Java program to average grades

Write a function that accepts the "number of grades" from the user and returns the average of the grades entered by the user.
Output:

How many grades: 5
Enter the grade 1: 80.54
Enter the grade 2: 96.34
Enter the grade 3: 78.45
The average is 84.666664

Implementation:

import java.util.*; import java.lang.*; import java.io.*; class CodeRegister { public static void main (String[] args) throws java.lang.Exception { Scanner in = new Scanner(System.in); System.out.println("How many grades:"); int n = in.nextInt(); float x; int sum = 0; float average; for(int i=0;i<n;i++) { System.out.println("Enter the grade "+(i+1)+":"); x = in.nextFloat(); sum += x; } average = (float)sum / (float)n; System.out.println("The average is "+average); } }