表达式1 * 2 + 2 / 3-2 * 3 * 5 + 1/2/3的正确结果应该是 - 27.1666667，但我只能得到 - 27.1666666。为什么？

问题描述

这是我的计算器应用程序代码，我正在使用递归。

Here is my code for a calculator application, I'm using recursion.

public String execute(String screen_text)
        {
            String[] operand = {};
            String res = screen_text;
            double tmp=0;

            if (screen_text.Contains('+'))
            {
                operand = screen_text.Split('+');
                for (int a = 0; a < operand.Length; a++)
                    tmp += double.Parse(execute(operand[a]));
                
                res = Convert.ToString(tmp);
                return res;
            }
            else if (screen_text.Contains('-'))
            {
                operand = screen_text.Split('-');
                tmp = double.Parse(execute(operand[0]));
                for (int b = 1; b < operand.Length; b++)
                    tmp -= double.Parse(execute(operand[b]));
                
                res = Convert.ToString(tmp);
                return res;
            }
            else if (screen_text.Contains('x'))
            {
                operand = screen_text.Split('x');
                tmp = double.Parse(execute(operand[0]));
                for (int c = 1; c < operand.Length; c++)
                    tmp *= double.Parse(execute(operand[c]));
                
                res = Convert.ToString(tmp);
                return res;
            }
            else if (screen_text.Contains('/'))
            {
                operand = screen_text.Split('/');
                tmp = double.Parse(execute(operand[0]));
                for (int d = 1; d < operand.Length; d++)
                    tmp /= double.Parse(execute(operand[d]));
               
                res = Convert.ToString(tmp);
                return res;
            }
            else
            {
                return res;
            }

        }

我尝试过：



我试图使用Math.Round（res，6）将res小数点向上舍入到6，但它给出了相同的答案。我不知道还能做什么._。

What I have tried:

I've tried to round res decimals up only til 6 using Math.Round(res,6) but it gives the same answer. I don't know what else to do ._.

推荐答案

这篇关于表达式1 * 2 + 2 / 3-2 * 3 * 5 + 1/2/3的正确结果应该是 - 27.1666667，但我只能得到 - 27.1666666。为什么？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！