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Java Math getExponent() method with Example

  • Last Updated : 09 Apr, 2018

The java.lang.Math.getExponent() returns the unbiased exponent used in the representation of a double or float.
Note:

  • If the argument is NaN or infinite of double or float type, then the result is (Double.MAX_EXPONENT + 1) or (Float.MAX_EXPONENT + 1).
  • If the argument is zero or subnormal of double or float type, then the result is (Double.MIN_EXPONENT -1) or (Float.MIN_EXPONENT -1).

Syntax :

public static int getExponent(DataType a)
Parameter :
a : an argument of double or float type
Return :
This method returns the unbiased exponent of the argument.




// Java program to demonstrate working
// of java.lang.Math.getExponent() method
import java.lang.Math;
  
class Gfg {
  
    // driver code
    public static void main(String args[])
    {
        double a = 345.65;
        double b = 1.0 / 0;
        double c = 0;
  
        // Input double value
        // Output unbiased exponent of it
        System.out.println(Math.getExponent(a));
  
        // Input Infinity
        // Output (Double.MAX_EXPONENT + 1)
        System.out.println(Math.getExponent(b));
  
        // Input Zero
        // Output (Double.MIN_EXPONENT - 1)
        System.out.println(Math.getExponent(c));
  
        float d = 237.2f;
        float e = 1.0f / 0;
        float f = 0f;
  
        // Input float value
        // Output unbiased exponent of it
        System.out.println(Math.getExponent(d));
  
        // Input Infinity
        // Output (Float.MAX_EXPONENT + 1)
        System.out.println(Math.getExponent(e));
  
        // Input Zero
        // Output (Float.MIN_EXPONENT - 1)
        System.out.println(Math.getExponent(f));
    }
}

Output:

8
1024
-1023
7
128
-127

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