I'd appreciate it if someone could help. I think I've done everything else right it's just that I'm stuck in an infinite loop.

Question about the task

Under discussion

package com.codegym.task.task05.task0507;

/*
Arithmetic mean

*/
import java.io.*;
public class Solution {
    public static void main(String[] args) throws Exception {
        //write your code here
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        int num = Integer.parseInt(reader.readLine());
        int counter = 0;
        int total = 0;
        int mean;
        while(num != -1){
            counter++;
            total = total + num;

            if(num == -1){
                total = total + 1;
                mean = total / counter;
                System.out.println(mean);
                break;
            }
        }

    }
}

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 { //write your code here BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); int num = Integer.parseInt(reader.readLine()); int counter = 0; int total = 0; int mean; while(num != -1){ counter++; total = total + num; if(num == -1){ total = total + 1; mean = total / counter; System.out.println(mean); break; } } } }

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Thomas

Level 41 , Bayreuth, Germany

26 June 2022, 13:33

num does not change inside the while loop. It always will have the value of your first (and only) input in line 12. If that value is != -1 then the loop will run endlessly. You probably want to have the user input inside the loop?

int num = 0;
// ... other code
while (num != -1) {
     num = Integer.parseInt(reader.readLine());
...

or similar, just in one line:

int num = 0;
while ((num = Integer.parseInt(reader.readLine())) != -1) {
...

or as for loop

for (int input = 0; (input = Integer.parseInt(reader.readLine())) != -1; ) {
...