How do I add subtraction, multiplication and division to get random questions for the user to answer and not just addition?

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How do I add subtraction, multiplication and division to get random questions for the user to answer and not just addition? Like how do I get the math equations in my code and then mix them up?

C#

public void generateQuestion() {
        Random rand = new Random();
        int a = rand.nextInt(21);
        int b = rand.nextInt(21);
        sumTexrView.setText(Integer.toString(a) + " + " + Integer.toString(b));
        locationOfCorrectAnswer = rand.nextInt(4);
        answers.clear();
        int incorrectAnswer;
        for (int i=0; i<4; i++) {
            if (i == locationOfCorrectAnswer) {
                answers.add(a + b);
            } else {
                incorrectAnswer = rand.nextInt(41);
                while (incorrectAnswer == a + b) {
                    incorrectAnswer = rand.nextInt(41);
                }
                answers.add(incorrectAnswer);
            }
        }
        button0.setText(Integer.toString(answers.get(0)));
        button1.setText(Integer.toString(answers.get(1)));
        button2.setText(Integer.toString(answers.get(2)));
        button3.setText(Integer.toString(answers.get(3)));
    }

What I have tried:

I've tried copying the for (int i=0; i<4; i++) {
if (i == locationOfCorrectAnswer) {
answers.add(a + b);
} else {
incorrectAnswer = rand.nextInt(41);
while (incorrectAnswer == a + b) {
incorrectAnswer = rand.nextInt(41);
}
answers.add(incorrectAnswer);
}
and putting -, * and / instead of + and putting it above the buttons code

Posted 14-Jun-16 11:49am

ZCSmouse

Updated 14-Jun-16 23:02pm

Patrice T

v3

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Comments

Maciej Los 14-Jun-16 16:52pm

Not a question at all! You have to provide more details about your issue and shortly describe what is "not working" and why.

ZCSmouse 14-Jun-16 17:02pm

I added more :)

Patrice T 14-Jun-16 19:38pm

Do you understand that we don't know what you talk about.
An explanation of what you want to do would be nice, just to get some context.

ZCSmouse 14-Jun-16 20:09pm

I'm building a brain training app and the user has to pick from four numbers to get the answer correct. Right now, my app only has addition questions to answer, and I was wondering how to make it to where they can answer subtraction, multiplication and division questions too. I'm sorry I didn't specify enough. :(

ZCSmouse 14-Jun-16 23:27pm

Do you get what I'm trying to get at?

1 solution

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Answer 1 · 2016-06-14T23:02:00

You most likely need a class that holds the question and the operation to get the answer. It can also provide the methoids for the calculations. Fill a list with the elements of the class and then select them at random. Once the user has selected a question, the code will display the text, accept the user's values, and calculate the answer based on the operation.

How do I add subtraction, multiplication and division to get random questions for the user to answer and not just addition?

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Solution 1

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How do I add subtraction, multiplication and division to get random questions for the user to answer and not just addition?

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Solution 1

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