Question

所以我有一个数学方程，我需要在java中使用但由于某种原因我的代码给了我小错误：（

在额外学分

部分的this web page上描述了数学等式

我目前的代码输出4000而且回答是4005我错了什么？

我的测试类看起来像这样

        public class MainActivity {
            public static void main(String[] args) throws Exception{
                double baseMaterial =556;
                int me =5;
                int ml = 10;
                int extraMaterial = 3444;
                System.out.println(""+calculateMiniralTotal(baseMaterial,me,ml,extraMaterial));
            }
            public static double calculateMiniralTotal(double perfekt,int me,int ml,int extraMaterial) {
                double s = (perfekt + (perfekt * (10 / (ml + 1)) / 100));
                s = Math.round(s);
                double r = s + (perfekt * (0.25 - (0.05 * me)));
                r = Math.round(r);
                double q = extraMaterial + (extraMaterial * (0.25 - (0.05 * me)));
                q = Math.round(q);
                //double r=q;
                r = r + q;
                return Math.round(r);
            }
        }

Answer 1

您正在使用(10 / (ml + 1)) / 100执行整数除法，在Java中必须生成另一个int。您的ml为10，而在Java中，10 / 11为0，而非0.909 ...，并且s没有添加任何内容。

使用double字面值或强制转换为double来强制进行浮点计算。

double s = (perfekt + (perfekt * (10.0 / (ml + 1)) / 100));

或

double s = (perfekt + (perfekt * ( (double) 10 / (ml + 1)) / 100));

进行任何更改都会产生输出：

4005.0

Answer 2

当你将一个double乘以一个int时，你会得到一个int。

public class Main
{

    public static void main(String[] args)
        throws Exception
    {
        double baseMaterial = 556;
        int me = 5;
        int ml = 10;
        int extraMaterial = 3444;
        System.out.println("" + calculateMiniralTotal(baseMaterial, me, ml, extraMaterial));

    }

    public static double calculateMiniralTotal(double perfekt, int me, int ml, int extraMaterial)
    {
        double s = (perfekt + (perfekt * (10.0 / (ml + 1)) / 100.0)); // <-- changed from 10 to 10.0 and 100 to 100.0. This way they are doubles too
        s = Math.round(s);
        double r = s + (perfekt * (0.25 - (0.05 * me)));
        r = Math.round(r);
        double q = extraMaterial + (extraMaterial * (0.25 - (0.05 * me)));
        q = Math.round(q);
        //                          double r=q;

        r = r + q;
        return Math.round(r);
    }
}

基本数学方程数学到java代码

2 个答案: