ACM Java 大数之BigInteger详解

别说话，看代码！

import java.math.BigInteger;
import java.util.Scanner;

public class BI {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//构造函数
		BigInteger a = BigInteger.valueOf(10);
		BigInteger b = BigInteger.valueOf(2000);
		System.out.println(a);
		System.out.println(b);
		
		//加法
		System.out.println(a.add(b));
		System.out.println(a.add(a));
		System.out.println(a.add(b).add(b));
		
		//减法
		System.out.println(a.subtract(a));
		System.out.println(a.subtract(b));
		System.out.println(b.subtract(a).subtract(a));
		
		//乘法
		System.out.println(a.multiply(a));
		System.out.println(a.multiply(b));
		System.out.println(a.multiply(b).multiply(b));
		
		//除法
		System.out.println(a.divide(a));
		System.out.println(a.divide(b));//10/2000=0
		System.out.println(b.divide(a));
		System.out.println(b.divide(a).divide(a));
		
		//取模
		BigInteger mod = BigInteger.valueOf(3);
		System.out.println(b.mod(mod));
	}
}

此篇博客中所讲述内容只有ACMJava大数常用方法，BigInteger详细说明：http://www.yiibai.com/java/math/java_math_bigdecimal.html

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