JAVA_Grade_System

import java.util.Scanner;


public class StudentGrade {
    public static void main(String[] args) {
        int  mark;
        Scanner scanner;
        scanner = new Scanner(System.in);

        System.out.println("Enter Mark: ");
        mark = scanner.nextInt();

        if(mark>=90) System.out.print("A");

        else if(mark>=80){
            if(mark%10>=7) System.out.print("B+");
            else if(mark%10>=4) System.out.print("B");
            else System.out.print("B-");
        }

        else if(mark>=70){
            if(mark%10>=7) System.out.print("C+");
            else if(mark%10>=4) System.out.print("C");
            else System.out.print("C-");
        }

        else if(mark>=60){
            if(mark%10>=7) System.out.print("D+");
            else if(mark%10>=4) System.out.print("D");
            else System.out.print("D-");
        }

        else System.out.print("F");
    }
}