prerequisite : BigInteger Basics
The java.math.BigInteger.testBit(index) method returns true if and only if the designated bit is set. This method Computes (this & (1<<n)) != 0).
Syntax:
public boolean testBit(int n)
Parameter: The method takes one parameter n of integer type which refers to the index of the bit that needs to be tested.
Return Value: The method returns true if and only if the designated bit is set else it will return false.
Exception: The method will throw an ArithmeticException when n is negative.
Examples:
Input: BigInteger = 2300, n = 4 Output: true Explanation: Binary Representation of 2300 = 100011111100 bit at index 4 is 1 so set it means bit is set so method will return true Input: BigInteger = 5482549 , n = 1 Output: false
Below program illustrates the testBit() method of BigInteger.
// Program to demonstrate the testBit()// method of BigInteger import java.math.*; public class GFG { public static void main(String[] args) { // Creating a BigInteger object BigInteger biginteger = new BigInteger("2300"); // Creating an int i for index int i = 3; boolean flag = biginteger.testBit(i); String result = "The bit at index " + i + " of " + biginteger + " is set = " + flag; // Displaying the result System.out.println(result); }} |
Output:
The bit at index 3 of 2300 is set = true
Reference: https://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html#testBit(int)
