diff options
Diffstat (limited to 'prolog/problems/dcg/expr_2/common.py')
-rw-r--r-- | prolog/problems/dcg/expr_2/common.py | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/prolog/problems/dcg/expr_2/common.py b/prolog/problems/dcg/expr_2/common.py new file mode 100644 index 0000000..49059f2 --- /dev/null +++ b/prolog/problems/dcg/expr_2/common.py @@ -0,0 +1,23 @@ +id = 170 +group = 'dcg' +number = 77 +visible = False +facts = None + +solution = '''\ +expr --> term170, addterm170. +addterm170 --> []. +addterm170 --> [+], expr. +term170 --> factor170, multfactor170. +multfactor170 --> []. +multfactor170 --> [*], term170. +factor170 --> num170. +factor170 --> ['('], expr, [')']. + +num170 --> digit170. +num170 --> nzdigit170, num_next170. +num_next170 --> digit170. +num_next170 --> digit170, num_next170. +digit170 --> ([0] ; [1] ; [2] ; [3] ; [4] ; [5] ; [6] ; [7] ; [8] ; [9]). +nzdigit170 --> ([1] ; [2] ; [3] ; [4] ; [5] ; [6] ; [7] ; [8] ; [9]). +''' |