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+######################                                                        ##
+##! \file SimpleVC.rb
+### \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 Ruby interface
+###
+### A simple demonstration of the Ruby interface.  Compare to the
+### C++ interface in simple_vc_cxx.cpp; they are quite similar.
+###
+### To run, use something like:
+###
+###   ln -s ../builds/src/bindings/.libs/libcvc4bindings_ruby.so.0.0.0 CVC4.so
+###   ruby SimpleVC.rb
+####
+
+require 'CVC4'
+include CVC4 # CVC4::Integer still has to be qualified
+
+em = ExprManager.new
+smt = SmtEngine.new(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(CVC4::Integer.new(0))
+
+x_positive = em.mkExpr(GT, x, zero)
+y_positive = em.mkExpr(GT, y, zero)
+
+two = em.mkConst(CVC4::Integer.new(2))
+twox = em.mkExpr(MULT, two, x)
+twox_plus_y = em.mkExpr(PLUS, twox, y)
+
+three = em.mkConst(CVC4::Integer.new(3))
+twox_plus_y_geq_3 = em.mkExpr(GEQ, twox_plus_y, three)
+
+formula = BoolExpr.new(em.mkExpr(AND, x_positive, y_positive)).impExpr(BoolExpr.new(twox_plus_y_geq_3))
+
+puts "Checking validity of formula " + formula.toString + " with CVC4."
+puts "CVC4 should report VALID."
+puts "Result from CVC4 is: " + smt.query(formula).toString
+
+exit
+