Quite confused with this

Question about the task

Under discussion

Even after looking at the help section at others codes I am quite confused at this and how I should add all the numbers then divide by the total and print it out.

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.Scanner; public class Solution { public static void main(String[] args) throws Exception { Scanner scanner = new Scanner(System.in); while(true){ int number = scanner.nextInt(); int count = 0; if(number == -1) break; count++; int mean = number + number / count; System.out.println(mean); } } }

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matt

Level 24 , Springfield, United States

6 January 2020, 17:30

thank you for the reply, I feel like I have the math right now... but I don't know where to put the System.out.println without it being included in the loop. If I put it outside the loops it cannot find the variables.. my new code is below import java.util.Scanner; public class Solution { public static void main(String[] args) throws Exception { Scanner scanner = new Scanner(System.in); double count = 0; double mean = 0; while(true){ double number = scanner.nextInt(); if(number == -1) break; count++; mean += number; // mean = mean + number System.out.println(mean/ count); } } }

Shuy

Level 9 , Frankfurt, Germany

8 January 2020, 07:33

Since you initialized the variables before the while loop, you should be able to print them out outside of it. Maybe you went one } too far and went outside of the main?

Guadalupe Gagnon

Level 37 , Tampa, United States

6 January 2020, 16:51

useful

A few problems: - Having line 15 inside the loop means that every loop cycle 'count' will be set to 0. You will need to find a better location to have this line. - Line 20 doesn't make sense. Every loop cycle if this line is reached (meaning -1 was not entered), it just doubles the number and divides by count (which will be 1 because of the first point and line 19). -Line 22 is going to output the result of line 20, which will just be the entered number times 2. It will do this every loop cycle. You are going to need to fix the first point and then rethink the other 2 points. The program should sum up all the entered values and then divide by the amount of values. It should then output only 1 line which is the arithmetic mean.