大数相乘和大数相加。

/*

*大数相乘 求n的阶乘。

*/

 

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

public class BigMultiply {

public static void main(String[] args) { Scanner sc = new Scanner(System.in); int N = sc.nextInt(); System.out.println(calcM(N)); }

public static String calcM(int n) { BigInteger one = new BigInteger(Integer.toString(1)); for (int i = 1; i <= n; i++) { one = one.multiply(new BigInteger(Integer.toString(i)));// 大数据的加减乘除用的是add、subtract、multiply、divide，remainder。 } return one.toString(); }

}

 

 

/*

大数相加

*/

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

public class BigPlus { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String arg1 = sc.nextLine(); String arg2 = sc.nextLine(); BigPlus big=new BigPlus(); System.out.println(big.plusBigNum(arg1, arg2)); }

public String plusBigNum(String arg1, String arg2) { BigInteger big1 = new BigInteger(arg1); BigInteger big2 = new BigInteger(arg2);// 将输入字符串转化为大数对象。 return big1.add(big2).toString();//toString注意。 }

}

 

转载于:https://www.cnblogs.com/wushuai-study/p/4737013.html