fork download
copy 
  1. word(0, '') :- !.
  2. word(1, 'one') :- !.
  3. word(2, 'two') :- !.
  4. word(3, 'three') :- !.
  5. word(4, 'four') :- !.
  6. word(5, 'five') :- !.
  7. word(6, 'six') :- !.
  8. word(7, 'seven') :- !.
  9. word(8, 'eight') :- !.
  10. word(9, 'nine') :- !.
  11. word(10, 'ten') :- !.
  12. word(11, 'eleven') :- !.
  13. word(12, 'twelve') :- !.
  14.  
  15. prefix(N, 'twen') :- 2 is N div 10, !.
  16. prefix(N, 'thir') :- (N is 13 ; 3 is N div 10), !.
  17. prefix(N, 'fif') :- (N is 15 ; 5 is N div 10), !.
  18. prefix(N, W) :- N < 20, !, M is N mod 10, word(M, W).
  19. prefix(N, W) :- !, M is N div 10, word(M, W).
  20.  
  21. postfix(18, 'een') :- !.
  22. postfix(N, 'teen') :- N > 12, N < 20, !.
  23. postfix(N, 'y') :- 8 is N div 10, !.
  24. postfix(_, 'ty') :- !.
  25.  
  26. hour(0, W) :- !, word(12, W).
  27. hour(H, W) :- !, word(H, W).
  28.  
  29. minute(0, '') :- !.
  30. minute(M, W) :- M < 10, !,
  31.     word(M, Mw), swritef(W, 'oh %w', [Mw]).
  32. minute(M, W) :- M < 13, !, word(M, W).
  33. minute(M, W) :- M < 20, !,
  34.     prefix(M, Pre), postfix(M, Post),
  35.     swritef(W, '%w%w', [Pre, Post]). 
  36. minute(M, W) :- M < 60, !,
  37.     prefix(M, Pre), postfix(M, Post),
  38.     SndN is M mod 10,
  39.     %word(SndN, Snd), swritef(W, '%w%w %w', [Pre, Post, Snd]).
  40.     ( SndN is 0, !, swritef(W, '%w%w', [Pre, Post]) ;
  41.         !, word(SndN, Snd), swritef(W, '%w%w %w', [Pre, Post, Snd]) ).
  42.  
  43. mer(H, S) :- H < 12, !, S = 'am'.
  44. mer(_, S) :- S = 'pm'.
  45.  
  46. % time format: HH:MM
  47. tell_time(T) :-
  48.     split_string(T, ':', '', [Hstr, Mstr]),
  49.     number_string(H, Hstr), H >= 0, H < 24, number_string(M, Mstr),
  50.     mer(H, Mer), H_ is H mod 12,
  51.     tell_time(H_, M, Mer), write('\n').
  52.  
  53. tell_time(H, 30, Mer) :- !,
  54.     hour(H, Hw), writef('It is half past %w %w.', [Hw, Mer]).
  55.  
  56. tell_time(H, 15, Mer) :- !,
  57.     hour(H, Hw), writef('It is quarter past %w %w.', [Hw, Mer]).
  58.  
  59. tell_time(H, 45, Mer) :- !,
  60.     NextH is H + 1, hour(NextH, Hw),
  61.     writef('It is quarter before %w %w.', [Hw, Mer]).
  62.  
  63. tell_time(H, 0, Mer) :- !,
  64.     hour(H, Hw), writef('It is %w %w', [Hw, Mer]).
  65.  
  66. tell_time(H, M, Mer) :- !,
  67.     hour(H, Hw), minute(M, Mw),
  68.     writef('It is %w %w %w.', [Hw, Mw, Mer]).
  69.  
  70. program :-
  71.     maplist(tell_time, ['00:00', '01:30', '12:05', '14:01', '20:29', '21:00', '13:45', '17:15']).
Success #stdin #stdout #stderr 0.02s 30888KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
It is twelve am
It is half past one am.
It is twelve oh five pm.
It is two oh one pm.
It is eight twenty nine pm.
It is nine pm
It is quarter before two pm.
It is quarter past five pm.
stderr
copy 
% halt
https://ideone.com/Jf5m0K
language:
Prolog (swi 7.6.4)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!