| /* |
| * Copyright (c) 2012, 2016, 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.BigInteger; |
| |
| /** |
| * @test Test for Math.*Exact integer and long methods. |
| * @bug 6708398 |
| * @summary Basic tests for Math exact arithmetic operations. |
| * |
| * @author Roger Riggs |
| */ |
| public class ExactArithTests { |
| |
| /** |
| * The count of test errors. |
| */ |
| private static int errors = 0; |
| |
| /** |
| * @param args the command line arguments |
| */ |
| public static void main(String[] args) { |
| testIntegerExact(); |
| testLongExact(); |
| testLongIntExact(); |
| |
| if (errors > 0) { |
| throw new RuntimeException(errors + " errors found in ExactArithTests."); |
| } |
| } |
| |
| static void fail(String message) { |
| errors++; |
| System.err.println(message); |
| } |
| |
| /** |
| * Test Math.addExact, multiplyExact, subtractExact, toIntValue methods |
| * with {@code int} arguments. |
| */ |
| static void testIntegerExact() { |
| testIntegerExact(0, 0); |
| testIntegerExact(1, 1); |
| testIntegerExact(1, -1); |
| testIntegerExact(-1, 1); |
| testIntegerExact(1000, 2000); |
| |
| testIntegerExact(Integer.MIN_VALUE, Integer.MIN_VALUE); |
| testIntegerExact(Integer.MAX_VALUE, Integer.MAX_VALUE); |
| testIntegerExact(Integer.MIN_VALUE, 1); |
| testIntegerExact(Integer.MAX_VALUE, 1); |
| testIntegerExact(Integer.MIN_VALUE, 2); |
| testIntegerExact(Integer.MAX_VALUE, 2); |
| testIntegerExact(Integer.MIN_VALUE, -1); |
| testIntegerExact(Integer.MAX_VALUE, -1); |
| testIntegerExact(Integer.MIN_VALUE, -2); |
| testIntegerExact(Integer.MAX_VALUE, -2); |
| |
| } |
| |
| /** |
| * Test exact arithmetic by comparing with the same operations using long |
| * and checking that the result is the same as the integer truncation. |
| * Errors are reported with {@link fail}. |
| * |
| * @param x first parameter |
| * @param y second parameter |
| */ |
| static void testIntegerExact(int x, int y) { |
| try { |
| // Test addExact |
| int sum = Math.addExact(x, y); |
| long sum2 = (long) x + (long) y; |
| if ((int) sum2 != sum2) { |
| fail("FAIL: int Math.addExact(" + x + " + " + y + ") = " + sum + "; expected Arithmetic exception"); |
| } else if (sum != sum2) { |
| fail("FAIL: long Math.addExact(" + x + " + " + y + ") = " + sum + "; expected: " + sum2); |
| } |
| } catch (ArithmeticException ex) { |
| long sum2 = (long) x + (long) y; |
| if ((int) sum2 == sum2) { |
| fail("FAIL: int Math.addExact(" + x + " + " + y + ")" + "; Unexpected exception: " + ex); |
| |
| } |
| } |
| |
| try { |
| // Test subtractExact |
| int diff = Math.subtractExact(x, y); |
| long diff2 = (long) x - (long) y; |
| if ((int) diff2 != diff2) { |
| fail("FAIL: int Math.subtractExact(" + x + " - " + y + ") = " + diff + "; expected: " + diff2); |
| } |
| |
| } catch (ArithmeticException ex) { |
| long diff2 = (long) x - (long) y; |
| if ((int) diff2 == diff2) { |
| fail("FAIL: int Math.subtractExact(" + x + " - " + y + ")" + "; Unexpected exception: " + ex); |
| } |
| } |
| |
| try { |
| // Test multiplyExact |
| int product = Math.multiplyExact(x, y); |
| long m2 = (long) x * (long) y; |
| if ((int) m2 != m2) { |
| fail("FAIL: int Math.multiplyExact(" + x + " * " + y + ") = " + product + "; expected: " + m2); |
| } |
| } catch (ArithmeticException ex) { |
| long m2 = (long) x * (long) y; |
| if ((int) m2 == m2) { |
| fail("FAIL: int Math.multiplyExact(" + x + " * " + y + ")" + "; Unexpected exception: " + ex); |
| } |
| } |
| |
| try { |
| // Test incrementExact |
| int inc = Math.incrementExact(x); |
| long inc2 = (long) x + 1L; |
| if ((int) inc2 != inc2) { |
| fail("FAIL: int Math.incrementExact(" + x + ") = " + inc + "; expected Arithmetic exception"); |
| } else if (inc != inc2) { |
| fail("FAIL: long Math.incrementExact(" + x + ") = " + inc + "; expected: " + inc2); |
| } |
| } catch (ArithmeticException ex) { |
| long inc2 = (long) x + 1L; |
| if ((int) inc2 == inc2) { |
| fail("FAIL: int Math.incrementExact(" + x + ")" + "; Unexpected exception: " + ex); |
| |
| } |
| } |
| |
| try { |
| // Test decrementExact |
| int dec = Math.decrementExact(x); |
| long dec2 = (long) x - 1L; |
| if ((int) dec2 != dec2) { |
| fail("FAIL: int Math.decrementExact(" + x + ") = " + dec + "; expected Arithmetic exception"); |
| } else if (dec != dec2) { |
| fail("FAIL: long Math.decrementExact(" + x + ") = " + dec + "; expected: " + dec2); |
| } |
| } catch (ArithmeticException ex) { |
| long dec2 = (long) x - 1L; |
| if ((int) dec2 == dec2) { |
| fail("FAIL: int Math.decrementExact(" + x + ")" + "; Unexpected exception: " + ex); |
| |
| } |
| } |
| |
| try { |
| // Test negateExact |
| int neg = Math.negateExact(x); |
| long neg2 = -((long)x) ; |
| if ((int) neg2 != neg2) { |
| fail("FAIL: int Math.negateExact(" + x + ") = " + neg + "; expected Arithmetic exception"); |
| } else if (neg != neg2) { |
| fail("FAIL: long Math.negateExact(" + x + ") = " + neg + "; expected: " + neg2); |
| } |
| } catch (ArithmeticException ex) { |
| long neg2 = (long) x - 1L; |
| if ((int) neg2 == neg2) { |
| fail("FAIL: int Math.negateExact(" + x + ")" + "; Unexpected exception: " + ex); |
| |
| } |
| } |
| } |
| |
| /** |
| * Test Math.addExact, multiplyExact, subtractExact, toIntExact methods |
| * with {@code long} arguments. |
| */ |
| static void testLongExact() { |
| testLongExactTwice(0, 0); |
| testLongExactTwice(1, 1); |
| testLongExactTwice(1, -1); |
| testLongExactTwice(1000, 2000); |
| |
| testLongExactTwice(Long.MIN_VALUE, Long.MIN_VALUE); |
| testLongExactTwice(Long.MAX_VALUE, Long.MAX_VALUE); |
| testLongExactTwice(Long.MIN_VALUE, 1); |
| testLongExactTwice(Long.MAX_VALUE, 1); |
| testLongExactTwice(Long.MIN_VALUE, 2); |
| testLongExactTwice(Long.MAX_VALUE, 2); |
| testLongExactTwice(Long.MIN_VALUE, -1); |
| testLongExactTwice(Long.MAX_VALUE, -1); |
| testLongExactTwice(Long.MIN_VALUE, -2); |
| testLongExactTwice(Long.MAX_VALUE, -2); |
| testLongExactTwice(Long.MIN_VALUE/2, 2); |
| testLongExactTwice(Long.MAX_VALUE, 2); |
| testLongExactTwice(Integer.MAX_VALUE, Integer.MAX_VALUE); |
| testLongExactTwice(Integer.MAX_VALUE, -Integer.MAX_VALUE); |
| testLongExactTwice(Integer.MAX_VALUE+1, Integer.MAX_VALUE+1); |
| testLongExactTwice(Integer.MAX_VALUE+1, -Integer.MAX_VALUE+1); |
| testLongExactTwice(Integer.MIN_VALUE-1, Integer.MIN_VALUE-1); |
| testLongExactTwice(Integer.MIN_VALUE-1, -Integer.MIN_VALUE-1); |
| testLongExactTwice(Integer.MIN_VALUE/2, 2); |
| |
| } |
| |
| /** |
| * Test each of the exact operations with the arguments and |
| * with the arguments reversed. |
| * @param x |
| * @param y |
| */ |
| static void testLongExactTwice(long x, long y) { |
| testLongExact(x, y); |
| testLongExact(y, x); |
| } |
| |
| |
| /** |
| * Test long exact arithmetic by comparing with the same operations using BigInteger |
| * and checking that the result is the same as the long truncation. |
| * Errors are reported with {@link fail}. |
| * |
| * @param x first parameter |
| * @param y second parameter |
| */ |
| static void testLongExact(long x, long y) { |
| BigInteger resultBig = null; |
| final BigInteger xBig = BigInteger.valueOf(x); |
| final BigInteger yBig = BigInteger.valueOf(y); |
| try { |
| // Test addExact |
| resultBig = xBig.add(yBig); |
| long sum = Math.addExact(x, y); |
| checkResult("long Math.addExact", x, y, sum, resultBig); |
| } catch (ArithmeticException ex) { |
| if (inLongRange(resultBig)) { |
| fail("FAIL: long Math.addExact(" + x + " + " + y + "); Unexpected exception: " + ex); |
| } |
| } |
| |
| try { |
| // Test subtractExact |
| resultBig = xBig.subtract(yBig); |
| long diff = Math.subtractExact(x, y); |
| checkResult("long Math.subtractExact", x, y, diff, resultBig); |
| } catch (ArithmeticException ex) { |
| if (inLongRange(resultBig)) { |
| fail("FAIL: long Math.subtractExact(" + x + " - " + y + ")" + "; Unexpected exception: " + ex); |
| } |
| } |
| |
| try { |
| // Test multiplyExact |
| resultBig = xBig.multiply(yBig); |
| long product = Math.multiplyExact(x, y); |
| checkResult("long Math.multiplyExact", x, y, product, resultBig); |
| } catch (ArithmeticException ex) { |
| if (inLongRange(resultBig)) { |
| fail("FAIL: long Math.multiplyExact(" + x + " * " + y + ")" + "; Unexpected exception: " + ex); |
| } |
| } |
| |
| try { |
| // Test incrementExact |
| resultBig = xBig.add(BigInteger.ONE); |
| long inc = Math.incrementExact(x); |
| checkResult("long Math.incrementExact", x, 1L, inc, resultBig); |
| } catch (ArithmeticException ex) { |
| if (inLongRange(resultBig)) { |
| fail("FAIL: long Math.incrementExact(" + x + "); Unexpected exception: " + ex); |
| } |
| } |
| |
| try { |
| // Test decrementExact |
| resultBig = xBig.subtract(BigInteger.ONE); |
| long dec = Math.decrementExact(x); |
| checkResult("long Math.decrementExact", x, 1L, dec, resultBig); |
| } catch (ArithmeticException ex) { |
| if (inLongRange(resultBig)) { |
| fail("FAIL: long Math.decrementExact(" + x + "); Unexpected exception: " + ex); |
| } |
| } |
| |
| try { |
| // Test negateExact |
| resultBig = xBig.negate(); |
| long dec = Math.negateExact(x); |
| checkResult("long Math.negateExact", x, 0L, dec, resultBig); |
| } catch (ArithmeticException ex) { |
| if (inLongRange(resultBig)) { |
| fail("FAIL: long Math.negateExact(" + x + "); Unexpected exception: " + ex); |
| } |
| } |
| |
| try { |
| // Test toIntExact |
| int value = Math.toIntExact(x); |
| if ((long)value != x) { |
| fail("FAIL: " + "long Math.toIntExact" + "(" + x + ") = " + value + "; expected an arithmetic exception: "); |
| } |
| } catch (ArithmeticException ex) { |
| if (resultBig.bitLength() <= 32) { |
| fail("FAIL: long Math.toIntExact(" + x + ")" + "; Unexpected exception: " + ex); |
| } |
| } |
| |
| } |
| |
| /** |
| * Compare the expected and actual results. |
| * @param message message for the error |
| * @param x first argument |
| * @param y second argument |
| * @param result actual result value |
| * @param expected expected result value |
| */ |
| static void checkResult(String message, long x, long y, long result, BigInteger expected) { |
| BigInteger resultBig = BigInteger.valueOf(result); |
| if (!inLongRange(expected)) { |
| fail("FAIL: " + message + "(" + x + ", " + y + ") = " + result + "; expected an arithmetic exception: "); |
| } else if (!resultBig.equals(expected)) { |
| fail("FAIL: " + message + "(" + x + ", " + y + ") = " + result + "; expected " + expected); |
| } |
| } |
| |
| /** |
| * Check if the value fits in 64 bits (a long). |
| * @param value |
| * @return true if the value fits in 64 bits (including the sign). |
| */ |
| static boolean inLongRange(BigInteger value) { |
| return value.bitLength() <= 63; |
| } |
| |
| /** |
| * Test Math.multiplyExact method with {@code long} and {@code int} |
| * arguments. |
| */ |
| static void testLongIntExact() { |
| testLongIntExact(0, 0); |
| testLongIntExact(1, 1); |
| testLongIntExact(1, -1); |
| testLongIntExact(1000, 2000); |
| |
| testLongIntExact(Long.MIN_VALUE, Integer.MIN_VALUE); |
| testLongIntExact(Long.MAX_VALUE, Integer.MAX_VALUE); |
| testLongIntExact(Long.MIN_VALUE, 1); |
| testLongIntExact(Long.MAX_VALUE, 1); |
| testLongIntExact(Long.MIN_VALUE, 2); |
| testLongIntExact(Long.MAX_VALUE, 2); |
| testLongIntExact(Long.MIN_VALUE, -1); |
| testLongIntExact(Long.MAX_VALUE, -1); |
| testLongIntExact(Long.MIN_VALUE, -2); |
| testLongIntExact(Long.MAX_VALUE, -2); |
| testLongIntExact(Long.MIN_VALUE/2, 2); |
| testLongIntExact(Long.MAX_VALUE, 2); |
| testLongIntExact(Integer.MAX_VALUE, Integer.MAX_VALUE); |
| testLongIntExact(Integer.MAX_VALUE, -Integer.MAX_VALUE); |
| testLongIntExact((long)Integer.MAX_VALUE+1L, Integer.MAX_VALUE); |
| testLongIntExact((long)Integer.MAX_VALUE+1L, -Integer.MAX_VALUE+1); |
| testLongIntExact((long)Integer.MIN_VALUE-1L, Integer.MIN_VALUE); |
| testLongIntExact((long)Integer.MIN_VALUE-1, Integer.MAX_VALUE); |
| testLongIntExact(Integer.MIN_VALUE/2, 2); |
| } |
| |
| /** |
| * Test long-int exact arithmetic by comparing with the same operations using BigInteger |
| * and checking that the result is the same as the long truncation. |
| * Errors are reported with {@link fail}. |
| * |
| * @param x first parameter |
| * @param y second parameter |
| */ |
| static void testLongIntExact(long x, int y) { |
| BigInteger resultBig = null; |
| final BigInteger xBig = BigInteger.valueOf(x); |
| final BigInteger yBig = BigInteger.valueOf(y); |
| |
| try { |
| // Test multiplyExact |
| resultBig = xBig.multiply(yBig); |
| long product = Math.multiplyExact(x, y); |
| checkResult("long Math.multiplyExact", x, y, product, resultBig); |
| } catch (ArithmeticException ex) { |
| if (inLongRange(resultBig)) { |
| fail("FAIL: long Math.multiplyExact(" + x + " * " + y + ")" + "; Unexpected exception: " + ex); |
| } |
| } |
| } |
| } |