BigInteger divide() Method in Java with Examples

The java.math.BigInteger.divide(BigInteger val) is used to calculate the division of two BigIntegers. BigInteger class internally uses array of integers for processing, the operation on object of BigIntegers are not as fast as on primitives. This method performs an operation upon the current BigInteger by which this method is called and BigInteger passed as the parameter.

Syntax:

public BigInteger divide(BigInteger val)

Parameters: This method accepts a parameter val which is the value that divides this BigInteger.

Return value: This method returns a BigInteger which holds division (this / val) in Integer (non – floating point value) i.e. it rounds off the result to its floor value.

Exception: The parameter val must not be 0 otherwise Arithmetic Exception is thrown.

Below programs is used to illustrate the divide() method of BigInteger.

Example 1:

// Java program to demonstrate
// divide() method of BigInteger

import java.math.BigInteger;

public class GFG {
    public static void main(String[] args)
    {
        // BigInteger object to store result
        BigInteger div;

        // Two objects of String created
        // Holds the values to calculate the division
        String input1 = "400000000000000000"
                        + "000000000000000000";

        String input2 = "8000000";

        // Convert the string input to BigInteger
        BigInteger a
            = new BigInteger(input1);
        BigInteger b
            = new BigInteger(input2);

        // Using divide() method
        div = a.divide(b);

        // Display the result in BigInteger
        System.out.println("The division of\n"
                           + a + " \nby\n" + b + " "
                           + "\nis\n" + div);
    }
}

Output:

The division of
400000000000000000000000000000000000 
by
8000000 
is
50000000000000000000000000000

Example 2: To demonstrate how it rounds off the result

// Java program to demonstrate
// divide() method of BigInteger

import java.math.BigInteger;

public class GFG {
    public static void main(String[] args)
    {
        // BigInteger object to store result
        BigInteger div;

        // Two objects of String created
        // Holds the values to calculate the division
        String input1 = "456216545";

        String input2 = "21255132";

        // Convert the string input to BigInteger
        BigInteger a
            = new BigInteger(input1);
        BigInteger b
            = new BigInteger(input2);

        // Using divide() method
        div = a.divide(b);

        // Display the result in BigInteger
        System.out.println("The division of\n"
                           + a + " \nby\n" + b + " "
                           + "\nis " + div);

        double d = Double.parseDouble(input1)
                   / Double.parseDouble(input2);

        // Display result in double type
        // To match both the results
        System.out.print("Using double result is " + d);
    }
}

Output:

The division of
456216545 
by
21255132 
is 21
Using double result is 21.46383024109189

Example 3: To demonstrate Exception thrown when divided by 0

// Java program to demonstrate
// divide() method of BigInteger

import java.math.BigInteger;

public class GFG {
    public static void main(String[] args)
    {
        // BigInteger object to store result
        BigInteger div;

        // Two objects of String created
        // Holds the values to calculate the division
        String input1 = "456216545"
                        + "452133155";

        String input2 = "0";

        // Convert the string input to BigInteger
        BigInteger a
            = new BigInteger(input1);
        BigInteger b
            = new BigInteger(input2);

        // Using divide() method
        try {
            div = a.divide(b);

            // Display the result in BigInteger
            System.out.println("The division of\n"
                               + a + " \nby\n" + b + " "
                               + "\nis\n" + div + "\n");
        }
        catch (ArithmeticException e) {
            System.out.println(e);
        }
    }
}

Output:

java.lang.ArithmeticException: BigInteger divide by zero

Reference: https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/math/BigInteger.html#divide(java.math.BigInteger)