Java Guava | IntMath log10(int x, RoundingMode mode) method with Examples
Last Updated :
29 Jan, 2019
The log10(int x, RoundingMode mode) method of Guava’s IntMath Class accepts two parameters and calculates the base-10 logarithmic value of the first parameter rounded according to the rounding mode specified by the second parameter.
Syntax:
public static int log10(int x, RoundingMode mode)
Parameters: The method takes 2 parameters:
- x is the int value to be found log of.
- mode is the specified rounding mode.
Return Value : This method returns Base-10 logarithm of x, rounded according to the specified rounding mode.
Exceptions: This method throws following parameters:
- IllegalArgumentException: if the value x is 0 or a negative value.
- 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 given are some examples to understand the implementation in a better way :
Example 1 :
import java.math.RoundingMode;
import com.google.common.math.IntMath;
class GFG {
public static void main(String args[])
{
int a1 = 10000 ;
System.out.println(
IntMath.log10(a1,
RoundingMode.HALF_EVEN));
int a2 = 15 ;
System.out.println(
IntMath.log10(a2,
RoundingMode.HALF_DOWN));
}
}
|
Output :
4
1
Example 2 :
import java.math.RoundingMode;
import com.google.common.math.IntMath;
class GFG {
static int findlog10( int x, RoundingMode mode)
{
try {
int ans = IntMath.log10(x, mode);
return ans;
}
catch (Exception e) {
System.out.println(e);
return - 1 ;
}
}
public static void main(String args[])
{
int x = - 152 ;
try {
findlog10(x, RoundingMode.HALF_EVEN);
}
catch (Exception e) {
System.out.println(e);
}
}
}
|
Output :
java.lang.IllegalArgumentException: x (-152) must be > 0
Reference: https://google.github.io/guava/releases/20.0/api/docs/com/google/common/math/IntMath.html#log10-int-java.math.RoundingMode-
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