import java.util.Scanner;
public class Main {
// Returns a letter grade based on the average
static char gradeFunction(double avg) {
if (avg>= 90) return 'A';
else if (avg>= 80) return 'B';
else if (avg>= 70) return 'C';
else if (avg>= 60) return 'D';
else return 'F';
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("How many grades (1 to 5)? ");
int count = scanner.nextInt();
// Validate the input count
if (count < 1 || count> 5) {
System.out.println("Invalid number. You must enter between 1 and 5 grades.");
scanner.close();
return; // Exit
}
double sum = 0.0;
// Read each grade
for (int i = 1; i <= count; i++) { System.out.print("Enter grade " + i + ": "); double grade = scanner.nextDouble(); sum += grade; } double avg = sum / count; System.out.println("Average: " + avg); System.out.println("Letter grade: " + gradeFunction(avg)); scanner.close(); } }