what is the 2nd requirement ?

Question about the task

Arithmetic mean

Java Syntax, Level 5, Lesson 5

Under discussion

Use the keyboard to enter numbers, and then calculate the arithmetic mean.
If the user enters -1, display the arithmetic mean of all entered numbers and end the program.
-1 should not be included in the calculation.

Here are some examples:
a) if you enter the numbers
1
2
2
4
5
-1
then we display
2.8

b) if you enter the numbers
4
3
2
1
-1
then we display
2.5

Hint: one of the solutions to this problem uses the following construct:

while (true) {
    int number = read the number;
    if (check whether the number is -1)
        break;
}

Requirements:

The program must read data from the keyboard.
The program should display data on the screen.
After entering -1, the program must correctly terminate.
If you sequentially enter the numbers 1, 2, 2, 4, 5 and -1, the program should display 2.8.
If you sequentially enter the numbers -100, 0, 100, and -1, the program should display 0.0.
If you sequentially enter the numbers 1 and -1, the program should display 1.0.
The displayed result should match the task conditions for any input data.

package com.codegym.task.task05.task0507; /* Arithmetic mean */ import java.util.Arrays; import java.util.Scanner; public class Solution { public static void main(String[] args) throws Exception { Scanner sc = new Scanner(System.in); int i=0; float sum=0; int a[] = new int[20]; a[i]=sc.nextInt(); while(a[i]!=-1) { sum = sum + a[i]; i++; a[i]= sc.nextInt(); } float mean = sum/i++; System.out.println(mean); } }