Step 4: Add code that discards any extra entries at the propmt that asks if you

Question

Step 4: Add code that discards any extra entries at the propmt that asks if you want to enter another score.

Notes from professor:

For Step 4, add a loop that will validate the response for the prompt question:

      "Enter another test score? (y/n): "

This loop must only accept the single letters of ‘y’ or ‘n’ (upper case is okay). I suggest that you put this loop inside the loop that already determines if the program should collect more input, after the code that calculates the average.

Here is what I have so far:

import java.util.Scanner;
import java.text.NumberFormat;

public class TestScoreApp
{
public static int getIntWithinRange(Scanner sc, String prompt,
int min, int max)
{
int i = 0;
boolean isValid = false;
while (isValid == false)
{
i = getInt(sc, prompt);
if (i <= min)
System.out.println(
"Error! Number must be greater than " + min + ".");
else if (i >= max)
System.out.println(
"Error! Number must be less than " + max + ".");
else
isValid = true;
}
return i;
}
  
public static int getInt(Scanner sc, String prompt)
{
int i = 0;
boolean isValid = false;
while (isValid == false)
{
System.out.print(prompt);
if (sc.hasNextInt())
{
i = sc.nextInt();
isValid = true;
}
else
{
System.out.println("Error! Invalid integer value. Try again.");
}
sc.nextLine(); // discard any other data entered on the line
}
return i;
}
public static void main(String[] args)
{
int scoreTotal = 0;
int scoreCount = 0;
int testScore = 0;
double averageScore = 0;

Scanner sc = new Scanner(System.in);
String choice = "y";
while (!choice.equalsIgnoreCase("n"))
{
// get the input from the user
System.out.print("Enter score: ");
testScore = sc.nextInt();
  
testScore = getIntWithinRange(sc,"Enter score: ",1,100);
scoreCount += 1;
scoreTotal += testScore;
averageScore = (double) scoreTotal / (double) scoreCount;

// see if the user wants to enter more test scores
System.out.print("Enter another test score? (y/n): ");
choice = sc.next();
  
}

NumberFormat number = NumberFormat.getNumberInstance();
number.setMaximumFractionDigits(1);
String message = " " +
"Score count: " + scoreCount + " "
+ "Score total: " + scoreTotal + " "
+ "Average score: " + number.format(averageScore) + " ";
System.out.println(message);
}
  

}

Explanation / Answer

import java.util.Scanner;
import java.text.NumberFormat;

public class TestScoreApp
{
     public static int getIntWithinRange(Scanner sc, String prompt,
    int min, int max)
    {
        int i = 0;
        boolean isValid = false;
        while (isValid == false)
        {
            i = getInt(sc, prompt);
            if (i <= min)
                System.out.println(
                    "Error! Number must be greater than " + min + ".");
            else if (i >= max)
                System.out.println(
                    "Error! Number must be less than " + max + ".");
            else
                isValid = true;
        }
        return i;
    }
  
    public static int getInt(Scanner sc, String prompt)
    {
        int i = 0;
        boolean isValid = false;
        while (isValid == false)
        {
            System.out.print(prompt);
            if (sc.hasNextInt())
            {
                i = sc.nextInt();
                isValid = true;
            }
            else
            {
                System.out.println("Error! Invalid integer value. Try again.");
            }
            sc.nextLine(); // discard any other data entered on the line
        }
        return i;
    }
    public static void main(String[] args)
    {
        int scoreTotal = 0;
        int scoreCount = 0;
        int testScore = 0;
        double averageScore = 0;

        Scanner sc = new Scanner(System.in);
        String choice = "y";
        while (!choice.equalsIgnoreCase("n"))
        {
            // get the input from the user
            System.out.print("Enter score: ");
            testScore = sc.nextInt();
          
            testScore = getIntWithinRange(sc,"Enter score: ",1,100);
            scoreCount += 1;
            scoreTotal += testScore;
            averageScore = (double) scoreTotal / (double) scoreCount;
       
             // see if the user wants to enter more test scores
            System.out.print("Enter another test score? (y/n): ");
            choice = sc.next();
          
            // Check if the anwer choice is neither equal to y nor n.
            while(!choice.equalsIgnoreCase("n") && !choice.equalsIgnoreCase("y")){
                System.out.print("Invalid input, please enter (y/n)? : ");
                choice = sc.next();
            }
        }

        NumberFormat number = NumberFormat.getNumberInstance();
        number.setMaximumFractionDigits(1);
        String message = " " +
                         "Score count:   " + scoreCount + " "
                       + "Score total:   " + scoreTotal + " "
                       + "Average score: " + number.format(averageScore) + " ";
        System.out.println(message);
    }
  

}

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