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/********************* */
/*! \file simple_vc_cxx.cpp
** \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 C++ interface
**
** A simple demonstration of the C++ interface. Compare to the Java
** interface in SimpleVC.java; they are virtually line-by-line
** identical.
**/
#include <iostream>
//#include <cvc4.h>
#include "smt/smt_engine.h"
using namespace std;
using namespace CVC4;
int main() {
ExprManager em;
SmtEngine smt(&em);
// Prove that for integers x and y:
// x > 0 AND y > 0 => 2x + y >= 3
Type integer = em.integerType();
Expr x = em.mkVar("x", integer);
Expr y = em.mkVar("y", integer);
Expr zero = em.mkConst(Integer(0));
Expr x_positive = em.mkExpr(kind::GT, x, zero);
Expr y_positive = em.mkExpr(kind::GT, y, zero);
Expr two = em.mkConst(Integer(2));
Expr twox = em.mkExpr(kind::MULT, two, x);
Expr twox_plus_y = em.mkExpr(kind::PLUS, twox, y);
Expr three = em.mkConst(Integer(3));
Expr twox_plus_y_geq_3 = em.mkExpr(kind::GEQ, twox_plus_y, three);
BoolExpr formula =
BoolExpr(em.mkExpr(kind::AND, x_positive, y_positive)).
impExpr(BoolExpr(twox_plus_y_geq_3));
cout << "Checking validity of formula " << formula << " with CVC4." << endl;
cout << "CVC4 should report VALID." << endl;
cout << "Result from CVC4 is: " << smt.query(formula) << endl;
return 0;
}
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