Java.lang.StrictMath.scalb() Method


The java.lang.StrictMath.scalb(float f, int scaleFactor) method returns d × 2scaleFactor rounded as if performed by a single correctly rounded floating-point multiply to a member of the float value set.It include these cases −

  • If the first argument is NaN, NaN is returned. .
  • If the first argument is infinite, then an infinity of the same sign is returned.
  • If the first argument is zero, then a zero of the same sign is retrned.


Following is the declaration for java.lang.StrictMath.scalb() method

public static float scalb(float f, int scaleFactor)


  • f − This is the number to be scaled by a power of two.

  • scaleFactor − This is the power of 2 used to scale f.

Return Value

This method returns d × 2scaleFactor




The following example shows the usage of java.lang.StrictMath.scalb() method.

package com.tutorialspoint;

import java.lang.*;

public class StrictMathDemo {

   public static void main(String[] args) {

      float f1 = 5.0f , f2 = 9.56f, f3 = 0.0f;
      int power = 2;

      // returns (First argument*(pow(second argument,2) i.e d × 2scaleFactor

      float scalbValue = StrictMath.scalb(f1 , power); 
      System.out.println("value = " + scalbValue1);

      scalbValue = StrictMath.scalb(f2 , power); 
      System.out.println("value = " + scalbValue1);

      scalbValue = StrictMath.scalb(f3 , power); 
      System.out.println("value = " + scalbValue1);

Let us compile and run the above program, this will produce the following result −

value = 20.0
value = 38.24
value = 0.0