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Question about the task

Arithmetic mean

Java Syntax, Level 5, Lesson 5

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mäh

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 scan = new Scanner(System.in); double durchschnitt = 0; double sum = 0; double counter = 1; double a = scan.nextDouble(); while (a!=-1){ sum = a + a; System.out.println(a); counter++; a = scan.nextInt(); if (a == -1){ durchschnitt = sum / counter; break; } System.out.println(durchschnitt); } } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

14 November 2019, 15:19

solution

You are close, here are some errors that I see: #1 line 19 is setting sum to a + a, this is not the behavior needed. What is needed is sum should be increased by a. #2 counter should be increased only when a valid number is entered. In this code it is increased every time even when the number entered is -1 #3 line 27 is inside the while loop and will be reached every loop cycle that the user (*this is also a hint for solving point #2**hint*hint) enters a valid number (a number that is not -1). You will want to move this line to outside the code block of the while loop. #4 Line 20 was probably added in for testing purposes. Make sure it is removed because it fails verification.