I have an assignment for my beginners java course (which is an online course). I have to drill a student on 20 multiplication tables (random numbers 1-20) and then once all 20 questions are answered, I must give a grade.
I've been using my text (Intro to Java Programming), and looked through various sites on the web to try to better explain different ways to accomplish this. So far this is what I come up with. This code has been written from using the lessons in my text. The code compiles, but I get a number of errors. My biggest problem is that it does not cycle through 20 problems. It only goes through one. Thus the rest of the program doesnt execute, and I obviously cant get a grade. Some assistance and even explinations would be helpful! Thanks

import javax.swing.JOptionPane;

public class multDrill {
public static void main(String[] args) {

int count = 0; //count number problems
int score = 0; //begin count number right

while (count < 21){
//generate two random numbers
int number1 = (int)(Math.random(1) * 20);
int number2 = (int)(Math.random(1) * 20);
}
//give mult problem to student
String answerString = JOptionPane.showInputDialog
("What is" + number1 + " * " + number2 + " ? ");
int answer = Integer.parseInt(answerString);
//correct or incorrect
String replyString;
if (number1 * number2 == answer){
replyString = "Good Job";
score++;
}
else
replyString = "Incorrect";
JOptionPane.showMessageDialog(null, replyString);

//increase count by 1
count++;
}

{
if (score >= 18)
grade = 'A';
else if (score >= 16)
grade = 'B';
else if (score >= 14)
grade = 'C';
else if (score >= 12)
grade = 'D';
else
grade = 'F';
}
JOptionPane.showMessageDialog(null,
"Your grade is" + grade + );

}
}

First, If you post your code in the code tags, it makes it more readable and easier to help you find the errors.

Here is the code, the changes have been made and it works as you might want to have it:



I have commented the code, try to understand and ask if you have any doubts. Happy Coding! :)

EDIT: Beaten by 5 minutes

Few things I changed...

Initialized grade.
Removed bracket closing while loop after defining your two variables.
Changed some spacing.

Compiled and ran perfectly after that.




This post has been edited by Steven Smith: 17 Mar, 2008 - 06:10 PM

Both seem to work very well. Thank you very much to both of you. I'm going to play around with them just to get more familiar with the way that Java works. While online classes are so convenient, sometimes you lose out on that one on one instruction that is so very valuable.

Thank you again!!!!!!