如何使用Unity制作一个简易的计算器

这篇文章给大家分享的是有关如何使用Unity制作一个简易的计算器的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。

一、前言

Hello，又见面了，今天分享如何使用Unity制作计算器，难度中等，可以用来学习，或者当成其他项目的小组件导入。

当然，也可以导出来，发布到网页端，来做一个嵌入式工具也可以。

二、效果图及源工程

效果图：

源工程

三、实现

1.界面搭建

所有的按钮摆放到Background下面。

2.代码实现

首先找到所有的按钮，添加到事件：

           //结果显示        TextComputeProcess = GameObject.Find("Canvas/Background/Image/TextComputeProcess").GetComponent();        TextComputeResult = GameObject.Find("Canvas/Background/Image/TextComputeResult").GetComponent();        TextComputeResult.text = "0";        RUNSTATE = 0;        //操作        BtnReset = GameObject.Find("Canvas/Background/重置").GetComponent();        BtnReset.onClick.AddListener(() => OperationDispose("CE"));        BtnDelete = GameObject.Find("Canvas/Background/删除").GetComponent();        BtnDelete.onClick.AddListener(() => OperationDispose("Del"));        //加减乘除        BtnAdd = GameObject.Find("Canvas/Background/加").GetComponent();        BtnAdd.onClick.AddListener(() => OperationDispose("+"));        BtnSub = GameObject.Find("Canvas/Background/减").GetComponent();        BtnSub.onClick.AddListener(() => OperationDispose("-"));        BtnMul = GameObject.Find("Canvas/Background/乘").GetComponent();        BtnMul.onClick.AddListener(() => OperationDispose("*"));        BtnDiv = GameObject.Find("Canvas/Background/除").GetComponent();        BtnDiv.onClick.AddListener(() => OperationDispose("/"));        BtnEqual = GameObject.Find("Canvas/Background/等于").GetComponent();        BtnEqual.onClick.AddListener(() => OperationDispose("="));        //数字        Btn0 = GameObject.Find("Canvas/Background/0").GetComponent();        Btn0.onClick.AddListener(() => NumDispose("0"));        Btn1 = GameObject.Find("Canvas/Background/1").GetComponent();        Btn1.onClick.AddListener(() => NumDispose("1"));        Btn2 = GameObject.Find("Canvas/Background/2").GetComponent();        Btn2.onClick.AddListener(() => NumDispose("2"));        Btn3 = GameObject.Find("Canvas/Background/3").GetComponent();        Btn3.onClick.AddListener(() => NumDispose("3"));        Btn4 = GameObject.Find("Canvas/Background/4").GetComponent();        Btn4.onClick.AddListener(() => NumDispose("4"));        Btn5 = GameObject.Find("Canvas/Background/5").GetComponent();        Btn5.onClick.AddListener(() => NumDispose("5"));        Btn6 = GameObject.Find("Canvas/Background/6").GetComponent();        Btn6.onClick.AddListener(() => NumDispose("6"));        Btn7 = GameObject.Find("Canvas/Background/7").GetComponent();        Btn7.onClick.AddListener(() => NumDispose("7"));        Btn8 = GameObject.Find("Canvas/Background/8").GetComponent();        Btn8.onClick.AddListener(() => NumDispose("8"));        Btn9 = GameObject.Find("Canvas/Background/9").GetComponent();        Btn9.onClick.AddListener(() => NumDispose("9"));        BtnPoint = GameObject.Find("Canvas/Background/点").GetComponent();        BtnPoint.onClick.AddListener(() => NumDispose("."));        BtnPm = GameObject.Find("Canvas/Background/正负").GetComponent();        BtnPm.onClick.AddListener(() => NumDispose("-"));

按钮操作：

   //操作点击处理    private void OperationDispose(string operation)    {        switch (operation)        {            case "+":                if (RUNSTATE == 0)                    TextComputeProcess.text = "0 + ";                else                {                    TextComputeProcess.text = TextComputeResult.text + " + ";                    m_operation = "+";                    RUNSTATE = 2;                }                break;            case "-":                if (RUNSTATE == 0)                    TextComputeProcess.text = "0 - ";                else                {                    TextComputeProcess.text = TextComputeResult.text + " - ";                    m_operation = "-";                    RUNSTATE = 2;                }                break;            case "*":                if (RUNSTATE == 0)                    TextComputeProcess.text = "0 * ";                else                {                    TextComputeProcess.text = TextComputeResult.text + " * ";                    m_operation = "*";                    RUNSTATE = 2;                }                break;            case "/":                if (RUNSTATE == 0)                    TextComputeProcess.text = "0 / ";                else                {                    TextComputeProcess.text = TextComputeResult.text + " / ";                    m_operation = "/";                    RUNSTATE = 2;                }                break;            case "=":                if (RUNSTATE == 0)                    TextComputeProcess.text = "0 = ";                else                {                    if (RUNSTATE == 3)                    {                        double result;                        switch (m_operation)                        {                            case "+":                                result = double.Parse(calculateString) + double.Parse(TextComputeResult.text);                                TextComputeProcess.text = calculateString + " + " + TextComputeResult.text + " = ";                                TextComputeResult.text = result.ToString();                                RUNSTATE = 4;                                break;                            case "-":                                result = double.Parse(calculateString) - double.Parse(TextComputeResult.text);                                TextComputeProcess.text = calculateString + " - " + TextComputeResult.text + " = ";                                TextComputeResult.text = result.ToString();                                RUNSTATE = 4;                                break;                            case "*":                                result = double.Parse(calculateString) * double.Parse(TextComputeResult.text);                                TextComputeProcess.text = calculateString + " * " + TextComputeResult.text + " = ";                                TextComputeResult.text = result.ToString();                                RUNSTATE = 4;                                break;                            case "/":                                result = double.Parse(calculateString) / double.Parse(TextComputeResult.text);                                TextComputeProcess.text = calculateString + " / " + TextComputeResult.text + " = ";                                TextComputeResult.text = result.ToString();                                RUNSTATE = 4;                                break;                            default:                                break;                        }                    }                    else                    {                        TextComputeProcess.text = TextComputeResult.text + " = ";                    }                }                break;            case "CE":                TextComputeProcess.text = "";                TextComputeResult.text = "0";                RUNSTATE = 0;                break;            case "Del":                if (RUNSTATE == 0)                    return;                else                {                    if (TextComputeResult.text.Length == 1)                    {                        TextComputeResult.text = "0";                    }                    else                    {                        TextComputeResult.text = TextComputeResult.text.Remove(TextComputeResult.text.Length - 1, 1);                    }                }                break;            default:                break;        }    }

数字点击处理：

        //数字点击处理    private void NumDispose(string num)    {        switch (num)        {            case ".":                if (RUNSTATE == 0)                    TextComputeResult.text = "0";                else                    TextComputeResult.text += num;                break;            case "-":                if (RUNSTATE == 0)                    TextComputeResult.text = "0";                else                {                    if (RUNSTATE == 1)                    {                        if (pmState)                        {                            TextComputeResult.text = TextComputeResult.text.Remove(0, 1);                            pmState = false;                        }                        else                        {                            TextComputeResult.text = num + TextComputeResult.text;                            pmState = true;                        }                    }                    else if (RUNSTATE == 2)                    {                        pmState = false;                    }                    else if (RUNSTATE == 3)                    {                        if (pmState)                        {                            TextComputeResult.text = TextComputeResult.text.Remove(0, 1);                            pmState = false;                        }                        else                        {                            TextComputeResult.text = num + TextComputeResult.text;                            pmState = true;                        }                    }                    else if (RUNSTATE == 4)                    {                        pmState = false;                        OperationDispose("CE");                    }                }                break;            default:                if (RUNSTATE == 0)                {                    TextComputeResult.text = num;                    RUNSTATE = 1;                }                else if (RUNSTATE == 1)                {                    pmState = false;                    TextComputeResult.text += num;                }                else if (RUNSTATE == 2)                {                    calculateString = TextComputeResult.text;                    TextComputeResult.text = "";                    TextComputeResult.text += num;                    RUNSTATE = 3;                }                else if (RUNSTATE == 3)                {                    TextComputeResult.text += num;                }                else if (RUNSTATE == 4)                {                    OperationDispose("CE");                    TextComputeResult.text = num;                    RUNSTATE = 1;                }                break;        }    }

完整代码：

using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.UI;public class CalculatorControl : MonoBehaviour{    private Text TextComputeProcess;//计算过程    private Text TextComputeResult;//计算结果    private Button BtnReset;    private Button BtnDelete;    private Button BtnAdd;    private Button BtnSub;    private Button BtnMul;    private Button BtnDiv;    private Button BtnEqual;    private Button Btn0, Btn1, Btn2, Btn3, Btn4, Btn5, Btn6, Btn7, Btn8, Btn9;    private Button BtnPoint, BtnPm;    private string calculateString = "";//计算数    private string m_operation = "";//操作数    private bool pmState = false;//正负状态    private int RUNSTATE = 0;//0 默认 1 输入数字 2 输入操作符 3 输入操作符再输入数字 4 计算结果后    void Start()    {        //结果显示        TextComputeProcess = GameObject.Find("Canvas/Background/Image/TextComputeProcess").GetComponent();        TextComputeResult = GameObject.Find("Canvas/Background/Image/TextComputeResult").GetComponent();        TextComputeResult.text = "0";        RUNSTATE = 0;        //操作        BtnReset = GameObject.Find("Canvas/Background/重置").GetComponent();        BtnReset.onClick.AddListener(() => OperationDispose("CE"));        BtnDelete = GameObject.Find("Canvas/Background/删除").GetComponent();        BtnDelete.onClick.AddListener(() => OperationDispose("Del"));        //加减乘除        BtnAdd = GameObject.Find("Canvas/Background/加").GetComponent();        BtnAdd.onClick.AddListener(() => OperationDispose("+"));        BtnSub = GameObject.Find("Canvas/Background/减").GetComponent();        BtnSub.onClick.AddListener(() => OperationDispose("-"));        BtnMul = GameObject.Find("Canvas/Background/乘").GetComponent();        BtnMul.onClick.AddListener(() => OperationDispose("*"));        BtnDiv = GameObject.Find("Canvas/Background/除").GetComponent();        BtnDiv.onClick.AddListener(() => OperationDispose("/"));        BtnEqual = GameObject.Find("Canvas/Background/等于").GetComponent();        BtnEqual.onClick.AddListener(() => OperationDispose("="));        //数字        Btn0 = GameObject.Find("Canvas/Background/0").GetComponent();        Btn0.onClick.AddListener(() => NumDispose("0"));        Btn1 = GameObject.Find("Canvas/Background/1").GetComponent();        Btn1.onClick.AddListener(() => NumDispose("1"));        Btn2 = GameObject.Find("Canvas/Background/2").GetComponent();        Btn2.onClick.AddListener(() => NumDispose("2"));        Btn3 = GameObject.Find("Canvas/Background/3").GetComponent();        Btn3.onClick.AddListener(() => NumDispose("3"));        Btn4 = GameObject.Find("Canvas/Background/4").GetComponent();        Btn4.onClick.AddListener(() => NumDispose("4"));        Btn5 = GameObject.Find("Canvas/Background/5").GetComponent();        Btn5.onClick.AddListener(() => NumDispose("5"));        Btn6 = GameObject.Find("Canvas/Background/6").GetComponent();        Btn6.onClick.AddListener(() => NumDispose("6"));        Btn7 = GameObject.Find("Canvas/Background/7").GetComponent();        Btn7.onClick.AddListener(() => NumDispose("7"));        Btn8 = GameObject.Find("Canvas/Background/8").GetComponent();        Btn8.onClick.AddListener(() => NumDispose("8"));        Btn9 = GameObject.Find("Canvas/Background/9").GetComponent();        Btn9.onClick.AddListener(() => NumDispose("9"));        BtnPoint = GameObject.Find("Canvas/Background/点").GetComponent();        BtnPoint.onClick.AddListener(() => NumDispose("."));        BtnPm = GameObject.Find("Canvas/Background/正负").GetComponent();        BtnPm.onClick.AddListener(() => NumDispose("-"));    }    //操作点击处理    private void OperationDispose(string operation)    {        switch (operation)        {            case "+":                if (RUNSTATE == 0)                    TextComputeProcess.text = "0 + ";                else                {                    TextComputeProcess.text = TextComputeResult.text + " + ";                    m_operation = "+";                    RUNSTATE = 2;                }                break;            case "-":                if (RUNSTATE == 0)                    TextComputeProcess.text = "0 - ";                else                {                    TextComputeProcess.text = TextComputeResult.text + " - ";                    m_operation = "-";                    RUNSTATE = 2;                }                break;            case "*":                if (RUNSTATE == 0)                    TextComputeProcess.text = "0 * ";                else                {                    TextComputeProcess.text = TextComputeResult.text + " * ";                    m_operation = "*";                    RUNSTATE = 2;                }                break;            case "/":                if (RUNSTATE == 0)                    TextComputeProcess.text = "0 / ";                else                {                    TextComputeProcess.text = TextComputeResult.text + " / ";                    m_operation = "/";                    RUNSTATE = 2;                }                break;            case "=":                if (RUNSTATE == 0)                    TextComputeProcess.text = "0 = ";                else                {                    if (RUNSTATE == 3)                    {                        double result;                        switch (m_operation)                        {                            case "+":                                result = double.Parse(calculateString) + double.Parse(TextComputeResult.text);                                TextComputeProcess.text = calculateString + " + " + TextComputeResult.text + " = ";                                TextComputeResult.text = result.ToString();                                RUNSTATE = 4;                                break;                            case "-":                                result = double.Parse(calculateString) - double.Parse(TextComputeResult.text);                                TextComputeProcess.text = calculateString + " - " + TextComputeResult.text + " = ";                                TextComputeResult.text = result.ToString();                                RUNSTATE = 4;                                break;                            case "*":                                result = double.Parse(calculateString) * double.Parse(TextComputeResult.text);                                TextComputeProcess.text = calculateString + " * " + TextComputeResult.text + " = ";                                TextComputeResult.text = result.ToString();                                RUNSTATE = 4;                                break;                            case "/":                                result = double.Parse(calculateString) / double.Parse(TextComputeResult.text);                                TextComputeProcess.text = calculateString + " / " + TextComputeResult.text + " = ";                                TextComputeResult.text = result.ToString();                                RUNSTATE = 4;                                break;                            default:                                break;                        }                    }                    else                    {                        TextComputeProcess.text = TextComputeResult.text + " = ";                    }                }                break;            case "CE":                TextComputeProcess.text = "";                TextComputeResult.text = "0";                RUNSTATE = 0;                break;            case "Del":                if (RUNSTATE == 0)                    return;                else                {                    if (TextComputeResult.text.Length == 1)                    {                        TextComputeResult.text = "0";                    }                    else                    {                        TextComputeResult.text = TextComputeResult.text.Remove(TextComputeResult.text.Length - 1, 1);                    }                }                break;            default:                break;        }    }    //数字点击处理    private void NumDispose(string num)    {        switch (num)        {            case ".":                if (RUNSTATE == 0)                    TextComputeResult.text = "0";                else                    TextComputeResult.text += num;                break;            case "-":                if (RUNSTATE == 0)                    TextComputeResult.text = "0";                else                {                    if (RUNSTATE == 1)                    {                        if (pmState)                        {                            TextComputeResult.text = TextComputeResult.text.Remove(0, 1);                            pmState = false;                        }                        else                        {                            TextComputeResult.text = num + TextComputeResult.text;                            pmState = true;                        }                    }                    else if (RUNSTATE == 2)                    {                        pmState = false;                    }                    else if (RUNSTATE == 3)                    {                        if (pmState)                        {                            TextComputeResult.text = TextComputeResult.text.Remove(0, 1);                            pmState = false;                        }                        else                        {                            TextComputeResult.text = num + TextComputeResult.text;                            pmState = true;                        }                    }                    else if (RUNSTATE == 4)                    {                        pmState = false;                        OperationDispose("CE");                    }                }                break;            default:                if (RUNSTATE == 0)                {                    TextComputeResult.text = num;                    RUNSTATE = 1;                }                else if (RUNSTATE == 1)                {                    pmState = false;                    TextComputeResult.text += num;                }                else if (RUNSTATE == 2)                {                    calculateString = TextComputeResult.text;                    TextComputeResult.text = "";                    TextComputeResult.text += num;                    RUNSTATE = 3;                }                else if (RUNSTATE == 3)                {                    TextComputeResult.text += num;                }                else if (RUNSTATE == 4)                {                    OperationDispose("CE");                    TextComputeResult.text = num;                    RUNSTATE = 1;                }                break;        }    }}

效果图如下：

四、后记

完整代码278行，还是依旧那么简练，整体代码难度不大，主要是状态之间的切换：

1、输入数字的状态

2、输入操作符状态

3、输入操作符后再输入数字状态

4、计算结果后状态

理解这些状态后，代码就容易理解了。

最后，拓展一下，将其他大佬写的代码给大家看一下，大家如果觉得上面的代码太简单，可以看一下：

代码使用OnGUI搭建界面，直接拖到任意对象上就可以看到效果了：

using UnityEngine;using System.Text.RegularExpressions;using System;public class Calculator2 : MonoBehaviour{    public static bool IsNumeric(string value)    {        return Regex.IsMatch(value, @"^[+-]?\d*[.]?\d*$");    }        public string result = "";//用来显示结果    public static string str1 = "";//第一个操作数    public static bool haveDot = false;//第二个操作数    public static bool isCaclutate = false;    void OnGUI()    {        //对数字进行处理        if (GUI.Button(new Rect(100, 100, 100, 60), "CE"))        {            result = "";            str1 = "";            haveDot = false;        }        if (GUI.Button(new Rect(210, 100, 100, 60), "×") && str1.Substring(str1.Length - 1, 1) != "-" && str1.Substring(str1.Length - 1, 1) != "+" && str1.Substring(str1.Length - 1, 1) != ".")        {            if (IsNumeric(str1.Substring(str1.Length - 1, 1)))            {                Debug.Log(str1.Substring(str1.Length - 1, 1));                str1 += "*";                haveDot = false;                isCaclutate = false;            }            result = str1;        }        if (GUI.Button(new Rect(320, 100, 100, 60), "÷") && str1.Substring(str1.Length - 1, 1) != "-" && str1.Substring(str1.Length - 1, 1) != "+" && str1.Substring(str1.Length - 1, 1) != ".")        {            if (IsNumeric(str1.Substring(str1.Length - 1, 1)))            {                str1 += "/";                haveDot = false;                isCaclutate = false;            }            result = str1;        }        if (GUI.Button(new Rect(430, 100, 100, 60), "←"))        {            if (isCaclutate == true)            {                str1 = "";                isCaclutate = false;            }            else if (result.Length != 0)            {                str1 = str1.Substring(0, str1.Length - 1);            }            result = str1;        }        if (GUI.Button(new Rect(100, 170, 100, 60), "1"))        {            if (isCaclutate == true)            {                str1 = "";                isCaclutate = false;                haveDot = false;            }            str1 += "1";            result = str1;        }        if (GUI.Button(new Rect(210, 170, 100, 60), "2"))        {            if (isCaclutate == true)            {                str1 = "";                isCaclutate = false;                haveDot = false;            }            str1 += "2";            result = str1;        }        if (GUI.Button(new Rect(320, 170, 100, 60), "3"))        {            if (isCaclutate == true)            {                str1 = "";                isCaclutate = false;                haveDot = false;            }            str1 += "3";            result = str1;        }        if (GUI.Button(new Rect(430, 170, 100, 60), "-"))        {            if (IsNumeric(str1.Substring(str1.Length - 1, 1)) && str1.Substring(str1.Length - 1, 1) != "-" && str1.Substring(str1.Length - 1, 1) != "+" && str1.Substring(str1.Length - 1, 1) != ".")            {                str1 += "-";                haveDot = false;                isCaclutate = false;            }            result = str1;        }        if (GUI.Button(new Rect(100, 240, 100, 60), "4"))        {            if (isCaclutate == true)            {                str1 = "";                isCaclutate = false;                haveDot = false;            }            str1 += "4";            result = str1;        }        if (GUI.Button(new Rect(210, 240, 100, 60), "5"))        {            if (isCaclutate == true)            {                str1 = "";                isCaclutate = false;                haveDot = false;            }            str1 += "5";            result = str1;        }        if (GUI.Button(new Rect(320, 240, 100, 60), "6"))        {            if (isCaclutate == true)            {                str1 = "";                isCaclutate = false;                haveDot = false;            }            str1 += "6";            result = str1;        }        if (GUI.Button(new Rect(430, 240, 100, 60), "+") && str1.Substring(str1.Length - 1, 1) != "+" && str1.Substring(str1.Length - 1, 1) != "-" && str1.Substring(str1.Length - 1, 1) != ".")        {            if (IsNumeric(str1.Substring(str1.Length - 1, 1)))            {                str1 += "+";                haveDot = false;                isCaclutate = false;            }            result = str1;        }        if (GUI.Button(new Rect(100, 310, 100, 60), "7"))        {            if (isCaclutate == true)            {                str1 = "";                isCaclutate = false;                haveDot = false;            }            str1 += "7";            result = str1;        }        if (GUI.Button(new Rect(210, 310, 100, 60), "8"))        {            if (isCaclutate == true)            {                str1 = "";                isCaclutate = false;                haveDot = false;            }            str1 += "8";            result = str1;        }        if (GUI.Button(new Rect(320, 310, 100, 60), "9"))        {            if (isCaclutate == true)            {                str1 = "";                isCaclutate = false;                haveDot = false;            }            str1 += "9";            result = str1;        }        if (GUI.Button(new Rect(430, 310, 100, 130), "="))        {            var tmp = Evaluator.Eval(result);            Debug.Log(tmp.ToString());            result = tmp.ToString();            str1 = result;            isCaclutate = true;            if (result.Contains("."))            {                haveDot = true;            }        }        if (GUI.Button(new Rect(100, 380, 210, 60), "0"))        {            if (isCaclutate == true)            {                str1 = "";                isCaclutate = false;                haveDot = false;            }            str1 += "0";            result = str1;        }        if (GUI.Button(new Rect(320, 380, 100, 60), "."))        {            if (isCaclutate == true)            {                str1 = "0.";                isCaclutate = false;            }            if (IsNumeric(str1.Substring(str1.Length - 1, 1)) && str1.Substring(str1.Length - 1, 1) != "." && haveDot == false)            {                Debug.Log(str1.Substring(str1.Length - 1, 1));                str1 += ".";                haveDot = true;                isCaclutate = false;            }            result = str1;        }        GUI.TextArea(new Rect(100, 20, 430, 60), result);    }    /**/    /// 
    /// 动态求值    /// 
    public class Evaluator    {        /**/        /// 
        /// 计算结果,如果表达式出错则抛出异常        /// 
        /// 表达式,如"1+2+3+4"        /// 结果        public static object Eval(string statement)        {            if (statement.Trim() != string.Empty)            {                Evaluator evaluator = new Evaluator();                return evaluator.GetFormulaResult(statement);            }            else            {                return null;            }        }        private object GetFormulaResult(string s)        {            if (s == "")            {                return null;            }            string S = BuildingRPN(s);            string tmp = "";            System.Collections.Stack sk = new System.Collections.Stack();            char c = ' ';            System.Text.StringBuilder Operand = new System.Text.StringBuilder();            double x, y;            for (int i = 0; i < S.Length; i++)            {                c = S[i];                //added c==',' for germany culture                if (char.IsDigit(c) || c == '.' || c == ',')                {                    //数据值收集.                    Operand.Append(c);                }                else if (c == ' ' && Operand.Length > 0)                {                    #region 运算数转换                    try                    {                        tmp = Operand.ToString();                        if (tmp.StartsWith("-"))//负数的转换一定要小心...它不被直接支持.                        {                            //现在我的算法里这个分支可能永远不会被执行.                            sk.Push(-((double)Convert.ToDouble(tmp.Substring(1, tmp.Length - 1))));                        }                        else                        {                            sk.Push(Convert.ToDouble(tmp));                        }                    }                    catch                    {                        return null; //                    }                    Operand = new System.Text.StringBuilder();                    #endregion                }                else if (c == '+'//运算符处理.双目运算处理.                    || c == '-'                    || c == '*'                    || c == '/'                    || c == '%'                    || c == '^')                {                    #region 双目运算                    if (sk.Count > 0)/*如果输入的表达式根本没有包含运算符.或是根本就是空串.这里的逻辑就有意义了.*/                    {                        y = (double)sk.Pop();                    }                    else                    {                        sk.Push(0);                        break;                    }                    if (sk.Count > 0)                        x = (double)sk.Pop();                    else                    {                        sk.Push(y);                        break;                    }                    switch (c)                    {                        case '+':                            sk.Push(x + y);                            break;                        case '-':                            sk.Push(x - y);                            break;                        case '*':                            if (y == 0)                            {                                sk.Push(x * 1);                            }                            else                            {                                sk.Push(x * y);                            }                            break;                        case '/':                            if (y == 0)                            {                                sk.Push(x / 0);                            }                            else                            {                                sk.Push(x / y);                            }                            break;                        case '%':                            sk.Push(x % y);                            break;                        case '^'://                            if (x > 0)//                            {                                //我原本还想,如果被计算的数是负数,又要开真分数次方时如何处理的问题.后来我想还是算了吧.                                sk.Push(System.Math.Pow(x, y));                                //                            }                            //                            else//                            {                                //                                double t = y;                                //                                string ts = "";                                //                                t = 1 / (2 * t);                                //                                ts = t.ToString();                                //                                if (ts.ToUpper().LastIndexOf('E') > 0)//                                {                                    //                                    ;                                    //                                }                                //                            }                            break;                    }                    #endregion                }                else if (c == '!')//单目取反. )                {                    sk.Push(-((double)sk.Pop()));                }            }            if (sk.Count > 1)            {                return null;//;            }            if (sk.Count == 0)            {                return null;//;            }            return sk.Pop();        }        /**/        /// 
        ///         /// 
        private string BuildingRPN(string s)        {            System.Text.StringBuilder sb = new System.Text.StringBuilder(s);            System.Collections.Stack sk = new System.Collections.Stack();            System.Text.StringBuilder re = new System.Text.StringBuilder();            char c = ' ';            //sb.Replace( " ","" );            //一开始,我只去掉了空格.后来我不想不支持函数和常量能滤掉的全OUT掉.            for (int i = 0; i < sb.Length; i++)            {                c = sb[i];                //added c==',' for german culture                if (char.IsDigit(c) || c == ',')//数字当然要了.                    re.Append(c);                //if( char.IsWhiteSpace( c )||                char.IsLetter(c);//如果是空白,那么不要.现在字母也不要.                //continue;                switch (c)//如果是其它字符...列出的要,没有列出的不要.                {                    case '+':                    case '-':                    case '*':                    case '/':                    case '%':                    case '^':                    case '!':                    case '(':                    case ')':                    case '.':                        re.Append(c);                        break;                    default:                        continue;                }            }            sb = new System.Text.StringBuilder(re.ToString());            #region 对负号进行预转义处理.负号变单目运算符求反.            for (int i = 0; i < sb.Length - 1; i++)                if (sb[i] == '-' && (i == 0 || sb[i - 1] == '('))                    sb[i] = '!';            //字符转义.            #endregion            #region 将中缀表达式变为后缀表达式.            re = new System.Text.StringBuilder();            for (int i = 0;                i < sb.Length;                i++)            {                if (char.IsDigit(sb[i]) || sb[i] == '.')//如果是数值.                {                    re.Append(sb[i]);                    //加入后缀式                }                else if (sb[i] == '+'                    || sb[i] == '-'                    || sb[i] == '*'                    || sb[i] == '/'                    || sb[i] == '%'                    || sb[i] == '^'                    || sb[i] == '!')//.                {                    #region 运算符处理                    while (sk.Count > 0) //栈不为空时                    {                        c = (char)sk.Pop();                        //将栈中的操作符弹出.                        if (c == '(') //如果发现左括号.停.                        {                            sk.Push(c);                            //将弹出的左括号压回.因为还有右括号要和它匹配.                            break;                            //中断.                        }                        else                        {                            if (Power(c) < Power(sb[i]))//如果优先级比上次的高,则压栈.                            {                                sk.Push(c);                                break;                            }                            else                            {                                re.Append(' ');                                re.Append(c);                            }                            //如果不是左括号,那么将操作符加入后缀式中.                        }                    }                    sk.Push(sb[i]);                    //把新操作符入栈.                    re.Append(' ');                    #endregion                }                else if (sb[i] == '(')//基本优先级提升                {                    sk.Push('(');                    re.Append(' ');                }                else if (sb[i] == ')')//基本优先级下调                {                    while (sk.Count > 0) //栈不为空时                    {                        c = (char)sk.Pop();                        //pop Operator                        if (c != '(')                        {                            re.Append(' ');                            re.Append(c);                            //加入空格主要是为了防止不相干的数据相临产生解析错误.                            re.Append(' ');                        }                        else                            break;                    }                }                else                    re.Append(sb[i]);            }            while (sk.Count > 0)//这是最后一个弹栈啦.            {                re.Append(' ');                re.Append(sk.Pop());            }            #endregion            re.Append(' ');            return FormatSpace(re.ToString());            //在这里进行一次表达式格式化.这里就是后缀式了.          }        /// 
          /// 优先级别测试函数.          /// 
          ///           ///           private static int Power(char opr)        {            switch (opr)            {                case '+':                case '-':                    return 1;                case '*':                case '/':                    return 2;                case '%':                case '^':                case '!':                    return 3;                default:                    return 0;            }        }        /// 
          /// 规范化逆波兰表达式.        /// 
          ///           ///           private static string FormatSpace(string s)        {            System.Text.StringBuilder ret = new System.Text.StringBuilder();            for (int i = 0; i < s.Length; i++)            {                if (!(s.Length > i + 1 && s[i] == ' ' && s[i + 1] == ' '))                    ret.Append(s[i]);                else                    ret.Append(s[i]);            }            return ret.ToString();            //.Replace( '!','-' );        }    }}

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