Listing 3: Using Java's BigInt class
import java.math.*; // For BigInteger public class BigInt { public static void main(String[] args) { // Build a number with 40 digits: String s = "12345678901234567890" + "12345678901234567890"; BigInteger b = new BigInteger(s); BigInteger one = BigInteger.valueOf(1); BigInteger two = BigInteger.valueOf(2); BigInteger b2 = b.add(one); System.out.println("b has " + b.bitCount() + " bits"); System.out.println("b mod 2 = " + b.mod(two)); System.out.println("b2 mod 2 = " + b2.mod(two)); System.out.println("b2 - b = " + b2.subtract(b)); } } /* Output: b has 68 bits // 2's-complement b mod 2 = 0 // even b2 mod 2 = 1 // odd b2 - b = 1 */ - End of Listing -