Write an application named DailyTemps that continuously prompts a user for a series of daily high temperatures until the user enters a sentinel value of 999. Valid temperatures range from - 20 through 130 Fahrenheit. When the user enters a valid temperature, add it to a total; when the user enters an invalid temperature, display the error message:

import java. util. Scanner;

public class DailyTemps

{

public static void main (String[] args) {

int total = 0, count = 0;

double avg = 0;

Scanner input = new Scanner (System. in);

System. out. print ("Enter a temprature: ");

double temperature = input. nextDouble ();

while (temperature! = 999) {

if (temperature > = - 20 && temperature < = 130) {

total + = temperature;

count + +;

}

else

System. out. println ("Invalid Input!");

System. out. print ("Enter a temprature: ");

temperature = input. nextDouble ();

}

avg = total / (double) count;

System. out. printf ("The average of " + count + " temperature is: %.2f", avg);

}

}

Explanation:

- Initialize the variables

- Ask the user for the temperature

- Initialize the while loop that iterates until the user enters 999

- Check temperature if it is between - 20 and 130, if yes, add it to the total and increment the count by 1. If it is not between the interval, print an error message

- Keep asking the temperature

- Calculate and print the average of the temperatures