The floorPowerOfTwo() method of Guava’s IntMath class accepts a parameter and returns the largest power of two less than the value passed in the parameter. This is equivalent to: checkedPow(2, log2(x, FLOOR)).
Syntax :
public static int floorPowerOfTwo(int x)
Parameters: This method accepts a single parameter x which is an integral value.
Return Value : The method returns the largest power of two less than or equal to x.
Exceptions : The method floorPowerOfTwo(int x) throws IllegalArgumentException if x <= 0.
Example 1 :
// Java code to show implementation // of floorPowerOfTwo(int x) method // of Guava's IntMath class import java.math.RoundingMode;
import com.google.common.math.IntMath;
class GFG {
// Driver code
public static void main(String args[])
{
int n1 = 10 ;
// Using floorPowerOfTwo(int x) method
// of Guava's IntMath class
int ans1 = IntMath.floorPowerOfTwo(n1);
System.out.println( "Largest power of 2 less "
+ "than or equal to " + n1 + " is : " + ans1);
int n2 = 127 ;
// Using floorPowerOfTwo(int x) method
// of Guava's IntMath class
int ans2 = IntMath.floorPowerOfTwo(n2);
System.out.println( "Largest power of 2 less "
+ "than or equal to " + n2 + " is : " + ans2);
}
} |
Output :
Largest power of 2 less than or equal to 10 is : 8 Largest power of 2 less than or equal to 127 is : 64
Example 2 :
// Java code to show implementation // of floorPowerOfTwo(int x) method // of Guava's IntMath class import java.math.RoundingMode;
import com.google.common.math.IntMath;
class GFG {
static int findFloorPow( int x)
{
try {
// Using floorPowerOfTwo(int x)
// method of Guava's IntMath class
// This should raise "IllegalArgumentException"
// as x <= 0
int ans = IntMath.floorPowerOfTwo(x);
// Return the answer
return ans;
}
catch (Exception e) {
System.out.println(e);
return - 1 ;
}
}
// Driver code
public static void main(String args[])
{
int x = - 3 ;
try {
// Function calling
findFloorPow(x);
}
catch (Exception e) {
System.out.println(e);
}
}
} |
Output :
java.lang.IllegalArgumentException: x (-3) must be > 0