Question

public class calculator {
static char operator;
static String operatorWord;
static String nameOfFirstNumber;
static String nameOfSecondNumber;
static double firstNumber;
static double secondNumber;
static int response2;

public static void setResponse2(boolean b){
    if(b = true){
        response2 = JOptionPane.YES_OPTION;
    }
    else if(b = false){
        response2 = JOptionPane.NO_OPTION;
    }
    else;
}

public static void setOperator(char c){
    operator = c;
}

public static void setOperatorWord(String s) throws NotAnOperatorException{
    operatorWord = s;
}


public static String getOperatorWord(char c, int i) throws NotAnOperatorException{
    if(c == '*'){
        return "Multiplication";
    }
    else if(c == '/'){
        return "Division";
    }
    else if(c =='+'){
        return "Addition";
    }
    else if(c == '-'){
        return "Subtraction";
    }
    else if(c == '%'){
        return "Remainder";
    }
    if(i < 2){
        throw new NotAnOperatorException();
    }
    return null;
}

public static void defineNameOfNumbers(char c){
    if(c == '*'){
        nameOfFirstNumber = "multiplicand";
        nameOfSecondNumber = "multiplier";
    }
    else if(c == '/'||c == '%'){
        nameOfFirstNumber = "dividend";
        nameOfSecondNumber = "divisor";
    }
    else if(c == '+'){
        nameOfFirstNumber = "addend";
        nameOfSecondNumber = "addend";
    }
    else if(c == '-'){
        nameOfFirstNumber = "subtrahend";
        nameOfSecondNumber = "minuend";
    }
}

public static double getRemainder(){
    if(operator == '/'||operator == '%'){
        return firstNumber%secondNumber;
    }
    else{
        return (Double) null;
    }
}

public static double getAnswer(){
    if(operator == '*'){
        return firstNumber*secondNumber;
    }
    else if(operator == '/'){
        return firstNumber/secondNumber;
    }
    else if(operator == '%'){
        return firstNumber%secondNumber;
    }
    else if(operator == '+'){
        return firstNumber+secondNumber;
    }
    else if(operator == '-'){
        return firstNumber-secondNumber;
    }
    else{
        return (Double) null;
    }
}

public static String getRemainderString(){
    //get the remainder & string...//
    if(operator == '/'){
        int answer = (int) (firstNumber/secondNumber);
        int remainder = (int) (firstNumber%secondNumber);
        return "\n"+answer+" remainder "+remainder;
    }
    else{
        return "";
    }
}



/**
 * @param args
 * @throws NotAnOperatorException 
 * @throws HeadlessException 
 */
public static void main(String[] args) throws HeadlessException, NotAnOperatorException {
    //end of catch statements//
    do{

        //get the operator etc. I know it's a bit overdone.//
        try{
            char operatorThing = JOptionPane.showInputDialog("Operator:").charAt(0);
            setOperator(operatorThing);
            setOperatorWord(getOperatorWord(operator, 1));
            defineNameOfNumbers(operatorThing);
            }
        //catch a NotAnOperatorException (defined with NotAnOperatorException.class)//
            catch(NotAnOperatorException exc){
                Writer writer = new StringWriter();
                PrintWriter printWriter = new PrintWriter(writer);
                exc.printStackTrace(printWriter);
                String excSentence = writer.toString();
                JOptionPane.showMessageDialog(null,"Something went wrong... Here's the rundown on what happened:\n"+excSentence+"\nWe've figured out what happened, though.\nThat's not an operator...\nRestart to rerun it, it will exit for safety.");
                System.exit(0);
            }
        //catch a null pointer//
            catch(NullPointerException exc){
                JOptionPane.showMessageDialog(null,"You clicked Cancel. Press OK to quit.");
                System.exit(0);
        }
        //catch an other exception//
            catch(Exception exc){
                Writer writer = new StringWriter();
                PrintWriter printWriter = new PrintWriter(writer);
                exc.printStackTrace(printWriter);
                String excSentence = writer.toString();
                JOptionPane.showMessageDialog(null,"Something went wrong... Here's the rundown on what happened:\n"+excSentence+"\nI have no idea what happened.\nRestart to rerun it, it will exit for safety.");
                System.exit(0);
            }
        //get the response with "int response"//
        int response;
            response = JOptionPane.showConfirmDialog(null, "Would you like to start "+getOperatorWord(operator, 2)+" Calc?");
    if(response == JOptionPane.YES_OPTION){
        String numberOne = JOptionPane.showInputDialog("X"+operator+"Y=Z\nEnter the "+nameOfFirstNumber+" (the first number.)");
        firstNumber = Double.parseDouble(numberOne);
        String numberTwo = JOptionPane.showInputDialog(firstNumber+operator+"Y=Z\nEnter the "+nameOfSecondNumber+" (the second number.)");
        secondNumber = Double.parseDouble(numberTwo);

        if(operator == '/'||operator == '%'){
            int response3 =
            JOptionPane.showConfirmDialog(null, firstNumber+operator+secondNumber+"="+getAnswer()+getRemainderString()+"\n Would you like to start "+getOperatorWord(operator, 2)+" Calc again?");
            if(response3 == JOptionPane.YES_OPTION){
                setResponse2(true);
            }
            else if(response3 == JOptionPane.NO_OPTION||response3 == JOptionPane.CANCEL_OPTION){
                setResponse2(false);
                System.exit(0);
            }
        }
        else{
            int response3 =
            JOptionPane.showConfirmDialog(null, firstNumber+operator+secondNumber+"="+getAnswer()+"\n Would you like to start "+getOperatorWord(operator, 2)+" Calc again?");
            if(response3 == JOptionPane.YES_OPTION){
                setResponse2(true);
            }
            else if(response3 == JOptionPane.NO_OPTION||response3 == JOptionPane.CANCEL_OPTION){
                setResponse2(false);
                System.exit(0);
            }
        }
    }


    }
    while(response2 == JOptionPane.YES_OPTION);


}

}

Okay I know that’s a load of code. Sorry, but…
When the dialog shows up that says "X"+operator+"Y=Z\nEnter the "+nameOfFirstNumber+" (the first number.)", if I type 1 (in the next dialog) it says "48.0Y=Z" (if its in division mode.) It doesn’t even show the operator and I didn’t type 48, I typed 1. In other modes it says some number from 40 to 50. What’s going on here? It’s very strange…

Thanks!

[EDIT] Okay it has something to do with ASCII. But how can I fix it?
[EDIT] And why does it not show the operator?

Answer 1

Wrap your numbers using String.valueOf()method e.g.

String numberTwo = 
 JOptionPane.showInputDialog(String.valueOf(firstNumber)+operator+"Y=Z\nEnter the "
                       +nameOfSecondNumber+" (the second number.)");