Arithmetic mean

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The arithmetic mean is a value that is often used in statistics. A hospital's average temperature is precisely calculated using the formula for the arithmetic mean. And now we've come to the critical part: write a program that takes numbers from the keyboard, sums them, and then calculates the mean until the user enters the number -1.

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ajinkya bharate

Level 8 , Pune, India

25 May 2021, 11:01

make sum variable a double

KARMA GURUNG

Level 5 , Wyken, United Kingdom

21 February 2021, 12:45

hint: use while loop, check the entered no. with (if). if it is -1 then, display the mean otherwise keep on adding double is the key

Sinisa

Level 11 , Banja Luka, Bosnia and Herzegovina

20 February 2021, 10:44

This task's description is either not properly described, or the proposed solution is flawed. The solution provided by the CodeGym expects user to eventually input -1. In the task's description, it is an condition, not an obligation. Hence, if the user doesn't input -1, the program returns an error, ie., never finishes. So, either change the requirements and say, not IF the user enters -1 but WHEN, or state the number of user inputs, so that the program can return an output in case the user doesn't enter -1.

Jac

Level 7 , Birmingham, United States

22 September 2020, 01:46

I'm getting NaN as an output. Any help?

package com.codegym.task.task05.task0507;

/*
Arithmetic mean

*/
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Solution {
    public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        double sumNum = 0.0;
        double count = 0.0;
        double meanNum = sumNum / count;

        while(true){
            int number = Integer.parseInt(reader.readLine());
            if(number == -1){
                System.out.println(meanNum);
                break;
            } else {
                sumNum += (number + 0.0);
                count++;
            }
        }


    }
}

Toni Fields

Level 12 , Jacksonville, United States

24 January 2021, 02:59

Not sure if you figured this one out yet, but you should move your meanNum initialization to after your while loop. In your while loop, remove the print statement. This statement should come after the while loop and after you declare the meanNum variable. Everything else is fine.

ImDevin

Level 15 , Old Town, United States

5 April 2021, 14:51

Nan is what you get when you divide 0.0 by 0.0, as it is in line 20. Prior to line 20, there is no increase in neither of the numbers, so you have to fix the order of operations first.

Erin Armstrong

Level 9

8 February 2020, 19:30

ok i got the solution to the arithmetic one but i literally don't understand why. basically i was getting 2.16777777777 then i added {} after my if and closed it from my break and it worked.......

ъуъ

Level 9 , Vilnius, Lithuania

25 September 2020, 10:46

Cristea Ovidiu-Valentin

Level 22 , Sibiu, Romania

19 November 2019, 22:35

"Casting" is used to get a double from an integer division : 1. double d = (double)5 / 20; 2. double v = (double)5 / (double) 20; 3. double v = 5 / (double) 20; or implicit casting : double d = num * 1.0 / denom; Just learned that and it is useful ,.

Firdous Shaikh

Level 5 , Mumbai, India

6 November 2019, 07:26

com/codegym/task/task05/task0507/Solution.java:11: error: cannot find symbol Scanner s = new Scanner(System.in); ^ symbol: class Scanner Why am i getting this error location: class com.codegym.task.task05.task0507.Solution