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EX05: An example in which Pascal program text is rearranged to form an ADT.
      This example demonstrates the use of additive macros.

@!******************************

@O@<ex05.out@>==@{@-
program adt(input,output);
@<Types@>
@<Variables@>
@<Procedures@>
begin startproc; end.
@}

@!******************************

@$@<Types@>+=@{@-
type buffer_type =
   record
   length : integer;
   buf : array[1..100] of char;
   end;
@}

@$@<Variables@>+=@{@-
bigbuf : buffer_type;
@}

@$@<Procedures@>+=@{@-
procedure buf_init (var b : buffer_type               ) {Body of buf_init}
procedure buf_add  (var b : buffer_type;     ch : char) {Body of buf_add}
procedure buf_get  (var b : buffer_type; var ch : char) {Body of buf_get}
@}

@!******************************

@$@<Types@>+=@{@-
type complex_type = record r,i : real; end;
@}

@$@<Procedures@>+=@{@-
procedure cm_set (var c: complex_type; a,b: real)         {Body of cm_set}
procedure cm_add (a,b: complex_type; var c: complex_type) {Body of cm_add}
{Other procedures and functions}
@}

@!******************************

{...more pieces of program...}

@!******************************