import java.util.Scanner;

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

        System.out.print("Enter the student's score: ");
        int score = scanner.nextInt();

        char grade = getGradeSwitch(score);

        System.out.println("Grade: " + grade);
    }

    public static char getGradeSwitch(int score) {
        int range = score / 10;

        switch (range) {
            case 10:
            case 9:
                return 'A';
            case 8:
                return 'B';
            case 7:
                return 'C';
            case 6:
                return 'D';
            default:
                return 'F';
        }
    }
}



USING IF -ELSE

import java.util.Scanner;

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

        System.out.print("Enter the student's score: ");
        int score = scanner.nextInt();

        char grade = getGradeIfElse(score);

        System.out.println("Grade: " + grade);
    }

    public static char getGradeIfElse(int score) {
        if (score >= 90 && score <= 100) {
            return 'A';
        } else if (score >= 80 && score < 90) {
            return 'B';
        } else if (score >= 70 && score < 80) {
            return 'C';
        } else if (score >= 60 && score < 70) {
            return 'D';
        } else if (score >= 0 && score < 60) {
            return 'F';
        } else {
            // Handle invalid score (outside the range 0-100)
            System.out.println("Invalid score. Please enter a score between 0 and 100.");
            return '\0'; // '\0' is used to represent an undefined character
        }
    }
}