evelop a Java program that calculates the average of three floating-pointnumbers and displays a grade based on the average.

Sure, here is a simple Java program that calculates the average of three floating-point numbers and displays a grade based on the average.

import java.util.Scanner;

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

        System.out.println("Enter three floating-point numbers:");
        float num1 = input.nextFloat();
        float num2 = input.nextFloat();
        float num3 = input.nextFloat();

        float average = (num1 + num2 + num3) / 3;

        System.out.println("The average is: " + average);

        if (average >= 90) {
            System.out.println("Grade: A");
        } else if (average >= 80) {
            System.out.println("Grade: B");
        } else if (average >= 70) {
            System.out.println("Grade: C");
        } else if (average >= 60) {
            System.out.println("Grade: D");
        } else {
            System.out.println("Grade: F");
        }
    }
}

This program works as follows:

1. It prompts the user to enter three floating-point numbers.
2. It calculates the average of these numbers.
3. It prints the average.
4. It checks the average and prints the corresponding grade. If the average is 90 or above, it prints "Grade: A". If it's 80 or above but less than 90, it prints "Grade: B", and so on. If the average is less than 60, it prints "Grade: F".