org.knowceans.util
Class ExpDouble
java.lang.Object
org.knowceans.util.ExpDouble
public class ExpDouble
- extends java.lang.Object
ExpDouble represents a double-precision number by a mantissa, a decimal
exponent and the number of digits in the mantissa, in order to allow
formatting of the represented double.
- Author:
- gregor
Constructor Summary |
ExpDouble(double x,
int maxdigits)
Creates an ExpDouble from a double, with the specified number of digits. |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
ExpDouble
public ExpDouble(double x,
int maxdigits)
- Creates an ExpDouble from a double, with the specified number of digits.
- Parameters:
x
- maxdigits
-
main
public static void main(java.lang.String[] args)
round
public boolean round(int ndigits)
- Round this instance to the number of significant digits
- Parameters:
digits
-
- Returns:
- whether magnitude and digits had to be changed by rounding values
>9.5 to 10
toString
public java.lang.String toString()
- Overrides:
toString
in class java.lang.Object
- Returns:
- string representation of this object
toExpString
public java.lang.String toExpString()
- Returns:
- a string representation in exponential notation
debug
public java.lang.String debug()
- Returns:
- a debug string with the part of this ExpDouble
toDoubleUnsigned
public double toDoubleUnsigned()
- Returns:
- double representation of this object according to rounding.
toDouble
public double toDouble()
- Returns:
- double representation of this object according to rounding.
orderOfMagnitude
public static int orderOfMagnitude(double x)
- Parameters:
x
-
- Returns:
- order of magnitue of x, i.e., n : x in [ 10^n, 10^(n+1) )