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Manual Reference Pages  - read (7fortran)

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NAME

read(7f) - [IO] read data

SYNOPSIS

DESCRIPTION

OPTIONS

EXAMPLES

Sample:

       program testit
       use,intrinsic :: iso_fortran_env, only : stdin=>input_unit
       implicit none
       character(len=:),allocatable :: line
       character(len=*),parameter   :: gen=’(*(g0))’
       integer                      :: ichars=0, ilines=0, ilength=0, ios
          open(unit=stdin,pad=’no’)
          READFILE: do
             call getl(line,ios)
             if(ios.ne.0)exit READFILE
             ilines=ilines+1
             ilength=len(line)
             ichars=ichars+ilength
             write(*,’(i9,i9,i9,"[",a,"]")’)ichars,ilines,ilength,line
          enddo READFILE
          write(*,gen)’CHARS+LINES=’,ichars+ilines
       contains
       subroutine getl(line,ios)
       use,intrinsic :: iso_fortran_env, only : iostat_eor, iostat_end, &
        & stderr=>error_unit
       character(len=:),intent(out),allocatable :: line
       integer,intent(out) :: ios
       character :: a*1,msg*256
          line=’’
          READLINE: do
             read(stdin,advance=’no’,iostat=ios,fmt=’(a)’,iomsg=msg) a
             select case(ios)
             case(IOSTAT_END);              exit READLINE
             case(IOSTAT_EOR); ios=0;       exit READLINE
             case(0);          line=line//a
             case default
                write(stderr,gen)’LINE ’,ilines,’ ERROR:’,trim(msg)
                exit READLINE
             end select
          enddo READLINE
       end subroutine getl
       end program testit

SEE ALSO

BACKSPACE(7), CLOSE(7), ENDFILE(7), FLUSH(7), INQUIRE(7), OPEN(7), PRINT(7), READ(7), REWIND(7), WAIT(7), WRITE(7)

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