Can someone help me figure out to write this while loop?

Question

I am really struggling to understand how to write this while loop based on the instructions. Can someone please show me what to do? I already tried to write my own code below and it's bad.

Here are the instructions:

Write a sentinel controlled while loop that will allow you to calculate the average low temperature for any month. The average temperature should be displayed as a properly calculated double value. Explain why you chose the sentinel value. The code for the input of the initial temperature value is provided.

Here is my code:

Scanner scan = new Scanner(System.in);
int temp = scan.nextInt();

while ()
{
    temp = 5.0/9.0 * (temp - 32.0);
    System.out.println()
}

Answer 1

The sentinel is any non-numeric string:

public class Sentinel {

    public static void main(String args []) {
        Scanner scan = new Scanner(System.in);
        String temp = scan.next();
        int count = 0;
        double total = 0;
        while (isNumeric(temp))
        {
            total += Double.parseDouble(temp);
            count++;
            temp = scan.next();
        }
        System.out.println(BigDecimal.valueOf(total/count).setScale(3, RoundingMode.HALF_UP).doubleValue());
    }

    public static boolean isNumeric(String str) {
        return str.matches("-?\\d+(\\.\\d+)?");  //match a number with optional '-' and decimal.
    }
}

Your original code is also trying to convert from fahrenheit to celsius even though the problem statement doesn't say anything about the scale.

Answer 2

int n = scan.nextInt();           //to input number of days in a given month
int[] temp = new int[n];          //an array to store the low temps of all days
int i=0, total=0;
double avg=0.0;
while (i<n)
{   
    temp[i] = scan.nextInt();     //input temperature per day one at a time
    total=total+temp[i];          //to get the sum total of all days of the month
    i++                           //increment the counter i
}
avg=total/n;
System.out.println("the average low temperature is :"+avg);```