Java calculates the sum of binary strings

Purpose:

Find the sum of binary strings.

(Recommended tutorial: java teaching video)

Title introduction:

Give you two binary strings, return their sum (using binary express).

The input is a non-empty string and only contains the numbers 1 and 0.

Example 1:

Input: a = “11”, b = “1”
Output: “100”

Example 2 :

Input: a = “1010”, b = “1011”
Output: “10101”

Prompt:

Each The string consists only of the characters '0' or '1'.
1 If the string is not "0", it does not contain leading zeros.

import java.util.Scanner;public class text1 {
    public static void main(String[] a){
        Scanner imput=new Scanner(System.in);
        System.out.println("请输入两个二进制数：");
        String a1,a2,a3;
        a1=imput.next();
        a2=imput.next();
        a3=Solution(a1,a2);
        System.out.println(a3);
    }
        public static String Solution(String a, String b) {
            StringBuilder ans = new StringBuilder();
            int ca = 0;
            for(int i = a.length() - 1, j = b.length() - 1;i >= 0 || j >= 0; i--, j--) {
                int sum = ca;
                sum += i >= 0 ? a.charAt(i) - '0' : 0;
                sum += j >= 0 ? b.charAt(j) - '0' : 0;
                ans.append(sum % 2);
                ca = sum / 2;
            }
            ans.append(ca == 1 ? ca : "");
            return ans.reverse().toString();
        }
    }

Running results:

Related tutorials: java introductory tutorial

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