%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%     1. %%%%%%%%%%%%%%
% Read all from an input file until end_of_file

?- real_all_from_file('C:\\Users\\....\\pb.txt',L).
% L will contain all the elements read from the input file

%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%    2. %%%%%%%%%%%%%% 
?-generate_random_list(5,101,L),write_to_a_file('C:\\Users\\...\\out.txt',L).

% write_to_a_file writes each of the elements of a list on a line followed by '.'
% e.g. if L=[1,4,5,7,8], then the file 
out.txt is of the form
 1. 
 4. 
 5. 
 7. 
 8. 

%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%    3. %%%%%%%%%%%%%
?-read_all_from_file('C:\\Users\\....\\pb.txt',L), quick_sort(L,S), 
write_to_a_file('C:\\Users\\...\\sorted.txt',L).