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C Library Functions  - number_of_lines (3)

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NAME

number_of_lines(3f) - [M_io:QUERY] read an open sequential file to get number of lines (LICENSE:PD)

CONTENTS

Synopsis
Description
Options
Returns
Examples
Author
License

SYNOPSIS

function number_of_lines(lun) result(nlines)

   integer,intent(in)          :: lun
   integer                     :: nlines

DESCRIPTION

Rewind an open sequential file and read through it to count the number of lines. The file is rewound on exit. If it is not readable -1 is returned.

OPTIONS

lun	logical unit number of open sequential file to count lines in.

RETURNS

nlines	number of lines read. If it is not readable -1 is returned.

EXAMPLES

Sample program

   program demo_number_of_lines
   use M_io,      only : number_of_lines, fileopen
   implicit none
   integer :: ios
   integer :: lun
      lun=fileopen(’test.txt’,’r’,ios)
      if(ios == 0)then
         write(*,*) number_of_lines(lun)
      else
         write(*,*)’ERROR: IOS=’,ios
      endif
   end program demo_number_of_lines

AUTHOR

John S. Urban

LICENSE

Public Domain

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Nemo Release 3.1

number_of_lines (3)

June 29, 2025

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