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/********************* */
/*! \file SimpleVC.java
** \verbatim
** Top contributors (to current version):
** Morgan Deters, Aina Niemetz, Andres Noetzli
** This file is part of the CVC4 project.
** Copyright (c) 2009-2020 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief A simple demonstration of the Java interface
**
** A simple demonstration of the Java interface.
**
** To run the resulting class file, you need to do something like the
** following:
**
** java \
** -cp path/to/CVC4.jar:SimpleVC.jar \
** -Djava.library.path=/dir/containing/libcvc4jni.so \
** SimpleVC
**
**/
import edu.stanford.CVC4.*;
public class SimpleVC {
public static void main(String[] args) {
System.loadLibrary("cvc4jni");
ExprManager em = new ExprManager();
SmtEngine smt = new SmtEngine(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(new Rational(0));
Expr x_positive = em.mkExpr(Kind.GT, x, zero);
Expr y_positive = em.mkExpr(Kind.GT, y, zero);
Expr two = em.mkConst(new Rational(2));
Expr twox = em.mkExpr(Kind.MULT, two, x);
Expr twox_plus_y = em.mkExpr(Kind.PLUS, twox, y);
Expr three = em.mkConst(new Rational(3));
Expr twox_plus_y_geq_3 = em.mkExpr(Kind.GEQ, twox_plus_y, three);
Expr formula =
em.mkExpr(Kind.AND, x_positive, y_positive).impExpr(twox_plus_y_geq_3);
System.out.println(
"Checking entailment of formula " + formula + " with CVC4.");
System.out.println("CVC4 should report ENTAILED.");
System.out.println("Result from CVC4 is: " + smt.checkEntailed(formula));
}
}
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