Thread: Grading System Program

Ok so this is a grading program. I have it so the user can input 2 students and then at the end using an if statement it is suppose to compare them and print out who had the higher grade. Seems simple but it never runs the line of code to print out whos grade is higher:

if (stuAverage > stuAverage2 ){
		System.out.println(student + " has the highest grade of all students entered!");
	}
	else if (stuAverage2> stuAverage){
		System.out.println(student2 + " has the highest grade of all students entered!!");
	}

Here is the Main class:

import java.util.Scanner;
 
public class Main2 {
	int stuAverage;
	static String student;
 
	public static void main(String[] args) {
 
		Scanner input = new Scanner(System.in);
		Students stu2 = new Students();
		String grade;
		int[] answers;
		int[] correct;
		System.out.println("Enter student's name.");
		student = input.next();
		System.out.println();
		System.out.println("How many questions would you like to ask?");
 
		int num = input.nextInt(); // get the number of times to ask
		answers = new int[num]; // student's answers
		correct = new int[num]; // for teachers
		for (int x = 0; x < num; x++) {
			System.out.println("Enter the answer for question number: "
					+ (x + 1) + ".");
			correct[x] = input.nextInt();
		}
		System.out.println("Now for the students.");
		for (int x = 0; x < num; x++) {
			System.out.println("Enter the student answer.");
			answers[x] = input.nextInt();
		}
		int average = 0; // his/her grade
		for (int x = 0; x < num; x++){
			if (correct[x] == answers[x]){
				average++;
			}
 
		}
		average = (int) (((double) average) / ((double) num) * 100);
		if (average >= 90 && average <= 100)
			grade = "A";
		else if (average >= 80 && average <= 89)
			grade = "B";
		else if (average >= 70 && average <= 79)
			grade = "C";
		else if (average >= 60 && average <= 69)
			grade = "D";
		else
			grade = "F";
		int stuAverage;
		stuAverage = average;
		stu2.forMutipleStu();
 
	}
 
 
}

Here is the students class to run a second student

import java.util.Scanner;
 
 
public class Students extends Main2 {
public void forMutipleStu(){
 
	Scanner input = new Scanner(System.in);
	String grade2;
	int [] answers2;
	int[] correct2;
	String student2;
 
	System.out.println("Enter student's name.");
	student2 = input.next();
	System.out.println("A=1, B=2, C=3, D=4");
	System.out.println("How many questions would you like to ask?");
 
	int num2 = input.nextInt(); // get the number of times to ask
	answers2 = new int[num2]; // student's answers
	correct2 = new int[num2]; // for teachers
	for (int x = 0; x < num2; x++){
		System.out.println("Enter the answer for question number: " + (x+1) + ".");
		correct2 [x] = input.nextInt();
	}
	System.out.println("Now for the students.");
	for (int x = 0; x < num2; x++){
		System.out.println("Enter the student answer.");
		answers2[x] = input.nextInt();
	}
	int average2 = 0; // his/her grade
	for (int x = 0; x < num2; x++){
		if (correct2[x] == answers2[x]){
			average2++;	
		}
 
	}
	average2 = (int) (((double)average2)/ ((double)num2) * 100);
	if (average2 >= 90 && average2 <= 100)
		grade2 = "A";
	else if (average2 >= 80 && average2 <= 89)
		grade2 = "B";
	else if (average2 >= 70 && average2 <= 79)
		grade2 = "C";
	else if (average2 >= 60 && average2 <= 69)
		grade2 = "D";
	else 
		grade2 = "F";
	int stuAverage2;
	stuAverage2 = average2;
 
 
 
	if (stuAverage > stuAverage2 ){
		System.out.println(student + " has the highest grade of all students entered!");
	}
	else if (stuAverage2> stuAverage){
		System.out.println(student2 + " has the highest grade of all students entered!!");
	}
	}
 
}

Thanks!

Lol. Its not finished I was just stuck on this one part. So thanks for the feedback but just bashing my design doesn't help me. Tell me how I could make it better.

Thanks

A little back ground on me.... Im 15 and just started learning java over the summer 4 months ago. Thanks for the advice.

Hello, I am trying to figure out how each time I run the program, in the loop it runs and ask the user for the student name to connect with the students score. But if each time the loop ran the previous students name would be overwritten. How do I use an array to after each run in the loop store a students name and create a new one each time it runs?
Thanks, here is the code but I'm just showing you what I have. It is not finished, or close.

import java.util.Scanner;
 
 
public class Students extends Main2 {
public void forMutipleStu(){
 
	Scanner input = new Scanner(System.in);
	String grade2;
	int [] answers2;
	int[] correct2;
	String student2;
 
	System.out.println("Enter student's name.");
	student2 = input.next();
	System.out.println("A=1, B=2, C=3, D=4");
	System.out.println("How many questions would you like to ask?");
 
	int num2 = input.nextInt(); // get the number of times to ask
	answers2 = new int[num2]; // student's answers
	correct2 = new int[num2]; // for teachers
	for (int x = 0; x < num2; x++){
		System.out.println("Enter the answer for question number: " + (x+1) + ".");
		correct2 [x] = input.nextInt();
	}
	System.out.println("Now for the students.");
	for (int x = 0; x < num2; x++){
		System.out.println("Enter the student answer.");
		answers2[x] = input.nextInt();
	}
	int average2 = 0; // his/her grade
	for (int x = 0; x < num2; x++){
		if (correct2[x] == answers2[x]){
			average2++;	
		}
 
	}
	average2 = (int) (((double)average2)/ ((double)num2) * 100);
	if (average2 >= 90 && average2 <= 100)
		grade2 = "A";
	else if (average2 >= 80 && average2 <= 89)
		grade2 = "B";
	else if (average2 >= 70 && average2 <= 79)
		grade2 = "C";
	else if (average2 >= 60 && average2 <= 69)
		grade2 = "D";
	else 
		grade2 = "F";
	int stuAverage2;
	stuAverage2 = average2;
 
 
	System.out.println(stuAverage);
	System.out.println(stuAverage2);
	if (stuAverage > stuAverage2 ){
		System.out.println(student + " has the highest grade of all students entered!");
	}
	else if (stuAverage2> stuAverage){
		System.out.println(student2 + " has the highest grade of all students entered!");
	}
	else if (stuAverage2 == stuAverage){
		System.out.println(student + " and " + student2 + " both have the same average!" );
	}
	}
 
}

I merged your new topic with your previous, because it's the same problem, and you're trying to sidestep Junky's advice. Being 15 is not an excuse or a disease or a syndrome that allows us to give you bad advice.

How do I use an array to after each run in the loop store a students name and create a new one each time it runs?

You don't. Create a Student class with the attributes needed to store the details of each Student, and create a Student object for each student, each with its own details. Store the Student objects in an array or an ArrayList<Student> object.

Your current design in which class Students extends Main2 is nonsense on many levels. It's not an approach that's teaching you anything but bad habits and poor design. Your code and this most recent question indicate that you've jumped ahead or skipped around in whatever material you're using to study Java without establishing a good understanding of the foundational material. Take a step back and learn the basics.

Originally Posted by GregBrannon

Create a Student class with the attributes needed to store the details of each Student, and create a Student object for each student, each with its own details. Store the Student objects in an array or an ArrayList<Student> object.

Thanks for the answer, but I'm not sure what you are saying. Could you explain a little more?
thanks