Example usage for java.math BigDecimal BigDecimal

Introduction

In this page you can find the example usage for java.math BigDecimal BigDecimal.

Prototype

public BigDecimal(long val, MathContext mc) 

Source Link

Document

Translates a long into a BigDecimal , with rounding according to the context settings.

Usage

From source file:Main.java

public static BigDecimal cuberoot(BigDecimal b) {
    // Specify a math context with 40 digits of precision.

    MathContext mc = new MathContext(40);

    BigDecimal x = new BigDecimal("1", mc);

    // Search for the cube root via the Newton-Raphson loop. Output each //
    // successive iteration's value.

    for (int i = 0; i < ITER; i++) {
        x = x.subtract(//from  w  w  w. j  a  va 2  s .  c o m
                x.pow(3, mc).subtract(b, mc).divide(new BigDecimal("3", mc).multiply(x.pow(2, mc), mc), mc),
                mc);
    }
    return x;
}

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From source file:Main.java

/**
 * Compute the square root of x to a given scale, x >= 0. Use Newton's
 * algorithm.//from   w  w  w .  j  a  v  a2  s. c  o  m
 * 
 * @param x
 *            the value of x
 * @return the result value
 */
public static BigDecimal sqrt(BigDecimal x) {
    // Check that x >= 0.
    if (x.signum() < 0) {
        throw new ArithmeticException("x < 0");
    }

    // n = x*(10^(2*SCALE))
    BigInteger n = x.movePointRight(SCALE << 1).toBigInteger();

    // The first approximation is the upper half of n.
    int bits = (n.bitLength() + 1) >> 1;
    BigInteger ix = n.shiftRight(bits);
    BigInteger ixPrev;

    // Loop until the approximations converge
    // (two successive approximations are equal after rounding).
    do {
        ixPrev = ix;

        // x = (x + n/x)/2
        ix = ix.add(n.divide(ix)).shiftRight(1);

        Thread.yield();
    } while (ix.compareTo(ixPrev) != 0);

    return new BigDecimal(ix, SCALE);
}

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From source file:mondrian.util.UtilCompatibleJdk15.java

/**
 * This generates a BigDecimal with a precision reflecting
 * the precision of the input double.//from   w  w w  .j av  a  2 s . c om
 *
 * @param d input double
 * @return BigDecimal
 */
public BigDecimal makeBigDecimalFromDouble(double d) {
    return new BigDecimal(d, MathContext.DECIMAL64);
}

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From source file:cherry.foundation.type.SecureBigDecimalTest.java

@Test
public void testRandomTest() {
    for (int i = 0; i < 100; i++) {
        BigInteger bi = new BigInteger(RandomUtils.nextBytes(1024));
        int scale = random.nextInt();
        BigDecimal plain = new BigDecimal(bi, scale);
        SecureBigDecimal sec0 = plainValueOf(plain);
        SecureBigDecimal sec1 = cryptoValueOf(sec0.crypto());
        assertThat(sec1.plain(), is(plain));
    }/*from  w ww.ja  v  a2s  .  c  om*/
}

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From source file:com.splicemachine.testutil.RandomDerbyDecimalBuilder.java

public static BigDecimal buildOne(int precision, int scale, boolean negative) {
    checkArgument(precision >= PRECISION_MIN && precision <= PRECISION_MAX);
    checkArgument(scale <= precision);

    BigInteger unscaledVal = new BigInteger((negative ? "-" : "") + RandomStringUtils.randomNumeric(precision));
    return new BigDecimal(unscaledVal, scale);
}

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