My Variable Values are Supposedly correct but I can't get the right answer.

Question about the task

Arithmetic mean

Java Syntax, Level 5, Lesson 5

Under discussion

When I enter 1,2,2,4,5, -1, it doesn't work. It gives me 2.0 instead of 2.8 for some reason :(

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.io.*; public class Solution { public static void main(String[] args) throws Exception { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); int input = 0; int log = 0; int count = 0; while (input != -1) { input = Integer.parseInt(reader.readLine()); if (input != -1) { log += input; count++; } else if (input == -1) { double result = (double)(log / count); System.out.println(result); break; } } } }

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Corto

Level 15 , Dublin, Ireland

15 August 2019, 20:28

Consider this code while(n!=-1){ String temp = reader.readLine(); n = Integer.parseInt(temp); //input of n number! If is not -1 // proceed down with operation. ................................................ if(n==-1){ // input of -1 . STOP operation break; // while operation is done! } go out from while and print(mean). ..................................... count+=1; // in n is not -1 continue, for every n add 1 sum = sum + n; // sum is previous sum + new n mean= sum / count; //mean is sum/count } System.out.println(mean); // this will print mean before n==-1 because for Java when n was -1 operation // is shut and it will exit operation. But in this case n WILL BE NOT ADDED to // sum so value of mean is everything what happened before n ==-1 BUT if you have this code while(n!=-1){ String temp = reader.readLine(); n = Integer.parseInt(temp); count+=1; sum = sum + n; mean= sum / count; if(n==-1){ break; } } System.out.println(mean); In this case Java will take first n==-1 in sum and mean and then terminate while loop.

Randall John Software Developer at Servicenow

17 August 2019, 16:38

I'm still getting the same error :( It's due to rounding apparently.