BigIntegerMath log10() function | Guava | Java
The method log10(BigInteger x, RoundingMode mode) of Guava’s BigIntegerMath class returns the base-10 logarithm of x, rounded according to the specified rounding mode.
Syntax:
public static int log10(BigInteger x, RoundingMode mode)
Parameters: This method takes the following parameters:
- x: The BigInteger number whose log is to be found.
- mode: The rounding mode for calculating the log of 10.
Return Value: This method returns the base-10 logarithm of x, rounded according to the specified rounding mode.
Exceptions: This method throws the following exceptions:
- IllegalArgumentException: if x <= 0.
- ArithmeticException: if mode is RoundingMode.UNNECESSARY and x is not a power of ten.
Enum RoundingMode
Enum Constant |
Description |
CEILING |
Rounding mode to round towards positive infinity. |
DOWN |
Rounding mode to round towards zero. |
FLOOR |
Rounding mode to round towards negative infinity. |
HALF_DOWN |
Rounding mode to round towards “nearest neighbor” unless both neighbors are equidistant, in which case round down. |
HALF_EVEN |
Rounding mode to round towards the “nearest neighbor” unless both neighbors are equidistant, in which case, round towards the even neighbor. |
HALF_UP |
Rounding mode to round towards “nearest neighbor” unless both neighbors are equidistant, in which case round up. |
UNNECESSARY |
Rounding mode to assert that the requested operation has an exact result, hence no rounding is necessary. |
UP |
Rounding mode to round away from zero. |
Below examples illustrates the BigIntegerMath.log10() method:
Example 1:
import java.math.*;
import com.google.common.math.BigIntegerMath;
class GFG {
public static void main(String args[])
{
BigInteger a1 = BigInteger.valueOf( 10000 );
System.out.println( "Log base 10 of " + a1
+ " with rounding mode HALF_EVEN = "
+ BigIntegerMath
.log10(a1,
RoundingMode.HALF_EVEN));
BigInteger a2 = BigInteger.valueOf( 15 );
System.out.println( "Log base 10 of " + a2
+ " with rounding mode HALF_DOWN = "
+ BigIntegerMath
.log10(a2,
RoundingMode.HALF_DOWN));
}
}
|
Output:
Log base 10 of 10000 with rounding mode HALF_EVEN = 4
Log base 10 of 15 with rounding mode HALF_DOWN = 1
Example 2: To show IllegalArgumentException
import java.math.*;
import com.google.common.math.BigIntegerMath;
class GFG {
public static void main(String args[])
{
try {
BigInteger a1 = BigInteger.valueOf(- 5 );
System.out.println( "Log base 10 of " + a1
+ " with rounding mode HALF_EVEN = "
+ BigIntegerMath
.log10(a1,
RoundingMode.HALF_EVEN));
}
catch (Exception e) {
System.out.println( "Exception: " + e);
}
}
}
|
Output:
Exception: java.lang.IllegalArgumentException: x (-5) must be > 0
Reference: https://google.github.io/guava/releases/21.0/api/docs/com/google/common/math/BigIntegerMath.html#log10-java.math.BigInteger-java.math.RoundingMode-
Last Updated :
15 Nov, 2018
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