(문자열) (JAVA) 10953 A+B-6

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class BackJoon10953 {

	public static void main(String[] args) throws IOException{
		
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
		int n = Integer.parseInt(br.readLine());
		
		for(int i=0;i<n;i++) {
			String input = br.readLine();
			
			int a = input.charAt(0)-48;
			int b = input.charAt(2)-48;
			
			bw.write(a+b+"\n");
			
		}
              bw.close();
              
	}

}
/*아스키코드
char 0~9 는 48~57
char A~Z 는 65~90
char a~z  는 97~122
 * 
 */

- 문자열 1을 charAt로 자른 1은 49가 된다.