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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