Code Help!

User 10694570

I cannot figure out what I am doing wrong. I just don't feel like I'm ever going to understand all of this. My prompts and loop are working fine. However, I am not getting any output. I'm sure it's a fairly simple thing, but I just don't see it so I can't know for sure what I need to fix. I have watched all the videos and looked through my textbook and the internet, but I need someone to "dumb" it down for me, I guess. Thank you, in advance, for your patience and help.

import java.util.Scanner;

public class StudentInfoTest
{
public static void main(String[] args)
{
//Initiate scanner.
Scanner input = new Scanner(System.in);

	//Declare Variables.
	String answer = "";
	double GPA = 0.0;
	
	//Create Object		
	StudentInfo info = new StudentInfo(null, 0, 0);
	
	//Prompt for and store student name.
	System.out.print("Enter student name: ");
	String name = input.nextLine();
	info.setName(name); 

	//Prompt for class credits and letter grade.
	//Loop until answer is "N".
	do 
	{
	System.out.print("Enter class credits: ");
	String credits = input.nextLine();
	
	System.out.print("Enter letter grade: ");
	String grade = input.nextLine();

	System.out.print("Add another class? (Y or N): ");
	
	answer = input.nextLine();
	}
	while (answer.equals("Y"));
	
	System.out.printf(name + ", Your GPA is %.2f/n.", GPA);
	
}//Ends Main

}//Ends Class

public class StudentInfo {

    //Variables
    private String studentName;
    private double totalPoints;
    private double totalCredits;

    //Constructor
    public StudentInfo(String name, double points, double credits)
    {
        //Initialize Variables
        studentName = name;
        totalPoints = points;
        totalCredits = credits;
    }

    //Create "Set" Functions
    public void setName(String name)
    {
        studentName = name;
    }

    //Create "Get" Functions
    public String getName()
    {
        return studentName;
    }

        public void addClass(double credits, String grade)
        {
            double points = 0.0;

            if(grade == "A" | grade == "a")
                points = 4.0;
            if(grade == "B" | grade == "b")
                points = 3.0;
            if(grade == "C" | grade == "c&quo

Wendelius

If I understand your question correctly, you never get the correct GPA? If that is the case, it looks like you never call getGPA, you only use the initial (0.0) value. So instead of

System.out.printf(name + ", Your GPA is %.2f/n.", GPA);

Should you have

System.out.printf(name + ", Your GPA is %.2f/n.", info.getGPA());

The same applies to credits and grade. You never seem to call addClass

User 10694570

I guess I don't understand what I am supposed to do to call them...

Wendelius

Have a look at the example I wrote. The same way, after you have got the input from the user call the addClass method with your variables... Something like

info.addClass(credits, grade);

Just keep in mind that the next thing you should implement is proper conversion between the data types (from string to double)

User 10694570

I really appreciate your help... Apparently, I'm EXTREMELY dumb with this. So you mean... That I have:

System.out.print("Enter class credits: ");
String credits = input.nextLine();

And I need to change it to:

System.out.print("Enter class credits: ");
double credits = input.nextDouble();

Where would I put the:

info.addClass(credits, grade);

When I added it after the grade code, it messed up my prompts.

Lost User

If you really don't understand then you should go back and work through your course notes. You can also find some excellent learning materials at http://download.oracle.com/javase/tutorial/index.html[^].