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Fortran 77 program to extract column data-help

Fortran 77 program to extract column data-help

Fortran 77 program to extract column data-help

I need some help with modifying a code in fortran 77. This program is supposed to skip the first two lines and the last line of the sample data and then extract only the date from the date column and write it to an output text file. The program I have now manages to skip the first two lines and extract the column but I cannot seem to figure out how to skip the last line. Any help would be appreciated. As I indicated I have very little programming experience. Thanks.


Date     Data    
mm/dd/yyyy    units    
01/01/0001     3.08E+02    
01/02/0001     9.50E+01    
01/03/0001     5.80E+01    
01/04/0001     4.60E+01    
01/05/0001     3.90E+01    
01/06/0001     3.30E+01    
01/07/0001     3.00E+01    
01/08/0001 2.90E+01    
01/09/0001     2.70E+01    
01/10/0001 2.50E+01    
Total 6.90E+02    

Program edate
implicit none
character*10 eDate
integer x,y
integer lntop
integer lnend

lnend = 12
lntop = 2

open(unit=5, file="datafllow.txt")

do x=1,lntop

do y=1,lnend
read(5,1010) eDate
write(6,1020) eDate


1000 format(1x)
1010 format(a10)
1020 format (a10)

RE: Fortran 77 program to extract column data-help

Is it as simple as
lnend = 10

Or am I missing something?

RE: Fortran 77 program to extract column data-help

You have several options:
>  Read to the end of the file to find the end of file, then re-read until the next to the last line

>  If you already know the size of the file, then, as posted above, you read one less line

>  Do as you did before, except that you save the data into an array, and write out one fewer line

I don't really see much programming difficulty with any of the options.


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RE: Fortran 77 program to extract column data-help

You could try using end=


      do x=1,lntop

10    continue
         read(5,1010, end=20) eDate
         write(6,1020) eDate
         goto 10
20    continue


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