Modify Test Score App Math as described below.

1. Use the += operator to increase the scoreCount and scoreTotal variables. Then test this to makes sure it works.

2. As the user enters test scores, use the methods of the Math class to keep track of the minimum and maximum scores. When the user enter 999 to end the program, display these scores at the end of the other output data. Now, test these changes to make sure that they work.

3. Change the variable that you use to total the scores from a double to an int data type. Then use casting to cast the score count and score total to doubles as you calculate the average score and save that average as a double. Now, test that change.

4. Use the NumberFormat class to round the average score to one decimal place before displaying it at the end of the program. Then, test this change. Note that the rounding method that's used doesn't matter in a program like this.

// display operational messages

System.out.println("Please enter test scores that range from 0 to 100.");

System.out.println("To end the program enter 999.");

System.out.println(); // print a blank line

// initialize variables and create a Scanner object

double scoreTotal = 0;

int scoreCount = 0;

int testScore = 0;

Scanner sc = new Scanner(System.in);

// get a series of test scores from the user

while (testScore != 999)

{

// get the input from the user

System.out.print("Enter score: ");

testScore = sc.nextInt();

// accumulate score count and score total

if (testScore <= 100)

{

scoreCount = scoreCount + 1;

scoreTotal = scoreTotal + testScore;

}

else if (testScore != 999)

System.out.println("Invalid entry, not counted");

}

// display the score count, score total, and average score

double averageScore = scoreTotal / scoreCount;

String message = "\n" +

"Score count: " + scoreCount + "\n"

+ "Score total: " + scoreTotal + "\n"

+ "Average score: " + averageScore + "\n";

System.out.println(message);