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MathTutor Program Help

Discussion in 'Java' started by Vanna Guo, Dec 3, 2010.

  1. Vanna Guo

    Vanna Guo New Member

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    I'm suppose to make a program that allows the user to choose addition, subtraction, multiplication, and division. They then get 10 questions. At the end of the questions the user gets a report on how well or bad they did.

    Now i'm stuck on these things:
    1) how to call ChooseOperation, DisplayQuestion, CheckAnswer, Display progress from main
    2) My do while loop in main is retarded. I cant figure how to do it right...
    3) System.println(correct[x-1]}); is wrong.. I want to print out a random array from correct[]

    I underlined all the errors that showed in netbeans.
    Thanks for the help!
    Code:
    public class MathTutor {
    
        Scanner input = new Scanner(System.in);
            String symbol;
            int operation;
            int answer;
            int correctCounter;
            int tryagain = 1;
    
    public static void main (String[] args){
        
        do {
    [u]ChooseOperation();[/u]
        
        for(int i = 1; i<10; i++){
            Random randomGenerator = new Random();
             int num1 = randomGenerator.nextInt(10);
             int num2 = randomGenerator.nextInt(10);
    
             [u]DisplayQuestion(num1, num2);[/u]
             [u]CheckAnswer(num1, num2);[/u]
        }
        
        [u]DisplayProgress();[/u]
             
             System.out.println("Enter the number 0 to quit, otherwise press any button to try again.");
            [u]tryagain = input.nextInt();[/u]
            
            if (tryagain == 0){
                System.out.println("Thank you for playing MathTutor");
                System.exit(1);
            }
            else
                System.out.println ("New session in progress..");
            
        [u]} while (tryagain != 0);[/u]
        }
            public int ChooseOperation (){
            
                System.out.println("Select an Operation.");
                System.out.println("1. Addition");
                System.out.println("2. Subtraction");
                System.out.println("3. Multiplication");
                System.out.println("4. Division");
                
                operation = input.nextInt();
    
     
                if (operation < 1 || operation > 4)
                {
                    System.out.println("You must enter an apporiate number.");
                }
            return operation;}
    
            
        public void DisplayQuestion(int num1, int num2) {
                
                int symbol = operation;
                
                switch(symbol)
                {
                    case 1: 
                        System.out.print("What is " + num1 + " + " + num2 + "? ");
                        break;
                    case 2: 
                        System.out.print("What is " + num1 + " - " + num2 + "? ");
                        break;
                    case 3: 
                        System.out.print("What is " + num1 + " * " + num2 + "? ");
                        break;
                    case 4: 
                        System.out.print("What is " + num1 + " / " + num2 + "? ");
                        break;
                    default: System.out.println("Error");
                        System.exit(1);
                        
                        answer = input.nextInt();
                               
                }}
                
                public void CheckAnswer(int num1, int num2){
                    String[] correct = {"Very good!","Excellent!","Nice work!","Keep up the good work!"};
                    String[] incorrect = {"No. Please try again.","Wrong. Try once more.","Don't give up!","No. Keep trying."};
                    
                    Random randomGenerator = new Random();
                    int x = randomGenerator.nextInt(4);
         
                    int symbol = operation;
                    switch(symbol)
                    {
                        case 1:
                            if (num1 + num2 == answer){
                            correctCounter++;
                            [u]System.println(correct[x-1]});[/u]
                            break;
                        case 2:
                            if (num1 - num2 == answer){
                            correctCounter++;
                            [u]System.println(correct[x-1]});[/u]
                            break;
                        case 3:
                            if (num1 * num2 == answer){
                            correctCounter++;
                            [u]System.println(correct[x-1]});[/u]
                            break;
                        case 4:
                             if (num1 / num2 == answer){
                             correctCounter++;
                             [u]System.println(correct[x-1]});[/u]
                             break;
                        default: [u]System.println(incorrect[x-1]});[/u]
                    
                        
            
        }
        
       
        public void DisplayProgress() {
            
            double percent = (correctCounter/10) * 10;
            if (percent < 75){
                System.out.println("Please ask your teacher for extra help with " + operation + ("because you earned ") + percent + "%");
            }
            else {
                System.out.println("You did a great Job! You earned " + percent + "%");
        }      
    }
    }
     
    Last edited by a moderator: Dec 3, 2010
  2. virxen

    virxen New Member

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    send your project in netbeans in a zip file here to help you
     
  3. Vanna Guo

    Vanna Guo New Member

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    Thanks but I figured it out, my a tutor helped me out. glad to know this forum is happy to help though :)
     

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