dos_compilers/Digital Research PLI-86 v1/REVERSE.PLI
2024-06-30 12:01:25 -07:00

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/******************************************************/
/* This program reads a sentence and reverses it. */
/******************************************************/
reverse:
procedure options(main);
declare
sentence pointer,
1 wordnode based (sentence),
2 word character(30) varying,
2 next pointer;
do while('1'b);
call read_it();
if sentence = null then
stop;
call write_it();
end;
read_it:
procedure;
declare
newword character(30) varying,
newnode pointer;
sentence = null;
put skip list('What''s up? ');
do while('1'b);
get list(newword);
if newword = '.' then
return;
allocate wordnode set (newnode);
newnode->next = sentence;
sentence = newnode;
word = newword;
end;
end read_it;
write_it:
procedure;
declare
p pointer;
put skip list('Actually, ');
do while (sentence ^= null);
put list(word);
p = sentence;
sentence = next;
free p->wordnode;
end;
put list('.');
put skip;
end write_it;
end reverse;