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Java scalb Function

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The Java scalb Function is one of the Java Math Library function which is used to return x * 2ScaleFactor rounded as if performed by a single correctly rounded floating-point multiply to a member of the double value set. In this article we will show you, How to use Math.scalb function in Java Programming language with example.

Java scalb Function syntax

The basic syntax of the Math.scalb Function in Java Programming language is as shown below:

Math.scalb(data_type number, int ScaleFactor);
  • number: Please specify the double value or specify any expression here.
  • ScaleFactor: Please specify the Scale Factor value here.

For example, if number = 2 and ScaleFactor = 3 then, Math.scalb(3, 2) = 3 * 2² = 12. There are some special case where the result will be different and they are:

  • If the first argument is infinite, Math.scalb will return the result as Infinity of same sign.
  • If the first argument is positive or negative zero, Math.scalb will return the result as Zero of same sign.
  • and, if the first argument is not a Number, Java Math.scalb will return the result as NaN.

Java Programming provides two different Math.scalb Java functions to return number * 2ScaleFactor. Following function will accept positive or negative double value as first argument and returns the result

static double scalb(double number, int ScaleFactor); //Return Type is double

// In order to use in program: 
Math.scalb(double number, int ScaleFactor);

Following function will accept positive or negative float value as first argument and returns the result

static float scalb(float number, int ScaleFactor);//Return Type is float

// In order to use in program: 
Math.scalb(float number, int ScaleFactor);

Java scalb Function Example

The Java Math.scalb function is used to return number * 2ScaleFactor. In this example, We are going to find the same of different data types and display the output

JAVA CODE

// Java Math.scalb Function
package MathFunctions;

public class ScalbMethod {
	public static void main(String[] args) {
		double a = 10.9666, b = 14.6674, c = -9.474, d = -14.9865;
		float e = 1.23f, f = 4.809f, g = -7.89f, h = -6.54f;

		System.out.println("\nMath.scalb Result for Zero as Second argument = " + Math.scalb(2, 0));
		System.out.println("Math.scalb Result for Zero as First argument = " + Math.scalb(0, 2));

		System.out.println("\nMath.scalb Result of Positive Value = " + Math.scalb(2, 3));		
		System.out.println("Math.scalb Result of Negative Value = " + Math.scalb(-3, 5));
		System.out.println("Math.scalb Result of Negative Value = " + Math.scalb(3, -4));
		System.out.println("Math.scalb Result of Negative Value = " + Math.scalb(-2, -2));
		
		System.out.println("\nMath.scalb Result of Positive Doubles: " + Math.scalb(a, 4));
		System.out.println("Math.scalb Result of Negative Double Values: " + Math.scalb(c, 3));
		System.out.println("Math.scalb Result of both Positive & Negative Double Values: " + Math.scalb(b, -3));
		System.out.println("Math.scalb Result of both Positive & Negative Double Values: " + Math.scalb(d, -6));
		
		System.out.println("\nMath.scalb Result of Positive Float Values: " + Math.scalb(e, 5));
		System.out.println("Math.scalb Result of Negative Float Values: " + Math.scalb(g, 7));
		System.out.println("Math.scalb Result of both Positive & Negative Float Values: " + Math.scalb(f, -4));
		System.out.println("Math.scalb Result of both Positive & Negative Float Values: " + Math.scalb(h, -2));
	}
}

OUTPUT

Java scalb Function 1

ANALYSIS

First, We declared variables of type Double and Float to display the functionality of java Math.scalb function on different data types.

double a = 10.9666, b = 14.6674, c = -9.474, d = -14.9865;
float e = 1.23f, f = 4.809f, g = -7.89f, h = -6.54f;

Next, We used the Java Math.scalb Function directly on both the Positive and negative values.

System.out.println("\nMath.scalb Result of Positive Value = " + Math.scalb(2, 3));		
System.out.println("Math.scalb Result of Negative Value = " + Math.scalb(-3, 5));
System.out.println("Math.scalb Result of Negative Value = " + Math.scalb(3, -4));
System.out.println("Math.scalb Result of Negative Value = " + Math.scalb(-2, -2));

Next, We used the Java Math.scalb Function on variable a, b, c and d (they belongs to double type). Following statements will call the scalb method of double type ( static double scalb(double number, int ScaleFactor) ) to display the result.

System.out.println("\nMath.scalb Result of Positive Doubles: " + Math.scalb(a, 4));
System.out.println("Math.scalb Result of Negative Double Values: " + Math.scalb(c, 3));
System.out.println("Math.scalb Result of both Positive & Negative Double Values: " + Math.scalb(b, -3));
System.out.println("Math.scalb Result of both Positive & Negative Double Values: " + Math.scalb(d, -6));

Here, We used the Math.scalb Function on variable e, f, g and h (they belongs to float type). Following statements will call the scalb method of float type ( static float scalb(float number, int ScaleFactor) ) to display the result.

System.out.println("\nMath.scalb Result of Positive Float Values: " + Math.scalb(e, 5));
System.out.println("Math.scalb Result of Negative Float Values: " + Math.scalb(g, 7));
System.out.println("Math.scalb Result of both Positive & Negative Float Values: " + Math.scalb(f, -4));
System.out.println("Math.scalb Result of both Positive & Negative Float Values: " + Math.scalb(h, -2));

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