Prolog: update denotational_semantics problems

1 files changed, 18 insertions, 0 deletions

diff --git a/prolog/problems/algol/algol_for_3/en.py b/prolog/problems/algol/algol_for_3/en.py
new file mode 100644
index 0000000..2f46d36
--- /dev/null
+++ b/prolog/problems/algol/algol_for_3/en.py
@@ -0,0 +1,18 @@
+name = 'algol_for/3'
+slug = 'interpreter for mini-algol with for-statement'
+
+description = '''\
+<p>Extend the given DCG for mini-algol to support the for-statement. Example:</p>
+<pre>
+% for a := 0 & a < 5 & a := a + 1 do
+% begin
+%   print(a)
+% end
+?- _Program = [begin,for,a,:=,0,&,a,<,5,&,a,:=,a+1,do,begin,print(a),end,end],
+    algol_for(_F, _Program, []),
+    apply([a=2], Output, _F).
+  Output = [a=5,printout=[0,1,2,3,4]].
+</pre>
+'''
+
+hint = {}