大数（字符串）相乘

最新推荐文章于 2022-02-24 22:53:11 发布

china3126

最新推荐文章于 2022-02-24 22:53:11 发布

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文章标签： java

原文链接：https://my.oschina.net/u/3676895/blog/2049742

版权

import java.util.Scanner;

/*** Copyright (C), 2002-2018, *******商务有限公司
 * FileName: BigDataMulti.java
  
 * Author:   ******
 * Date:     2018-09-11 18:07
 * Description: //模块目的、功能描述      
 * History: //修改记录
 * &lt;author&gt;      &lt;time&gt;      &lt;version&gt;    &lt;desc&gt;
 * 修改人姓名             修改时间            版本号                  描述
 */
public class BigDataMulti {

    public static void main(String [] args){

        System.out.println("请输入两个大数:");
        Scanner scan = new Scanner(System.in);
        String a1 = scan.nextLine();
        String a2 = scan.nextLine();
        // 关闭缓冲
        scan.close();

        int length1 = a1.length();
        int length2 = a2.length();

        int [] aint = new int[length1];
        int [] bint = new int[length2];
        int [] multint = new int [length1+length2];

        char [] char1 = a1.toCharArray();
        char [] char2 = a2.toCharArray();

        for (int i = 0; i < length1; i++) {
            aint[i] = char1[i] - '0';
        }

        for (int i = 0; i < length2; i++) {
            bint [i] = char2[i] - '0';
        }

        for (int i = 0; i < aint.length; i++) {
            for (int j = 0; j < bint.length; j++) {
                multint[i+j] += aint[i] * bint[j];
            }
        }

        for (int i = multint.length-1; i > 0 ; i--) {
            multint[i-1] += multint[i]/10;
            multint[i] = multint[i] % 10;
        }

        System.out.println("计算结果如下");
        for (int i = 0; i < multint.length-1; i++) {
            System.out.print(multint[i]);
        }
    }
}