Homework SourseCreate a Java application with generated comments to simulat
Create a Java application (with generated comments) to simulate a “GradeBook”. A teacher has five students who have taken four exams. The teacher uses the following grading scale to assign a letter grade to a student, based on the average of his or her four exam scores:
Average
Letter Grade
90 – 100
A
80 – 89
B
70 – 79
C
60 – 60
D
0 – 59
F
Write logic to create a String array to hold student names, a character array to hold student letter grades, and a two-dimensional array to hold each of the five students’ test scores for each of the four exams completed during the semester.
Use nested for loop logic to fill the names and test scores arrays. Do not accept test scores less than zero or greater than 100. Make sure you test both ends of the range!
Use another nested for loop to compute the average test score for each student and then assign the corresponding letter the letter grade array. Make sure you test each letter grade value!
Use while loop logic to display each student’s name and letter grade in tabular fashion.
| Average | Letter Grade |
| 90 – 100 | A |
| 80 – 89 | B |
| 70 – 79 | C |
| 60 – 60 | D |
| 0 – 59 | F |
Solution
Code
import java.util.Scanner;
public class StudentGrades {
public static void main(String[] args) {
String[] students = new String[5];
char[] grades = new char[5];
int[][] marks = new int[5][4];
Scanner in = new Scanner(System.in);
for (int i = 0; i < 5; i++) {
// to take student name from user
System.out.println(\"Enter student name\");
students[i] = in.next();
int sum = 0;
// for loop to take input for marks for each student
for (int j = 0; j < 4; j++) {
System.out.println(\"Enter marks for \" + students[i] + \" for test\" + (j + 1));
marks[i][j] = in.nextInt();
// while loop to to take only valid input
while (marks[i][j] < 0 || marks[i][j] > 100) {
System.out.println(\"Invalid marks! marks should be >=0 and <=100\");
marks[i][j] = in.nextInt();
}
// to sum all marks
sum += marks[i][j];
}
// to calculate average marks
int avg = sum / 4;
// System.out.println(\"Average score is \" + avg);
// grading based on marks
if (avg >= 90)
grades[i] = \'A\';
else if (avg >= 80)
grades[i] = \'B\';
else if (avg >= 70)
grades[i] = \'C\';
else if (avg >= 60)
grades[i] = \'D\';
else
grades[i] = \'E\';
}
// to print student name and respective grade
System.out.println(\"Student Name\\tgrades\");
for (int i = 0; i < 5; i++)
System.out.println(students[i] + \"\\t\\t\\t\" + grades[i]);
}
}
Sample output
Enter student name
akhila
Enter marks for akhila for test1
100
Enter marks for akhila for test2
98
Enter marks for akhila for test3
95
Enter marks for akhila for test4
96
Enter student name
anusha
Enter marks for anusha for test1
34
Enter marks for anusha for test2
59
Enter marks for anusha for test3
98
Enter marks for anusha for test4
87
Enter student name
kalyani
Enter marks for kalyani for test1
70
Enter marks for kalyani for test2
69
Enter marks for kalyani for test3
89
Enter marks for kalyani for test4
93
Enter student name
sindhu
Enter marks for sindhu for test1
12
Enter marks for sindhu for test2
93
Enter marks for sindhu for test3
23423
Invalid marks! marks should be >=0 and <=100
234
Invalid marks! marks should be >=0 and <=100
120
Invalid marks! marks should be >=0 and <=100
98
Enter marks for sindhu for test4
65
Enter student name
smruthi
Enter marks for smruthi for test1
56
Enter marks for smruthi for test2
86
Enter marks for smruthi for test3
98
Enter marks for smruthi for test4
56
Student Name grades
akhila A
anusha D
kalyani B
sindhu D
smruthi C
