import java.math.*;

public class BigIntegerExample {

    public static void main (String[] argv)
    {
        // Create two instances with 5 and 2 as actual values.
        BigInteger A = new BigInteger ("5");
        BigInteger B = new BigInteger ("2");

        // Examples of arithmetic operations:
        BigInteger C = A.add (B);               // 7
        BigInteger D = A.multiply (B);          // 10
        BigInteger E = A.divide (B);            // 2
        BigInteger F = A.mod (B);               // 1
        
        System.out.println ("A=" + A + " B=" + B + " C=" + C + " D=" + D + " E=" + E + " F=" + F);

        // Two constants.
        BigInteger zero = new BigInteger ("0");
        BigInteger one = new BigInteger ("1");

        BigInteger G = A.add (zero);            // 5
        BigInteger H = B.multiply (one);        // 2
        
        System.out.println ("G=" + G + " H=" + H);

        // Largest possible int.
        int x = 2147483647;
        int y = x*x;          // "Garbage" result
        System.out.println ("x=" + x + " y=" + y);
        
        // But this works fine:
        BigInteger X = new BigInteger ("2147483647");
        BigInteger Y = X.multiply (X);
        System.out.println ("X=" + X + " Y=" + Y);

        // And now for some really large integers ...

        // Some of the largest known primes in history, found without computers.
        // Largest known in 1588, by P.Cataldi:
        BigInteger P1 = new BigInteger ("524287");       
        // Next record in 1772, by Euler:
        BigInteger P2 = new BigInteger ("2147483647");   
        // Then in 1876 by Lucas:
        BigInteger P3 = new BigInteger ("170141183460469231731687303715884105727");
        // Next record in 1951 by Ferrier:
        BigInteger P4 = new BigInteger ("20988936657440586486151264256610222593863921");
    }
    
}