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.

 `// 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); ` `    ``} ` `} `

Output:

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

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