Chapter 4, Problem 7P

Creating the class “ExamStatistics.java”:

• Import required packages.
• Define the class “ExamStatistics”.
  • Define the “main ()” method.
    • Create an object for “Scanner” class.
    • Declare required variables.
    • Get the 1^st score from the user.
    • Do till the user entered score is greater than or equal to 0 using “while” condition.
      • Check if the value of score is lesser than “lowest”.
        • Assign “score” to “lowestScore”.
      • Check if the value of score is greater than “highest”.
        • Assign “score” to “highestScore”.
      • Check if the score is greater than or equal to 90.
        • Increment the value of “Acnt”.
      • Check if the score is greater than or equal to 80.
        • Increment the value of “Bcnt”.
      • Check if the score is greater than or equal to 70.
        • Increment the value of “Ccnt”.
      • Check if the score is greater than or equal to 60.
        • Increment the value of “Dcnt”.
      • Else
        • Increment the value of “Fcnt”.
      • Get the scores from the user.
    • Check if the value of “total_Count” is greater than 0.
      • Print all the grade count.
      • Calculate the percentages for all the grades.
      • Finally print the “lowestScore”, “highestScore”, “average”.

Program:

//Import required package

import java.util.*;

//Define the main class

public class ExamStatistics

{

    //Define the main method

    public static void main(String[] args)

    {

        //Create an object for scanner class

        Scanner sc = new Scanner(System.in);

        //Get the 1st score from the user

System.out.print("Please enter a score from 0 to 100 or -1 to quit: ");

        int score = sc.nextInt();

        //Declare required variables

int Acnt = 0,Bcnt = 0,Ccnt = 0,Dcnt = 0,Fcnt = 0,sumOfScores = 0,lowestScore = score,highestScore = score;

//Quit if negative value is entered

while(score >= 0)

        {

//Update running total of scores to get average

            sumOfScores = sumOfScores + score;

//Check if the value of score is less than lowest

            if(score < lowestScore)

                //Assign score to lowestScore

                lowestScore = score;

//Check if value of score is greater than highest

            else if(score > highestScore)

                //Assign score to highestScore

                highestScore = score;

//Check if the score is greater than or equal to 90

            if(score >= 90)

                //Increment the value of A grade

                Acnt = Acnt + 1;

//Check if the score is greater than or equal to 80

            else if(score >= 80)

                //Increment the value of B grade

                Bcnt = Bcnt + 1;

//Check if the score is greater than or equal to 70

            else if(score >= 70)

                //Increment the value of C grade

                Ccnt = Ccnt + 1;

//Check if the score is greater than or equal to 60

            else if(score >= 60)

                //Increment the value of D grade

                Dcnt = Dcnt + 1;

            //Else

            else

                //Increment the value of F grade

                Fcnt = Fcnt + 1;

            //Get the score from the user

System...