10,k+1)
zz2=zz1
xx3=xtable(n+11,k+1)
yy3=ytable(n+11,k+1)
zz3=ytable(1,n+1)
xx4=xtable(n+11,k)
yy4=ytable(n+11,k)
zz4=zz3
command
WATER TABLE face xx1,yy1,zz1 xx2,yy2,zz2 xx3,yy3,zz3
WATER TABLE face xx1,yy1 xx3,yy3,zz3 xx4,yy4,zz4
end_command
end_loop
end_loop
end
aux2
ret
