StrictMath scalb() Method in Java

  1. The scalb(double num, int scale) is an inbuilt method of StrictMath class in Java which is used to calculate num * 2^scale and rounded as performed by a single correctly rounded floating point multiplied to a member of the double value argument.
    • The result is calculated accurately when the exponent of the result is between Double.MIN_EXPONENT and Double.MAX_EXPONENT.
    • An infinity is returned when the exponent of the result is greater than Double.MAX_EXPONENT.
    • When the result is subnormal then the correctness may be lost which means when scalb(num, scale) is subnormal, scalb(scalb(num, scale), -scale) may not equal num.
    • The result is NaN when the num is NaN
    • The result is an infinity of the same sign of num when num is infinite
    • The result will be a zero of the same sign when the num is zero.

    Syntax:

    public static double scalb(double num, int scale)

    Parameters: The method accepts two parameter:

    • num : This is of double type and refers to number to be scaled by a power of 2.
    • scalb : This is of integer type and refers to the power of 2 used to scale num.

    Return Value : The method returns the num × 2^scale.



    Examples :

    Input: num = 7
           scalb = 2
    Output: 28
    

    Below program illustrate the java.lang.StrictMath.scalb() method.

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    // Java praogram to illustrate the
    // java.lang.StrictMath.scalb() 
    import java.lang.*;
      
    public class Geeks {
      
    public static void main(String[] args) {
      
        double num1 = 12 , num2 = -7.2, num3 = 0.0;
        int scalb = 2;
      
        double scalb_Value = StrictMath.scalb(num1, scalb); 
        System.out.println("Output = "+scalb_Value);
      
        scalb_Value = StrictMath.scalb(num2, scalb); 
        System.out.println("Output = " +scalb_Value);
      
        scalb_Value = StrictMath.scalb(num3, scalb); 
        System.out.println("Output = "+scalb_Value);
    }
    }

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    Output:

    Output = 48.0
    Output = -28.8
    Output = 0.0
    
  2. The scalb(float num, int scale) is the inbuilt method of StrictMath class in Java to calculate num * 2^scale and rounded as performed by a single correctly rounded floating point multiplied to a member of the float value argument.
    • The result is calculated accurately when the exponent of the result is between Float.MIN_EXPONENT and Float.MAX_EXPONENT.
    • An infinity is returned when the exponent of the result greater than Float.MAX_EXPONENT.
    • When the result is subnormal then the correctness may be lost which means when scalb(num, scale) is subnormal, scalb(scalb(num, scale), -scale) may not equal num.
    • The result is NaN when the num is NaN
    • The result is an infinity of the same sign of num when num is infinite
    • The result will be a zero of the same sign when the num is zero.

    Syntax :

    public static float scalb(float num, int scale)

    Parameters: The method accepts two parameter:

    • num : This is of float type and refers to number to be scaled by a power of 2.
    • scalb : This is of integer type and refers to the power of 2 used to scale num.

    Return Value : The method returns the num × 2^scale.

    Examples :

    Input: num = 2.5f
           scalb = 4
    Output: 40.0
    

    Below program illustrate the java.lang.StrictMath.scalb() method.

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    // Java praogram to illustrate the
    // java.lang.StrictMath.scalb() 
    import java.lang.*;
      
    public class Geeks {
      
    public static void main(String[] args) {
      
        float num1 = 8.3f, num2 = -4.2f, num3 = 0.0f;
        int scalb = 3;
      
        float scalb_Value = StrictMath.scalb(num1, scalb); 
        System.out.println("Output = "+scalb_Value);
      
        scalb_Value = StrictMath.scalb(num2, scalb); 
        System.out.println("Output = " +scalb_Value);
      
        scalb_Value = StrictMath.scalb(num3, scalb); 
        System.out.println("Output = "+scalb_Value);
    }
    }

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    Output:

    Output = 66.4
    Output = -33.6
    Output = 0.0
    


My Personal Notes arrow_drop_up

lets make it a lil simple

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