1. 题目

读题

考查点

2. 解法

思路

代码逻辑

具体实现

public class HJ57 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String num1 = sc.nextLine();
        String num2 = sc.nextLine();
        System.out.println(addStr(num1, num2));

    }

    public static String addStr(String num1, String num2) {
        StringBuffer sb = new StringBuffer();
        int sum = 0;
        int carry = 0;
        int i = num1.length() - 1, j = num2.length() - 1;
        while (i >= 0 || j >= 0 || carry > 0) {
            sum += carry;

            if (i >= 0) {
                sum += num1.charAt(i) - '0';
                i--;
            }
            if (j >= 0) {
                sum += num2.charAt(j) - '0';
                j--;
            }
            sb.append(sum % 10);
            carry = sum / 10;
            sum = 0;

        }
        return sb.reverse().toString();

    }
}