JAVA课程02

package 成绩等级;

import java.util.*;

public class 成绩等级 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner s = new Scanner(System.in);
        
        int a;
        a = s.nextInt();
        
        if(a > 90)
            System.out.println("A");
        else if(a >= 75 && a <= 89)
            System.out.println("B");
        else if(a >= 60 && a <= 74)
            System.out.println("C");
        else
            System.out.println("D");
    }

}