demo_noesc.f90

     program demo_noesc

      use M_strings, only : noesc
      implicit none
      character(len=128) :: ascii
      character(len=128) :: cleared
      integer            :: i
      ! fill variable with base ASCII character set
      do i=1,128
         ascii(i:i)=char(i-1)
      enddo
      cleared=noesc(ascii)
      write(*,*)'characters and their ADE (ASCII Decimal Equivalent)'
      call ade(ascii)
      write(*,*)'Cleared of non-printable characters'
      call ade(cleared)
      write(*,*)'Cleared string:'
      write(*,*)cleared
      contains
        subroutine ade(string)
        implicit none
        ! the string to print
        character(len=*),intent(in) :: string
        ! number of characters in string to print
        integer :: lgth
        ! counter used to step thru string
        integer :: i
           ! get trimmed length of input string
           lgth=len_trim(string(:len(string)))

           ! replace lower unprintable characters with spaces
           write(*,101)(merge(string(i:i),' ',&
           & iachar(string(i:i)) >= 32        &
           & .and.                            &
           & iachar(string(i:i)) <= 126)      &
           & ,i=1,lgth)

           ! print ADE value of character underneath it
           write(*,202)     (iachar(string(i:i))/100,    i=1,lgth)
           write(*,202)(mod( iachar(string(i:i)),100)/10,i=1,lgth)
           write(*,202)(mod((iachar(string(i:i))),10),   i=1,lgth)
        ! format for printing string characters
        101   format(*(a1:))
        ! format for printing ADE values
        202   format(*(i1:))
        end subroutine ade
      end program demo_noesc