package elte.java2_utikalauz5.math;

import java.math.*;
import java.util.Random;

/**
BigInteger használata.

@link.forrásfájl {@docRoot}/../data/math/src BigInt.java
@link.letöltés {@docRoot}/../data/math BigInt.jar
@since Java 2 Útikalauz programozóknak
*/
class BigInt {
 public static void main(String args[]) {
	System.out.println(new BigInteger(new byte[]{0x1, 0}));             // 256
	System.out.println(new BigInteger(new byte[]{(byte)128}));            // -128
	 // BigInteger(int signum, byte[] magnitude)
	System.out.println(new BigInteger(1, new byte[]{(byte)128}));             // 128
	System.out.println(new BigInteger(0, new byte[]{(byte)0}));             // 0
	System.out.println(new BigInteger(0, new byte[]{}));             // 0
	try {
	    System.out.println(new BigInteger(0, new byte[]{(byte)128}));
	} catch (Exception e) {
	    System.out.println(e);    // NumberFormatEx
	}
	System.out.println(new BigInteger(-1, new byte[]{(byte)128}));              // -128
	 // BigInteger(int numBits, Random rnd)
	System.out.println(new BigInteger(0, new Random()));             // 0
	System.out.println(new BigInteger(1, new Random()));             // 1
	try {
	    System.out.println(new BigInteger(-1, new Random()));
	} catch (Exception e) {
	    System.out.println(e);    // IllegalArgumentEx
	}
	System.out.println(new BigInteger(32, new Random()));
	 // BigInteger(int numBits, int certainty, Random rnd)
	System.out.println(new BigInteger(32, 0, new Random()));
	System.out.println(new BigInteger(32, 1000, new Random()));
	System.out.println(new BigInteger(32, -10, new Random()));

	System.out.println(BigInteger.valueOf(0).gcd(BigInteger.valueOf(0)));     // 0
	System.out.println(BigInteger.valueOf(0).gcd(BigInteger.valueOf(1)));     // 1
	System.out.println(BigInteger.valueOf(1).gcd(BigInteger.valueOf(0)));     // 1
	System.out.println(BigInteger.valueOf(1).gcd(BigInteger.valueOf(1)));     // 1
	System.out.println(BigInteger.valueOf(5).gcd(BigInteger.valueOf(3)));     // 1
	System.out.println(BigInteger.valueOf(25).gcd(BigInteger.valueOf(10)));   // 5
	System.out.println(BigInteger.valueOf(-25).gcd(BigInteger.valueOf(10)));  // 5
	Random rnd = new Random();
	for (int i=1; i<100; i++) {
	 BigInteger a = new BigInteger(64, rnd);
	 BigInteger b = new BigInteger(64, rnd);
	 System.out.println("gcd("+a+","+b+")="+a.gcd(b));
	}

 }
}