시험 성적 (9498)

Java 11

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

public class Main {

    public static void main(String[] args) throws IOException {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int grade = Integer.parseInt(br.readLine());
        br.close();

        StringBuilder sb = new StringBuilder();
        
        switch ( grade/10 ) {
            case 10:
            case 9:
                sb.append("A");
                break;
            case 8:
                sb.append("B");
                break;
            case 7:
                sb.append("C");
                break;
            case 6:
                sb.append("D");
                break;
            default :
                sb.append("F");
                break;
        }

        System.out.print(sb);

    }
}