Examples with BigInteger java.math.BigInteger used on opensource projects

Example 61 with BigInteger

use of java.math.BigInteger in project guava by google.

the class LongMathTest method testFloorPowerOfTwo.

public void testFloorPowerOfTwo() {
    for (long x : POSITIVE_LONG_CANDIDATES) {
        BigInteger expectedResult = BigIntegerMath.floorPowerOfTwo(BigInteger.valueOf(x));
        assertEquals(expectedResult.longValue(), LongMath.floorPowerOfTwo(x));
    }
}

Example 62 with BigInteger

use of java.math.BigInteger in project guava by google.

the class LongMathTest method testLessThanBranchFree.

// slow
@AndroidIncompatible
public void testLessThanBranchFree() {
    for (long x : ALL_LONG_CANDIDATES) {
        for (long y : ALL_LONG_CANDIDATES) {
            BigInteger difference = BigInteger.valueOf(x).subtract(BigInteger.valueOf(y));
            if (fitsInLong(difference)) {
                int expected = (x < y) ? 1 : 0;
                int actual = LongMath.lessThanBranchFree(x, y);
                assertEquals(expected, actual);
            }
        }
    }
}

Example 63 with BigInteger

use of java.math.BigInteger in project guava by google.

the class LongMathTest method testCheckedSubtract.

// TODO
@GwtIncompatible
// slow
@AndroidIncompatible
public void testCheckedSubtract() {
    for (long a : ALL_LONG_CANDIDATES) {
        for (long b : ALL_LONG_CANDIDATES) {
            BigInteger expectedResult = valueOf(a).subtract(valueOf(b));
            boolean expectedSuccess = fitsInLong(expectedResult);
            try {
                assertEquals(a - b, LongMath.checkedSubtract(a, b));
                assertTrue(expectedSuccess);
            } catch (ArithmeticException e) {
                if (expectedSuccess) {
                    failFormat("expected checkedSubtract(%s, %s) = %s; got ArithmeticException", a, b, expectedResult);
                }
            }
        }
    }
}

Example 64 with BigInteger

use of java.math.BigInteger in project guava by google.

the class LongMathTest method testCheckedMultiply.

// TODO
@GwtIncompatible
// slow
@AndroidIncompatible
public void testCheckedMultiply() {
    boolean isAndroid = System.getProperties().getProperty("java.runtime.name").contains("Android");
    for (long a : ALL_LONG_CANDIDATES) {
        for (long b : ALL_LONG_CANDIDATES) {
            if (isAndroid && a == -4294967296L && b == 2147483648L) {
                /*
           * Bug in older versions of Android we test against, since fixed: -9223372036854775808L /
           * -4294967296L = -9223372036854775808L!
           *
           * To be clear, this bug affects not the test's computation of the expected result but the
           * _actual prod code_. But it probably affects only unusual cases.
           */
                continue;
            }
            BigInteger expectedResult = valueOf(a).multiply(valueOf(b));
            boolean expectedSuccess = fitsInLong(expectedResult);
            try {
                assertEquals(a * b, LongMath.checkedMultiply(a, b));
                assertTrue(expectedSuccess);
            } catch (ArithmeticException e) {
                if (expectedSuccess) {
                    failFormat("expected checkedMultiply(%s, %s) = %s; got ArithmeticException", a, b, expectedResult);
                }
            }
        }
    }
}

Example 65 with BigInteger

use of java.math.BigInteger in project guava by google.

the class LongMathTest method testConstantsHalfPowersOf10.

// TODO
@GwtIncompatible
public void testConstantsHalfPowersOf10() {
    for (int i = 0; i < LongMath.halfPowersOf10.length; i++) {
        assertEquals(BigIntegerMath.sqrt(BigInteger.TEN.pow(2 * i + 1), FLOOR), BigInteger.valueOf(LongMath.halfPowersOf10[i]));
    }
    BigInteger nextBigger = BigIntegerMath.sqrt(BigInteger.TEN.pow(2 * LongMath.halfPowersOf10.length + 1), FLOOR);
    assertTrue(nextBigger.compareTo(BigInteger.valueOf(Long.MAX_VALUE)) > 0);
}