Grade.java

import java.util.Scanner;

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

            System.out.print("Enter your score : ");
            int score = scanner.nextInt();

            // nested if 
            if(score >= 90)
                System.out.println("A");
            else
                if(score >= 80)
                    System.out.println("B");
                else
                    if(score >= 70)
                        System.out.println("C");
                            else
                                if(score >= 60)
                                    System.out.println("D");
                                        else 
                                            System.out.println("E");
                

    }
}