请教关于gfortran的输出问题！
我用gfortran运行一段程序，用输出语句write(*,*)老是有问题，请高手指点！程序如下：
program test_sbhdl
implicit doubleprecision (a-h,o-z)
! Variables
character algorithm*3,direction*1,vc
dimension a(6),ica(6),ira(0:4),ncqa(1,4)
dimension ncqsub(1)
common nout
! Body of test_sbhdl
nout=20
write(*,*)"aaa"
open(unit=nout,file="information.txt",status="unknown",form="formatted")
ma=6;msa=4;nsa=4;mncq=1
a(1)=0.25d0;a(2)=-0.25d0;a(3)=0.5d0;a(4)=0.5d0;a(5)=-0.25d0;a(6)=0.25d0
ica(1)=1;ica(2)=2;ica(3)=3;ica(4)=2;ica(5)=3;ica(6)=4
ira(0)=0;ira(1)=1;ira(2)=3;ira(3)=5;ira(4)=6
ncqa(1,1)=2;ncqa(1,2)=0;ncqa(1,3)=0;ncqa(1,4)=-2
write(*,*)"bbb"
open(unit=6,file="HBL002",status="unknown",form="unformatted")
write(*,*)"ccc"
write(6)ma,msa,nsa,mncq
write(6)ncqa
write(6)a
write(6)ica
write(6)ira
close(6)
end
其中，前两个write(*,*)可以在屏幕上打印出来，而第三个有问题。
出错信息：
At line 24 of file 666.f90
Fortran runtime error: Format present for UNFORMATTED data transfer
我文件名取的是666.f90
同样是这段程序用compag visual fortran 运行就没问题。
我想不通是什么问题，请高手指点！ open(unit=6,file="HBL002",status="unknown",form="unformatted")
我把unit=6改成unit=4就没有错误了，
难道unit=6有特殊的用途？还是编译器的bug? Unit numbers 0, 5, and 6 are associated with the standard error, standard input (keyboard), and standard output files (screen)
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