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/********************* */
/*! \file SimpleVCCompat.java
** \verbatim
** Original author: Morgan Deters <mdeters@cs.nyu.edu>
** Major contributors: none
** Minor contributors (to current version): none
** This file is part of the CVC4 project.
** Copyright (c) 2009-2013 New York University and The University of Iowa
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief A simple demonstration of the Java compatibility interface
** (quite similar to the old CVC3 Java interface)
**
** A simple demonstration of the Java compatibility interface
** (quite similar to the old CVC3 Java interface).
**
** To run the resulting class file, you need to do something like the
** following:
**
** java \
** -classpath path/to/CVC4compat.jar \
** -Djava.library.path=/dir/containing/libcvc4bindings_java_compat.so \
** SimpleVCCompat
**
** For example, if you are building CVC4 without specifying your own
** build directory, the build process puts everything in builds/, and
** you can run this example (after building it with "make") like this:
**
** java \
** -classpath builds/examples:builds/src/bindings/compat/java/CVC4compat.jar \
** -Djava.library.path=builds/src/bindings/compat/java/.libs \
** SimpleVCCompat
**/
import cvc3.*;
public class SimpleVCCompat {
public static void main(String[] args) {
ValidityChecker vc = ValidityChecker.create();
// Prove that for integers x and y:
// x > 0 AND y > 0 => 2x + y >= 3
Type integer = vc.intType();
Expr x = vc.varExpr("x", integer);
Expr y = vc.varExpr("y", integer);
Expr zero = vc.ratExpr(0);
Expr x_positive = vc.gtExpr(x, zero);
Expr y_positive = vc.gtExpr(y, zero);
Expr two = vc.ratExpr(2);
Expr twox = vc.multExpr(two, x);
Expr twox_plus_y = vc.plusExpr(twox, y);
Expr three = vc.ratExpr(3);
Expr twox_plus_y_geq_3 = vc.geExpr(twox_plus_y, three);
Expr formula = vc.impliesExpr(vc.andExpr(x_positive, y_positive),
twox_plus_y_geq_3);
System.out.println("Checking validity of formula " + formula + " with CVC4.");
System.out.println("CVC4 should report VALID.");
System.out.println("Result from CVC4 is: " + vc.query(formula));
}
}
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