Hello fellow programers...I hope someone can help me. I'm new to java and I have an assignment for extra credit that I could really use. This is my first programing course and this problem has me a bit out of my league.

Anyway the assignment is "Create math drill program that asks category (+,-,/,*), gives 10 random questions, keeps score, time elapsed, and then asks if you want to do it again. 20 points. For an extra 5 points, include modulus."

So far, this is my code...

I hope someone can not only show me the errors I have made but also give me some pointers.import javax.swing.JOptionPane; public class MathDrillLoop {//start program public static void main (String[] args) {//start main //Create start time long startTime = System.currentTimeMillis(); //declare string output String output = ""; //declare Number of questions final int NUMBER_OF_QUESTIONS = 10; int score = 0; for (int count = 0; count < 10; count++) { JOptionPane.showMessageDialog(null,"Correct count is " + count); //declare integers int number1, number2, answer, temp; } //declare strings String str1, str2, answerString, replyString; do{ //Ask user to choose problem type String entercodeString = JOptionPane.showInputDialog( "Choose 1 for addition, 2 for subtraction, 3 for multiplication, 4 for division, or 5 for modulo "); while (! entercode = ("1")&& entercodeString!= ("2") && entercodeString != ("3") && entercodeString != ("4") && entercodeString != ("5")); { output = "Invalid problem type, Try again "; JOptionPane.showMessageDialog(null,output); int opcode = Integer.parseInt(entercodeString); //Switch statements switch (opcode) { //if addition enter first number case (1) : str1 = JOptionPane.showInputDialog( "Enter integer value, for example 5:"); number1 = Integer.parseInt(str1); //Enter second number str2 = JOptionPane.showInputDialog( "Enter integer value, for example 7:"); number2 = Integer.parseInt(str2); answerString = JOptionPane.showInputDialog ("What is " + number1 + " + " + number2 + " ? "); answer = Integer.parseInt(answerString); if (number1 + number2 == answer){ replyString = "Good Job"; score++; } else replyString = "Incorrect"; JOptionPane.showMessageDialog(null, replyString); //increase count by 1 count++; break; //if subtaction enter first number case (2) : str1 = JOptionPane.showInputDialog( "Enter integer value, for example 5:"); number1 = Integer.parseInt(str1); //Enter second number str2 = JOptionPane.showInputDialog( "Enter integer value, for example 7:"); number2 = Integer.parseInt(str2); if (number1 < number2) { temp = number1; number1 = number2; number2 = temp; } answerString = JOptionPane.showInputDialog ("What is " + number1 + " - " + number2 + " ? "); answer = Integer.parseInt(answerString); if (number1 - number2 == answer){ replyString = "Good Job"; score++; } else replyString = "Incorrect"; JOptionPane.showMessageDialog(null, replyString); //increase count by 1 count++; break; // if multiplication enter first number case (3) : str1 = JOptionPane.showInputDialog( "Enter integer value, for example 5:"); number1 = Integer.parseInt(str1); //Enter second number str2 = JOptionPane.showInputDialog( "Enter integer value, for example 7:"); number2 = Integer.parseInt(str2); answerString = JOptionPane.showInputDialog ("What is " + number1 + " * " + number2 + " ? "); answer = Integer.parseInt(answerString); if (number1 * number2 == answer){ replyString = "Good Job"; score++; } else replyString = "Incorrect"; JOptionPane.showMessageDialog(null, replyString); //increase count by 1 count++; break; //if division enter first number case (4) : str1 = JOptionPane.showInputDialog( "Enter integer value, for example 5:"); number1 = Integer.parseInt(str1); //Enter second number str2 = JOptionPane.showInputDialog( "Enter integer value, for example 7:"); number2 = Integer.parseInt(str2); answerString = JOptionPane.showInputDialog ("What is " + number1 + " / " + number2 + " ? "); answer = Integer.parseInt(answerString); if (number1 / number2 == answer){ replyString = "Good Job"; score++; } else replyString = "Incorrect"; JOptionPane.showMessageDialog(null, replyString); //increase count by 1 count++; break; //if modulo enter first number case (5) : str1 = JOptionPane.showInputDialog( "Enter integer value, for example 5:"); number1 = Integer.parseInt(str1); //Enter second number str2 = JOptionPane.showInputDialog( "Enter integer value, for example 7:"); number2 = Integer.parseInt(str2); answerString = JOptionPane.showInputDialog ("What is " + number1 + " % " + number2 + " ? "); answer = Integer.parseInt(answerString); if (number1 % number2 == answer){ replyString = "Good Job"; score++; } else replyString = "Incorrect"; JOptionPane.showMessageDialog(null, replyString); //increase count by 1 count++; break; default : output = "Invalid problem type, Try again "; JOptionPane.showMessageDialog(null,output); System.exit(0); } long endTime = System.currentTimeMillis(); long testTime = endTime - startTime; output = ("Correct count is " + count + "\nTest time is " + testTime / 1000 + " seconds\n" + output); input = JOptionPane.showInputDialog(null, "Do you want to take the quiz again?", "yes or no"); if(input == "yes") return; if(input == "no"); System.exit(0); } }

I bow down to your expertise.

Neil