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BigDecimal subtract() Method in Java with Examples

  • Difficulty Level : Hard
  • Last Updated : 27 May, 2019

The java.math.BigDecimal.subtract(BigDecimal val) is used to calculate the Arithmetic difference of two BigDecimals. This method is used to find the arithmetic difference of large numbers without compromising with the precision of the result. This method performs an operation upon the current BigDecimal by which this method is called and BigDecimal passed as the parameter.

There are two overloads of subtract method available in java which are listed below:

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  • subtract(BigDecimal val)
  • subtract(BigDecimal val, MathContext mc)

subtract(BigDecimal val)

Syntax:

public BigDecimal subtract(BigDecimal val)

Parameters: This method accepts a parameter val which is the value to be subtracted from this BigDecimal.



Return value: This method returns a BigDecimal which holds difference (this – val), and whose scale is max(this.scale(), val.scale()).

Below programs is used to illustrate the subtract() method of BigDecimal.




// Java program to demonstrate
// subtract() method of BigDecimal
  
import java.math.BigDecimal;
  
public class GFG {
    public static void main(String[] args)
    {
        // BigDecimal object to store result
        BigDecimal diff;
  
        // For user input
        // Use Scanner or BufferedReader
  
        // Two objects of String created
        // Holds the values to calculate the difference
        String input1
            = "545456468445645468464645";
        String input2
            = "425645648446468486486452";
  
        // Convert the string input to BigDecimal
        BigDecimal a
            = new BigDecimal(input1);
        BigDecimal b
            = new BigDecimal(input2);
  
        // Using subtract() method
        diff = a.subtract(b);
  
        // Display the result in BigDecimal
        System.out.println("The difference of\n"
                           + a + " \nand\n" + b + " "
                           + "\nis\n" + diff + "\n");
    }
}

Output:

The difference of
545456468445645468464645
and
425645648446468486486452
is
119810819999176981978193

subtract(BigDecimal val, MathContext mc)

Syntax:

public BigDecimal subtract(BigDecimal val, MathContext mc)

Parameters: This method accepts two parameter, one is val which is the value to be subtracted from this BigDecimal and a mc of type MathContext.

Return value: This method returns a BigDecimal which holds difference (this – val), with rounding according to the context settings.

Below programs is used to illustrate the subtract() method of BigDecimal.




// Java program to demonstrate
// subtract() method of BigDecimal
  
import java.math.*;
  
public class GFG {
    public static void main(String[] args)
    {
        // BigDecimal object to store result
        BigDecimal diff;
  
        // For user input
        // Use Scanner or BufferedReader
  
        // Two objects of String created
        // Holds the values to calculate the difference
        String input1
            = "468445645468464645";
        String input2
            = "4256456484464684864864";
  
        // Convert the string input to BigDecimal
        BigDecimal a
            = new BigDecimal(input1);
        BigDecimal b
            = new BigDecimal(input2);
  
        // Set precision to 10
        MathContext mc
            = new MathContext(10);
        // Using subtract() method
        diff = a.subtract(b, mc);
  
        // Display the result in BigDecimal
        System.out.println("The difference of\n"
                           + a + " \nand\n" + b + " "
                           + "\nis\n" + diff + "\n");
    }
}

Output:

The difference of
468445645468464645
and
4256456484464684864864
is
-4.255988039E+21

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




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