| /* |
| * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
| * 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. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.math.BigDecimal; |
| import java.math.RoundingMode; |
| |
| /** |
| * @test Test Math and StrictMath Floor Div / Modulo operations. |
| * @bug 6282196 |
| * @summary Basic tests for Floor division and modulo methods for both Math |
| * and StrictMath for int and long datatypes. |
| */ |
| public class DivModTests { |
| |
| /** |
| * The count of test errors. |
| */ |
| private static int errors = 0; |
| |
| /** |
| * @param args the command line arguments are unused |
| */ |
| public static void main(String[] args) { |
| errors = 0; |
| testIntFloorDivMod(); |
| testLongFloorDivMod(); |
| |
| if (errors > 0) { |
| throw new RuntimeException(errors + " errors found in DivMod methods."); |
| } |
| } |
| |
| /** |
| * Report a test failure and increment the error count. |
| * @param message the formatting string |
| * @param args the variable number of arguments for the message. |
| */ |
| static void fail(String message, Object... args) { |
| errors++; |
| System.out.printf(message, args); |
| } |
| |
| /** |
| * Test the integer floorDiv and floorMod methods. |
| * Math and StrictMath tested and the same results are expected for both. |
| */ |
| static void testIntFloorDivMod() { |
| testIntFloorDivMod(4, 0, new ArithmeticException(), new ArithmeticException()); // Should throw ArithmeticException |
| testIntFloorDivMod(4, 3, 1, 1); |
| testIntFloorDivMod(3, 3, 1, 0); |
| testIntFloorDivMod(2, 3, 0, 2); |
| testIntFloorDivMod(1, 3, 0, 1); |
| testIntFloorDivMod(0, 3, 0, 0); |
| testIntFloorDivMod(4, -3, -2, -2); |
| testIntFloorDivMod(3, -3, -1, 0); |
| testIntFloorDivMod(2, -3, -1, -1); |
| testIntFloorDivMod(1, -3, -1, -2); |
| testIntFloorDivMod(0, -3, 0, 0); |
| testIntFloorDivMod(-1, 3, -1, 2); |
| testIntFloorDivMod(-2, 3, -1, 1); |
| testIntFloorDivMod(-3, 3, -1, 0); |
| testIntFloorDivMod(-4, 3, -2, 2); |
| testIntFloorDivMod(-1, -3, 0, -1); |
| testIntFloorDivMod(-2, -3, 0, -2); |
| testIntFloorDivMod(-3, -3, 1, 0); |
| testIntFloorDivMod(-4, -3, 1, -1); |
| testIntFloorDivMod(Integer.MAX_VALUE, 1, Integer.MAX_VALUE, 0); |
| testIntFloorDivMod(Integer.MAX_VALUE, -1, -Integer.MAX_VALUE, 0); |
| testIntFloorDivMod(Integer.MAX_VALUE, 3, 715827882, 1); |
| testIntFloorDivMod(Integer.MAX_VALUE - 1, 3, 715827882, 0); |
| testIntFloorDivMod(Integer.MIN_VALUE, 3, -715827883, 1); |
| testIntFloorDivMod(Integer.MIN_VALUE + 1, 3, -715827883, 2); |
| testIntFloorDivMod(Integer.MIN_VALUE + 1, -1, Integer.MAX_VALUE, 0); |
| // Special case of integer overflow |
| testIntFloorDivMod(Integer.MIN_VALUE, -1, Integer.MIN_VALUE, 0); |
| } |
| |
| /** |
| * Test FloorDiv and then FloorMod with int data. |
| */ |
| static void testIntFloorDivMod(int x, int y, Object divExpected, Object modExpected) { |
| testIntFloorDiv(x, y, divExpected); |
| testIntFloorMod(x, y, modExpected); |
| } |
| |
| /** |
| * Test FloorDiv with int data. |
| */ |
| static void testIntFloorDiv(int x, int y, Object expected) { |
| Object result = doFloorDiv(x, y); |
| if (!resultEquals(result, expected)) { |
| fail("FAIL: Math.floorDiv(%d, %d) = %s; expected %s%n", x, y, result, expected); |
| } |
| |
| Object strict_result = doStrictFloorDiv(x, y); |
| if (!resultEquals(strict_result, expected)) { |
| fail("FAIL: StrictMath.floorDiv(%d, %d) = %s; expected %s%n", x, y, strict_result, expected); |
| } |
| } |
| |
| /** |
| * Test FloorMod with int data. |
| */ |
| static void testIntFloorMod(int x, int y, Object expected) { |
| Object result = doFloorMod(x, y); |
| if (!resultEquals(result, expected)) { |
| fail("FAIL: Math.floorMod(%d, %d) = %s; expected %s%n", x, y, result, expected); |
| } |
| |
| Object strict_result = doStrictFloorMod(x, y); |
| if (!resultEquals(strict_result, expected)) { |
| fail("FAIL: StrictMath.floorMod(%d, %d) = %s; expected %s%n", x, y, strict_result, expected); |
| } |
| |
| try { |
| // Verify result against double precision floor function |
| int tmp = x / y; // Force ArithmeticException for divide by zero |
| double ff = x - Math.floor((double)x / (double)y) * y; |
| int fr = (int)ff; |
| boolean t = (fr == ((Integer)result)); |
| if (!result.equals(fr)) { |
| fail("FAIL: Math.floorMod(%d, %d) = %s differs from Math.floor(x, y): %d%n", x, y, result, fr); |
| } |
| } catch (ArithmeticException ae) { |
| if (y != 0) { |
| fail("FAIL: Math.floorMod(%d, %d); unexpected %s%n", x, y, ae); |
| } |
| } |
| } |
| |
| /** |
| * Test the floorDiv and floorMod methods for primitive long. |
| */ |
| static void testLongFloorDivMod() { |
| testLongFloorDivMod(4L, 0L, new ArithmeticException(), new ArithmeticException()); // Should throw ArithmeticException |
| testLongFloorDivMod(4L, 3L, 1L, 1L); |
| testLongFloorDivMod(3L, 3L, 1L, 0L); |
| testLongFloorDivMod(2L, 3L, 0L, 2L); |
| testLongFloorDivMod(1L, 3L, 0L, 1L); |
| testLongFloorDivMod(0L, 3L, 0L, 0L); |
| testLongFloorDivMod(4L, -3L, -2L, -2L); |
| testLongFloorDivMod(3L, -3L, -1L, 0l); |
| testLongFloorDivMod(2L, -3L, -1L, -1L); |
| testLongFloorDivMod(1L, -3L, -1L, -2L); |
| testLongFloorDivMod(0L, -3L, 0L, 0L); |
| testLongFloorDivMod(-1L, 3L, -1L, 2L); |
| testLongFloorDivMod(-2L, 3L, -1L, 1L); |
| testLongFloorDivMod(-3L, 3L, -1L, 0L); |
| testLongFloorDivMod(-4L, 3L, -2L, 2L); |
| testLongFloorDivMod(-1L, -3L, 0L, -1L); |
| testLongFloorDivMod(-2L, -3L, 0L, -2L); |
| testLongFloorDivMod(-3L, -3L, 1L, 0L); |
| testLongFloorDivMod(-4L, -3L, 1L, -1L); |
| |
| testLongFloorDivMod(Long.MAX_VALUE, 1, Long.MAX_VALUE, 0L); |
| testLongFloorDivMod(Long.MAX_VALUE, -1, -Long.MAX_VALUE, 0L); |
| testLongFloorDivMod(Long.MAX_VALUE, 3L, Long.MAX_VALUE / 3L, 1L); |
| testLongFloorDivMod(Long.MAX_VALUE - 1L, 3L, (Long.MAX_VALUE - 1L) / 3L, 0L); |
| testLongFloorDivMod(Long.MIN_VALUE, 3L, Long.MIN_VALUE / 3L - 1L, 1L); |
| testLongFloorDivMod(Long.MIN_VALUE + 1L, 3L, Long.MIN_VALUE / 3L - 1L, 2L); |
| testLongFloorDivMod(Long.MIN_VALUE + 1, -1, Long.MAX_VALUE, 0L); |
| // Special case of integer overflow |
| testLongFloorDivMod(Long.MIN_VALUE, -1, Long.MIN_VALUE, 0L); |
| } |
| |
| /** |
| * Test the integer floorDiv and floorMod methods. |
| * Math and StrictMath are tested and the same results are expected for both. |
| */ |
| static void testLongFloorDivMod(long x, long y, Object divExpected, Object modExpected) { |
| testLongFloorDiv(x, y, divExpected); |
| testLongFloorMod(x, y, modExpected); |
| } |
| |
| /** |
| * Test FloorDiv with long arguments against expected value. |
| * The expected value is usually a Long but in some cases is |
| * an ArithmeticException. |
| * |
| * @param x dividend |
| * @param y modulus |
| * @param expected expected value, |
| */ |
| static void testLongFloorDiv(long x, long y, Object expected) { |
| Object result = doFloorDiv(x, y); |
| if (!resultEquals(result, expected)) { |
| fail("FAIL: long Math.floorDiv(%d, %d) = %s; expected %s%n", x, y, result, expected); |
| } |
| |
| Object strict_result = doStrictFloorDiv(x, y); |
| if (!resultEquals(strict_result, expected)) { |
| fail("FAIL: long StrictMath.floorDiv(%d, %d) = %s; expected %s%n", x, y, strict_result, expected); |
| } |
| } |
| |
| /** |
| * Test FloorMod of long arguments against expected value. |
| * The expected value is usually a Long but in some cases is |
| * an ArithmeticException. |
| * |
| * @param x dividend |
| * @param y modulus |
| * @param expected expected value |
| */ |
| static void testLongFloorMod(long x, long y, Object expected) { |
| Object result = doFloorMod(x, y); |
| if (!resultEquals(result, expected)) { |
| fail("FAIL: long Math.floorMod(%d, %d) = %s; expected %s%n", x, y, result, expected); |
| } |
| |
| Object strict_result = doStrictFloorMod(x, y); |
| if (!resultEquals(strict_result, expected)) { |
| fail("FAIL: long StrictMath.floorMod(%d, %d) = %s; expected %s%n", x, y, strict_result, expected); |
| } |
| |
| try { |
| // Verify the result against BigDecimal rounding mode. |
| BigDecimal xD = new BigDecimal(x); |
| BigDecimal yD = new BigDecimal(y); |
| BigDecimal resultD = xD.divide(yD, RoundingMode.FLOOR); |
| resultD = resultD.multiply(yD); |
| resultD = xD.subtract(resultD); |
| long fr = resultD.longValue(); |
| if (!result.equals(fr)) { |
| fail("FAIL: Long.floorMod(%d, %d) = %d is different than BigDecimal result: %d%n", x, y, result, fr); |
| |
| } |
| } catch (ArithmeticException ae) { |
| if (y != 0) { |
| fail("FAIL: long Math.floorMod(%d, %d); unexpected ArithmeticException from bigdecimal"); |
| } |
| } |
| } |
| |
| /** |
| * Invoke floorDiv and return the result or any exception. |
| * @param x the x value |
| * @param y the y value |
| * @return the result Integer or an exception. |
| */ |
| static Object doFloorDiv(int x, int y) { |
| try { |
| return Math.floorDiv(x, y); |
| } catch (ArithmeticException ae) { |
| return ae; |
| } |
| } |
| |
| /** |
| * Invoke floorDiv and return the result or any exception. |
| * @param x the x value |
| * @param y the y value |
| * @return the result Integer or an exception. |
| */ |
| static Object doFloorDiv(long x, long y) { |
| try { |
| return Math.floorDiv(x, y); |
| } catch (ArithmeticException ae) { |
| return ae; |
| } |
| } |
| |
| /** |
| * Invoke floorDiv and return the result or any exception. |
| * @param x the x value |
| * @param y the y value |
| * @return the result Integer or an exception. |
| */ |
| static Object doFloorMod(int x, int y) { |
| try { |
| return Math.floorMod(x, y); |
| } catch (ArithmeticException ae) { |
| return ae; |
| } |
| } |
| |
| /** |
| * Invoke floorDiv and return the result or any exception. |
| * @param x the x value |
| * @param y the y value |
| * @return the result Integer or an exception. |
| */ |
| static Object doFloorMod(long x, long y) { |
| try { |
| return Math.floorMod(x, y); |
| } catch (ArithmeticException ae) { |
| return ae; |
| } |
| } |
| |
| /** |
| * Invoke floorDiv and return the result or any exception. |
| * @param x the x value |
| * @param y the y value |
| * @return the result Integer or an exception. |
| */ |
| static Object doStrictFloorDiv(int x, int y) { |
| try { |
| return StrictMath.floorDiv(x, y); |
| } catch (ArithmeticException ae) { |
| return ae; |
| } |
| } |
| |
| /** |
| * Invoke floorDiv and return the result or any exception. |
| * @param x the x value |
| * @param y the y value |
| * @return the result Integer or an exception. |
| */ |
| static Object doStrictFloorDiv(long x, long y) { |
| try { |
| return StrictMath.floorDiv(x, y); |
| } catch (ArithmeticException ae) { |
| return ae; |
| } |
| } |
| |
| /** |
| * Invoke floorDiv and return the result or any exception. |
| * @param x the x value |
| * @param y the y value |
| * @return the result Integer or an exception. |
| */ |
| static Object doStrictFloorMod(int x, int y) { |
| try { |
| return StrictMath.floorMod(x, y); |
| } catch (ArithmeticException ae) { |
| return ae; |
| } |
| } |
| |
| /** |
| * Invoke floorDiv and return the result or any exception. |
| * @param x the x value |
| * @param y the y value |
| * @return the result Integer or an exception. |
| */ |
| static Object doStrictFloorMod(long x, long y) { |
| try { |
| return StrictMath.floorMod(x, y); |
| } catch (ArithmeticException ae) { |
| return ae; |
| } |
| } |
| |
| /** |
| * Returns a boolean by comparing the result and the expected value. |
| * The equals method is not defined for ArithmeticException but it is |
| * desirable to have equals return true if the expected and the result |
| * both threw the same exception (class and message.) |
| * |
| * @param result the result from testing the method |
| * @param expected the expected value |
| * @return true if the result is equal to the expected values; false otherwise. |
| */ |
| static boolean resultEquals(Object result, Object expected) { |
| if (result.getClass() != expected.getClass()) { |
| fail("FAIL: Result type mismatch, %s; expected: %s%n", |
| result.getClass().getName(), expected.getClass().getName()); |
| return false; |
| } |
| |
| if (result.equals(expected)) { |
| return true; |
| } |
| // Handle special case to compare ArithmeticExceptions |
| if (result instanceof ArithmeticException && expected instanceof ArithmeticException) { |
| return true; |
| } |
| return false; |
| } |
| |
| } |
