Java Math scalb() Method
The scalb() method of Java Math class returns a single perfectly rounded product of floating-point and member of the double value set as if performed by d*2scaleFacor rounded value.
Syntax:
- public static double scalb(double d, int scaleFactor)
- public static float scalb(float d,int scaleFactor)
Parameters:
The parameter ‘d’ represents the number to be scaled by a power of 2 and ‘scaleFactor’ represents power of 2 used to scale d.
Return Value:
The scalb() method computes the rounded value for d*2scaleFacor.
Example 1:
public class JavaMathScalbExample1 {
static int i=1;
public static void main(String[] args) {
double d=0.5d;
int scaleFactor=9;
//returns a single perfectly rounded product of floating-point
System.out.println(i++ +". Value : " +Math.scalb(d,scaleFactor));
}
}
Output:
Value : 256.0
Example 2:
public class JavaMathScalbExample2 {
static int i=1;
public static void main(String[] args) {
double d=2;
int scaleFactor=0;
//returns d if the scaleFactor's value is 0
System.out.println(i++ +". Value : " +Math.scalb(d,scaleFactor));
}
}
Output:
Value : 2.0
Example 3:
public class JavaMathScalbExample3 {
static int i=1;
public static void main(String[] args) {
double d=Double.NaN;
int scaleFactor=Integer.MIN_VALUE;
//returns NaN, if either argument is NaN
System.out.println(i++ +". Value : " +Math.scalb(d,scaleFactor));
}
}
Output:
Value : NaN
Example 4:
public class JavaMathScalbExample4{
static int i=1;
public static void main(String[] args) {
double d=Double.POSITIVE_INFINITY;
int scaleFactor=1;
//returns Infinity, if d is Infinite
System.out.println(i++ +". Value : " +Math.scalb(d,scaleFactor));
}
}
Output:
Value : Infinity
Example 5:
public class JavaMathScalbExample5 {
static int i=1;
public static void main(String[] args) {
float d=Float.NEGATIVE_INFINITY;
int scaleFactor=1;
//returns NEGATIVE Infinity, if d is NEGATIVE Infinite
System.out.println(i++ +". Value : " +Math.scalb(d,scaleFactor));
}
}
Output:
Value : -Infinity