Question

我正在尝试创建一个简单的数学测验，该测验不能在问题中创建负数或对它们进行计数，但是我不确定我该如何处理。我不想列出一大堆问题，因为每个部分等都包含从0到15的每个数字，这毫无意义。

我的实际代码

public void setQuestion() {
    Random rand = new Random();
    int lhs = ThreadLocalRandom.current().nextInt(0,15);
    int rhs = ThreadLocalRandom.current().nextInt(0,15);

    int randomquestion = rand.nextInt(2);
    if (randomquestion == 1) {
        question.setText("What is  " + lhs + " + " + rhs + "?");
        expected = "" + (lhs + rhs);
    } else if (randomquestion == 2 ) {
        question.setText("What is  " + lhs + " - " + rhs + "?");
        expected = "" + (lhs - rhs);
    } else {
        question.setText("What is " + lhs +  " * " + rhs + "?");
        expected = "" + (lhs * rhs);
    }
    sumanswer.setText("You have got " + correctanswer +" CORRECT and " + wronganswer + " WRONG");

Answer 1

这很简单，在其他情况下，如果为“-”，则您要求lhs必须大于rhs。与此类似：

} else if (randomquestion == 2 ) {
    if(lhs>rhs){
        question.setText("What is  " + lhs + " - " + rhs + "?");
        expected = "" + (lhs - rhs);
    }else{
        question.setText("What is  " + rhs + " - " + lhs + "?");
        expected = "" + (rhs - lhs);
    }
}

Answer 2

如果我正确理解了这个问题，那么您不想在减法部分得到一个负数吗？您可以做一些简单的数学运算，以确保从较大的数中减去两个较小的数。试试这个：

question.setText("What is " + Math.Max(lhs, rhs) + " - " + Math.Min(lhs, rhs) + "?");
expected = "" + (Math.Max(lhs, rhs) - Math.Min(lhs, rhs));

如何防止负数？

2 个答案: