【数组】大数加法（正整数）

题目描述：输入 A，B两个正整数， 0 < = A,B < 10^100
输入格式：输入两个整数
输出格式：输出两个整数的和
输入样例：1 999999999999999999999
输出样例：1000000000000000000000

package com.gtt;

import java.util.Scanner;

/**
 * @Description
 * @Author 
 * @Data 2022/8/16 13:23
 */
public class LargeNumbersSum {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String big1 = scanner.next();
        String big2 = scanner.next();
        int length = big1.length() >= big2.length() ? big1.length()  : big2.length() ;
        char[] chars1 = new StringBuffer(big1).reverse().toString().toCharArray();
        char[] chars2 = new StringBuffer(big2).reverse().toString().toCharArray();

        int[] result = new int[length+1];

        for (int i = 0; i < length+1; i++) {
            int num1 = i < big1.length() ? (chars1[i] - '0') : 0;
            int num2 = i < big2.length() ? (chars2[i] - '0') : 0;
            result[i] = num1 + num2;
        }

        for (int i = 0; i < length + 1; i++) {
            if (result[i] >= 10) {
                result[i + 1] += result[i] / 10;
                result[i] = result[i] % 10;
            }
        }
        boolean isZero=true;
        StringBuilder stringBuilder = new StringBuilder();

        for (int i = result.length - 1; i >= 0; i--) {
            if (result[i] == 0 && isZero) {
                continue;
            } else {
                isZero = false;
            }
            stringBuilder.append(result[i]);
        }
        System.out.println(stringBuilder);
    }
}

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