init_input Subroutine

  subroutine init_input
    !! Initialise module variables
    implicit none

    error = .False.
    show_changes = 0
    constraints_exist = .false.
    line = ""
    linelen = 0
    lineno = 0
    iptr = 0
    infile = 0
    outfile = 0
    report_changes = 0
    icode = 0
    subscript_present = .false.
    error_message = ""
  end subroutine init_input