Converts this {@code BigDecimal} to a {@code BigInteger},
checking for lost information. An exception is thrown if this
{@code BigDecimal} has a nonzero fractional part.
@return this {@code BigDecimal} converted to a {@code BigInteger}.
@throws ArithmeticException if {@code this} has a nonzero
fractional part.
Converts this {@code BigDecimal} to a {@code BigInteger}, checking for lost information. An exception is thrown if this {@code BigDecimal} has a nonzero fractional part.
@return this {@code BigDecimal} converted to a {@code BigInteger}. @throws ArithmeticException if {@code this} has a nonzero fractional part.