(Homework Solution): 8. Grade Book A teacher has five students who have taken four tests. The teacher uses

The variables are well named and self explanatory. For indentation please find the attached screenshots.

package gradebook;

import java.io.*;
import java.util.*;

class Student{
String name;
Double[] testScores;
Double avgScore;
Character grade;

Student(String name){
this.name = name;
testScores = new Double[4];

}

public String getName(){
return name;
}

public Double getAvgScore(){
return avgScore;
}

public Character getGrade(){
return grade;
}

public void setScores(Double a,Double b,Double c,Double d){
testScores[0]=a;
testScores[1]=b;
testScores[2]=c;
testScores[3]=d;

avgScore = (a+b+c+d)/4;

if(avgScore<=59 && avgScore>=0){
grade = ‘F’;
}
else if(avgScore<=69){
grade = ‘D’;
}
else if(avgScore<=79){
grade = ‘C’;
}
else if(avgScore<=89){
grade = ‘B’;
}
else if(avgScore<=100){
grade = ‘A’;
}

}

}

class Batch{
ArrayList<Student> studentList;

Batch(){
studentList = new ArrayList<Student>();
}

public void addStudent(Student obj){
studentList.add(obj);
}

public void showRecords(){

for(Student obj:studentList){
System.out.println(obj.getName()+” “+obj.getAvgScore()+” “+obj.getGrade());
}
}
}

public class GradeBook {

public static void main(String[] args) throws IOException {
Batch A = new Batch();
Student obj;
String name;
Double score1,score2,score3,score4;
BufferedReader inp = new BufferedReader (new InputStreamReader(System.in));

for(int i=0;i<5;i++){
System.out.println(“Enter student name “+(i+1));
name = inp.readLine();
System.out.println(“Enter testScore 1”);
score1 = Double.parseDouble(inp.readLine());
while(score1<0 || score1>100){
System.out.println(“Invalid score”);
System.out.println(“Enter testScore 1 again”);
score1 = Double.parseDouble(inp.readLine());
}

System.out.println(“Enter testScore 2”);
score2 = Double.parseDouble(inp.readLine());
while(score2<0 || score2>100){
System.out.println(“Invalid score”);
System.out.println(“Enter testScore 2 again”);
score2 = Double.parseDouble(inp.readLine());
}

System.out.println(“Enter testScore 3”);
score3 = Double.parseDouble(inp.readLine());
while(score3<0 || score3>100){
System.out.println(“Invalid score”);
System.out.println(“Enter testScore 3 again”);
score3 = Double.parseDouble(inp.readLine());
}

System.out.println(“Enter testScore 4”);
score4 = Double.parseDouble(inp.readLine());
while(score4<0 || score4>100){
System.out.println(“Invalid score”);
System.out.println(“Enter testScore 4 again”);
score4 = Double.parseDouble(inp.readLine());
}

obj = new Student(name);
obj.setScores(score1, score2, score3, score4);
A.addStudent(obj);
}

A.showRecords();

}

}

Hope this helps, Please upvote if you feel satisfied.

Thank you 🙂