create a java program that accepts students names, and test scores from a file, and displays theri name, average score and letter grade to the screen.
Please post also your question, for example, what you have done, where is your difficulty, or what kind of help you need.
class LastnameA6
{
static final NUMBEROFSTUDENTS = 5;
public static void main(String[] args)
{
//variable declaration
int test1, test2, test3, test4, test5; // variables to hold the values for the five test scores
double courseAvg = 0; // the average course score for each student
double classAvg = 0; // the average score for the whole class
String name; // variable to hold student name
char grade; // the grade scale 'A', 'B', 'C', 'D', 'F'
// add code here for the input(Assign7Input.txt) and output files (Assign7Output.txt)
......
// print the heading to the output text file.
System.out.println ("Student Test1 Test2 Test3 Test4 Test5 Average Grade");
for (int i = 0; i < NUMBEROFSTUDENTS; i++)
{
// add your code here to read the input and do the calculation
{ if
(grade <= 59)grade = F;
else
if (grade >= 60 && grade <=69)grade = D;
else
if (grade >=70 && grade <=79)grade = C;
else
if (grade >= 80 && grade <=89)grade = B;
else
if (grade >= 90 && grade <=100)grade = A;
// the following are from method call which to be completed later
courseAve = calculateAverage (test1, test2, test3, test4, test5);
grade = calculateGrade(courseAvg);
......
}
// add your code to calculate and output the class average
......
}
// Method 1: calculate the average grade from the five test scores
...... calculateAverage( ...... )
{
......
}
// Method 2: calculate the grade scale 'A', 'B', 'C', 'D', 'F'
......calculateGrade(......)
{
......
}
}
To create a Java program that accepts student names and test scores from a file and displays their name, average score, and letter grade to the screen, you need to follow these steps:
1. First, ensure that you have a file with the student names and test scores in a specific format. For example, you can use a CSV (Comma-Separated Values) file where each line represents a student's record, and the fields are separated by commas.
2. Read the file using the `java.util.Scanner` class. Open the file and read each line, one by one. Split the line using the comma delimiter to separate the student's name and test scores.
3. Create a class to represent a student, for example, named `Student`. This class should have fields to store the student's name, test scores, average score, and letter grade.
4. For each line read from the file, create a new `Student` object and initialize its fields with the corresponding values.
5. Calculate the average score for each student by adding up all the test scores and dividing by the total number of tests.
6. Determine the letter grade based on the average score. You can use a conditional statement (if-else or switch) to assign the appropriate letter grade.
7. Finally, display the student's name, average score, and letter grade to the screen using the `System.out.println()` method.
Here is an example Java program that implements the above steps:
```java
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class StudentGradeProgram {
public static void main(String[] args) {
try {
File file = new File("students.csv"); // replace with your file path/name
Scanner scanner = new Scanner(file);
while (scanner.hasNextLine()) {
String line = scanner.nextLine();
String[] data = line.split(",");
String name = data[0];
int[] scores = new int[data.length - 1];
for (int i = 1; i < data.length; i++) {
scores[i - 1] = Integer.parseInt(data[i]);
}
Student student = new Student(name, scores);
student.calculateAverageScore();
student.calculateLetterGrade();
student.displayStudentInfo();
}
scanner.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
class Student {
private String name;
private int[] scores;
private double averageScore;
private char letterGrade;
public Student(String name, int[] scores) {
this.name = name;
this.scores = scores;
}
public void calculateAverageScore() {
int sum = 0;
for (int score : scores) {
sum += score;
}
averageScore = (double) sum / scores.length;
}
public void calculateLetterGrade() {
if (averageScore >= 90) {
letterGrade = 'A';
} else if (averageScore >= 80) {
letterGrade = 'B';
} else if (averageScore >= 70) {
letterGrade = 'C';
} else if (averageScore >= 60) {
letterGrade = 'D';
} else {
letterGrade = 'F';
}
}
public void displayStudentInfo() {
System.out.println("Name: " + name);
System.out.println("Average Score: " + averageScore);
System.out.println("Letter Grade: " + letterGrade);
System.out.println();
}
}
```
Make sure to replace `"students.csv"` with the actual file path or name where you have your student records. Also, ensure that the format of the file matches the code's expectations.
Compile and run this program, and it will read the file, calculate the average scores and letter grades for each student, and display the information on the console.