如何添加减法，乘法和除法以获得用户回答的随机问题，而不仅仅是添加？ [英] How do I add subtraction, multiplication and division to get random questions for the user to answer and not just addition?

问题描述

如何添加减法，乘法和除法以获得用户回答的随机问题，而不仅仅是添加？就像我如何在我的代码中得到数学方程然后将它们混合起来？

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?

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)));
    }

我的尝试：



我试过复制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）;

}

和put - ，*和/而不是+并将它放在按钮代码上方

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

推荐答案

你最有可能需要一个包含问题和操作的类来获得答案。它还可以为计算提供方法。使用类的元素填充列表，然后随机选择它们。一旦用户选择了问题，代码将显示文本，接受用户的值，并根据操作计算答案。

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.

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