IPAM GRADING SYSTEM

 import java.util.Scanner;

public class even {
    public static void main(String[] args) {
        System.out.println("Enter module 1");
        Scanner input = new Scanner(System.in);
        while (!input.hasNextDouble()) {
            System.out.println("Enter a number not a letter");
            input.next();
        }
        int module1;
        module1 = input.nextInt();
        while (module1 < 0 || module1 > 100) {
            System.out.println("Enter a number between 1 and 100");
            while (!input.hasNextDouble()) {
                System.out.println("Enter a number not a letter");
                input.next();
            }
            module1 = input.nextInt();
            if (module1 >= 70) {
                System.out.println("A");
            }
            else if (module1 >= 60 && module1 <= 69) {
                System.out.println("B");
            }
            else if (module1 >= 50 && module1 <= 59) {
                System.out.println("C");
            }
            else if (module1 >= 40 && module1 <= 49) {
                System.out.println("C");
            }
            else if (module1 >= 0 && module1 <= 39) {
                System.out.println("F");
            }
        }
    }}