Grade Calculator

import java.util.Scanner;

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

        System.out.print("Enter percentage: ");
        double per = sc.nextDouble();

        char grade;
        if (per >= 90) {
            grade = 'A';
        } else if (per >= 80) {
            grade = 'B';
        } else if (per >= 70) {
            grade = 'C';
        } else if (per >= 60) {
            grade = 'D';
        } else {
            grade = 'F';
        }

        System.out.println("Grade = " + grade);

        sc.close();
    }
}