# Java.math.BigInteger.shiftLeft() Method

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## Description

The java.math.BigInteger.shiftLeft(int n) returns a BigInteger whose value is (this << n). The shift distance, n, may be negative, in which case this method performs a right shift. It computes floor(this * 2n).

## Declaration

Following is the declaration for java.math.BigInteger.shiftLeft() method.

public BigInteger shiftLeft(int n)

## Parameters

n − Shift distance, in bits.

## Return Value

This method returns a BigInteger object whose value is this << n.

## Exception

ArithmeticException − If the shift distance is Integer.MIN_VALUE.

## Example

The following example shows the usage of math.BigInteger.shiftLeft() method.

package com.tutorialspoint;

import java.math.*;

public class BigIntegerDemo {

public static void main(String[] args) {

// create 3 BigInteger objects
BigInteger bi1, bi2, bi3;

bi1 = new BigInteger("10");

// perform leftshift operation on bi1 using 2 and -2
bi2 = bi1.shiftLeft(2);
bi3 = bi1.shiftLeft(-2);

String str1 = "Leftshift on " + bi1 + ", 2 times gives " +bi2;
String str2 = "Leftshift on " + bi1 + ",-2 times gives " +bi3;

// print bi2, bi3 values
System.out.println( str1 );
System.out.println( str2 );
}
}

Let us compile and run the above program, this will produce the following result −

Leftshift on 10, 2 times gives 40
Leftshift on 10,-2 times gives 2

java_math_biginteger.htm

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