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.

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// 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);
    }
}

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Output:

After applying ShiftLeft by Shift Distance 3 on 2300 New Value is 18400

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




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