/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 */

/*

 * @test

 * @bug 1234567

 * @summary Test that precision() is computed properly.

 * @author Joseph D. Darcy

 */

import java.math.*;

import static java.math.BigDecimal.*;

public class PrecisionTests {

    private static BigDecimal NINE = valueOf(9);

    public static void main(String argv[]) {

        int failures = 0;

        // Smallest and largest values of a given length

        BigDecimal[] testValues = {

            valueOf(1), valueOf(9),

        };

        failures += testPrecision(new BigDecimal(0), 1);

        for(int i = 1; i < 100; i++) {

            for(BigDecimal bd : testValues) {

                failures += testPrecision(bd, i);

                failures += testPrecision(bd.negate(), i);

            }

            testValues[0] = testValues[0].multiply(TEN);

            testValues[1] = testValues[1].multiply(TEN).add(NINE);

        }

        // The following test tries to cover testings for precision of long values

        BigDecimal[] randomTestValues = {

            valueOf(2147483648L),          // 2^31:       10 digits

            valueOf(-2147483648L),         // -2^31:      10 digits

            valueOf(98893745455L),         // random:     11 digits

            valueOf(3455436789887L),       // random:     13 digits

            valueOf(140737488355328L),     // 2^47:       15 digits

            valueOf(-140737488355328L),    // -2^47:      15 digits

            valueOf(7564232235739573L),    // random:     16 digits

            valueOf(25335434990002322L),   // random:     17 digits

            valueOf(9223372036854775807L), // 2^63 - 1:   19 digits

            valueOf(-9223372036854775807L) // -2^63 + 1:  19 digits

        };

        // The array below contains the expected precision of the above numbers

        int[] expectedPrecision = {10, 10, 11, 13, 15, 15, 16, 17, 19, 19};

        for (int i = 0; i < randomTestValues.length; i++) {

            failures += testPrecision(randomTestValues[i], expectedPrecision[i]);

        }

        if (failures > 0) {

            throw new RuntimeException("Incurred " + failures +

                                       " failures while testing precision.");

        }

    }

    private static int testPrecision(BigDecimal bd, int expected) {

        int precision = bd.precision();

        // System.out.printf("Testing %s, expected %d%n", bd, expected);

        if (precision != expected) {

            System.err.printf("For (%s).precision expected %d, got %d%n",

                               bd, expected, precision);

            return 1;

        }

        return 0;

    }

}