The number format in one decimal place to make this to round the average score to one decimal in this program.

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import java.util.Scanner;

public class TestScoreApp
{
public static void main(String[] args)
{
// 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 <= 100)
{
// 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;
}
}

// 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);
}
}