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+###################### ##
+##! \file SimpleVC.py
+### \verbatim
+### Original author: mdeters
+### Major contributors: none
+### Minor contributors (to current version): none
+### This file is part of the CVC4 prototype.
+### Copyright (c) 2009, 2010, 2011 The Analysis of Computer Systems Group (ACSys)
+### Courant Institute of Mathematical Sciences
+### New York University
+### See the file COPYING in the top-level source directory for licensing
+### information.\endverbatim
+###
+### \brief A simple demonstration of the Python interface
+###
+### A simple demonstration of the Python interface. Compare to the
+### C++ interface in simple_vc_cxx.cpp; they are quite similar.
+###
+### To run, use something like:
+###
+### PYTHONPATH=/dir/containing/CVC4.py:$PYTHONPATH \
+### python \
+### -Djava.library.path=/dir/containing/libcvc4bindings_python.so \
+### SimpleVC
+####
+
+from ctypes import cdll
+cdll.LoadLibrary('libcvc4.so')
+cdll.LoadLibrary('libcvc4parser.so')
+cdll.LoadLibrary('libcvc4bindings_python.so')
+import CVC4
+
+def main():
+ em = ExprManager()
+ smt = SmtEngine(em)
+
+ # Prove that for integers x and y:
+ # x > 0 AND y > 0 => 2x + y >= 3
+
+ integer = em.integerType()
+
+ x = em.mkVar("x", integer)
+ y = em.mkVar("y", integer)
+ zero = em.mkConst(Integer(0))
+
+ x_positive = em.mkExpr(kind.GT, x, zero)
+ y_positive = em.mkExpr(kind.GT, y, zero)
+
+ two = em.mkConst(Integer(2))
+ twox = em.mkExpr(kind.MULT, two, x)
+ twox_plus_y = em.mkExpr(kind.PLUS, twox, y)
+
+ three = em.mkConst(Integer(3))
+ twox_plus_y_geq_3 = em.mkExpr(kind.GEQ, twox_plus_y, three)
+
+ formula = BoolExpr(em.mkExpr(kind.AND, x_positive, y_positive)).impExpr(BoolExpr(twox_plus_y_geq_3))
+
+ print "Checking validity of formula " << formula << " with CVC4." << endl
+ print "CVC4 should report VALID." << endl
+ print "Result from CVC4 is: " << smt.query(formula) << endl
+
+ return 0
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