Why I did not match the last requirement?

Question about the task

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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; import java.io.*; /* Arithmetic mean */ public class Solution { public static void main(String[] args) throws Exception { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); double result = 0.0f; int sum = 0; int i = 0; while(true) { String numbers = br.readLine(); int num = Integer.parseInt(numbers); if(num == -1) { break; } if(num != 0) { sum += num; i++; } } if(sum == 0) { result = 0.0; } else { result = (double)sum/(double)i; } System.out.print(result); } }

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niki4etoo

Level 8 , Ruse, Bulgaria

6 September 2018, 20:15

I figure it out. Thanks. It doesn't need to exclude the zero.

Roman

Level 41

6 September 2018, 06:10

solution

if(num != 0)

why?