Thread: Need some help

I am working on a program that needs to allow a teacher to put in grades for an exam but I need it to ask for more then one student if the question of How many students? is greater then 1 then it needs to ask for the students first name, last name, and score,

Then it needs to calculate the score and give it a letter grade

This is my code so far

import javax.swing.JOptionPane;

public class Project
 
{
 
public static void main(String[] args)
 
{
 
double Score = 0;
 
char LetterGrade = 0;
 
String strMessage;
 
 
 
 
 
JOptionPane.showInputDialog("Please enter the total possible points for the test");
 
 
 
JOptionPane.showInputDialog("How many students do you have to enter");
 
 
 
JOptionPane.showInputDialog("Please enter students first name");
 
 
 
JOptionPane.showInputDialog("Please enter students last name");
 
 
 
JOptionPane.showInputDialog("Please enter students test score");
 
 
 
 
 
if(Score<=90)
 
LetterGrade='A';
 
else if (Score<=80)
 
LetterGrade='B';
 
else if (Score<=70)
 
LetterGrade='C';
 
else if (Score<=60)
 
LetterGrade='D';
 
else
 
LetterGrade='F';
 
 
 
strMessage=String.format("Your score of %.2f has earned you a letter grade of %c", Score,LetterGrade);
 
 
 
JOptionPane.showMessageDialog(null, strMessage);
 
 
 
}
 
 
 
}

Sounds like you need a loop that iterates one time for each student.

The assigning of letter grades code is in the wrong order. Most grades will be less the 90 and will get an A. Did you mean to test if the grade was greater than 90? Use > for greater

Please edit your post and wrap your code with code tags:

[code]
**YOUR CODE GOES HERE**
[/code]

to get highlighting and preserve formatting.

having problems with how to calculate the score

Please explain. What are you trying to do? Explain in some detail.
What does the program currently do now? Copy its output and paste it here.

The code is still testing for less than 90 (<) instead of greater than 90 (>)
A score of 22 would be less than 90 and therefore would get a letter grade of A


The posted code has lost all of its indentations which makes it harder to read an understand.
Please fix the indentations of the code.

The showInputDialog method returns a String that needs to be assigned to a variable so the program can use it:
String someVar = JOptionPane.showInputDialog(....

help me with writing the answers to a file

Look at using the PrintWriter class. It has many methods for printing characters to a file.

have it append every time the program

Use the FileWriter class's constructor with the boolean flag to indicate you want the new output to be appended.
To use FileWriter with PrintWriter, pass an instance of the FileWriter class to the PrintWriter class's constructor.
Something like:

  ... new PrintWriter(new FileWriter(new File("the filename here")), true);