BigDecimal ulp() Method in Java

The java.math.BigDecimal.ulp() is an inbuilt method in Java that returns the size of an ulp(unit in the last place) of this BigDecimal.

An ulp of a nonzero BigDecimal value is defined as the positive distance between this value and the BigDecimal value next larger in magnitude with the same number of digits.
An ulp of a zero value is numerically equal to 1 with the scale of this. The result is stored with the same scale as this so the result for zero and nonzero values is equal to [1, this.scale()].

Syntax:

public BigDecimal ulp()

Parameter: The method does not accept any parameter.

Return value: This method returns the size of an ulp of BigDecimal.

Examples:

Input: 4.25
Output: 0.01

Input: 1789
Output: 1

Below programs illustrates the above mentioned method:
Program 1:

// Program to illustrate the ulp() method of BigDecimal  
  
import java.math.*; 
  
public class gfg { 
  
    public static void main(String[] args) 
    { 
  
        // Assigning BigDecimal object 
        BigDecimal b1 = new BigDecimal("1789"); 
        BigDecimal b2 = new BigDecimal("4.25"); 
  
        // Assigning ulp value of BigDecimal object b1, b2 to b3, b4 
        BigDecimal b3 = b1.ulp(); 
        BigDecimal b4 = b2.ulp(); 
  
        // Printing b3, b4 values 
        System.out.println("ULP value of " + b1 + " is " + b3); 
        System.out.println("ULP value of " + b2 + " is " + b4); 
    } 
} 

Output:

ULP value of 1789 is 1
ULP value of 4.25 is 0.01

Program 2:

// Program to illustrate the ulp() method of BigDecimal  
  
import java.math.*; 
  
public class gfg { 
  
    public static void main(String[] args) 
    { 
  
        // Assigning BigDecimal object 
        BigDecimal b1 = new BigDecimal("78645"); 
        BigDecimal b2 = new BigDecimal("4.252547"); 
  
        // Assign ulp value of BigDecimal object b1, b2 to b3, b4 
        BigDecimal b3 = b1.ulp(); 
        BigDecimal b4 = b2.ulp(); 
  
        // Printing b3, b4 values 
        System.out.println("ULP value of " + b1 + " is " + b3); 
        System.out.println("ULP value of " + b2 + " is " + b4); 
    } 
} 

Output:

ULP value of 78645 is 1
ULP value of 4.252547 is 0.000001

Reference: https://docs.oracle.com/javase/7/docs/api/java/math/BigDecimal.html#ulp()

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