BigInteger shiftLeft() Method in Java

The java.math.BigInteger.shiftLeft(int n) method returns a BigInteger whose value is (this << n). The shift distance, n, may be negative, in which case this method performs a right shift.shiftLeft() method will moves each digit in a number's binary representation left by n times and the last bit in the direction of the shift is replaced by 0. This ShiftLeft() method Computes floor(this * 2^n). Syntax:

public BigInteger shiftLeft(int n)

Parameters: The method takes one parameter n of integer type, which refers to the shift distance, in bits. Return Value: The method returns the BigInteger after shifting the bits to left by n times. Exceptions: The method might throw an ArithmeticException if the shift distance is Integer.MIN_VALUE. Examples:

Input: value = 2300, shift distance = 3
Output: 18400
Explanation:
Binary Representation of 2300 = 100011111100
shift distance = 3
after shifting 100011111100 left 3 times then
Binary Representation becomes 100011111100000
and Decimal equivalent of 100011111100000 is 18400.

Another way of expressing the same can be 2300*(2^3)=18400

Input: value = 35000, index = 5
Output: 1120000

Below program illustrate shiftLeft(index) method of BigInteger. Java

// Program to demonstrate shiftLeft() method of BigInteger 

import java.math.*;

public class GFG {

    public static void main(String[] args)
    {

        // Creating BigInteger object
        BigInteger biginteger = new BigInteger("2300");

        // Creating a int i for Shift Distance
        int i = 3;

        // Call shiftLeft() method on bigInteger at index i
        // store the return value as BigInteger
        BigInteger changedvalue = biginteger.shiftLeft(i);

        String result = "After applying ShiftLeft by Shift Distance " + i
                        + " on " + biginteger + " New Value is " + changedvalue;

        // Printing result
        System.out.println(result);
    }
}

Reference: https://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html#shiftLeft(int)