백준 2754 (학점 계산)

import java.util.Scanner;
 
public class baekjoon_2754 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String input = scan.nextLine();
        float a = 0f;
 
        if(input.charAt(0)=='A') {
            a += 4.0;
            if(input.charAt(1)=='+') {
                a += 0.3;
            }
            else if(input.charAt(1)=='-') {
                a -= 0.3;
            }
            System.out.print(a);
        }
        else if(input.charAt(0)=='B') {
            a += 3.0;
            if(input.charAt(1)=='+') {
                a += 0.3;
            }
            else if(input.charAt(1)=='-') {
                a -= 0.3;
            }
            System.out.print(a);
        }
        else if(input.charAt(0)=='C') {
            a += 2.0;
            if(input.charAt(1)=='+') {
                a += 0.3;
            }
            else if(input.charAt(1)=='-') {
                a -= 0.3;
            }
            System.out.print(a);
        }
        else if(input.charAt(0)=='D') {
            a += 1.0;
            if(input.charAt(1)=='+') {
                a += 0.3;
            }
            else if(input.charAt(1)=='-') {
                a -= 0.3;
            }
            System.out.print(a);
        }
        else {
            System.out.print(0.0);
        }
    }
}