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a beginner's question, input/output of fortran

a beginner's question, input/output of fortran

Below is my code, ef.txt is the file with my data. I do not know why the code below can only generate the files before the ef part. So if I run the code below, there is no error message but only mu.txt and mu2.txt appear in the folder. mu1 cannot be found in the folder...why..I really cannot figure out.

implicit none
integer :: i
real*8, dimension(3) :: eta

do i = 1,3
write(21,187) i, i+1
187 format(i5,i5)
end do

do i = 1,3
write(24,13) i, i+1
13 format(i5,i5)
end do

do i = 1,3
read(2,8) eta(i)
8 format(f18.10)
end do

do i = 1,3
write(23,12) i, i-1
12 format(i5,i2)
end do

end program Source1

RE: a beginner's question, input/output of fortran

IMO, you have problem reading the file ef.
Try to read without the format 8, simply
read(2,*) eta(i)

RE: a beginner's question, input/output of fortran

Typically when you open a file FORTRAN positions it so that you can write new rows at the end. Do the following to get it to the beginning

rewind 2
do i = 1,3
read(2,8) eta(i)
8 format(f18.10)
end do

You can also tell it you only want to read the file. You do this by the following code

open(2,file='ef.txt',form='formatted',STATUS='OLD', ACTION='READ') )
do i = 1,3
read(2,8) eta(i)
8 format(f18.10)
end do

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