本篇文章為大家展示了C#中怎么利用棧實(shí)現(xiàn)加減乘除運(yùn)算，內(nèi)容簡明扼要并且容易理解，絕對能使你眼前一亮，通過這篇文章的詳細(xì)介紹希望你能有所收獲。

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首先遇到左括號，直接壓入運(yùn)算符棧，然后是3，直接壓入數(shù)棧，然后遇到5，壓入數(shù)棧，遇到*，將其壓入運(yùn)算符棧，遇到右括號，將運(yùn)算符棧頂?shù)?取出，取出兩個數(shù)棧棧頂?shù)臄?shù)，進(jìn)行乘法運(yùn)算，將運(yùn)算結(jié)果壓入數(shù)棧，因?yàn)榇藭r運(yùn)算符棧頂仍不是左括號，取出棧頂?shù)?號，拿出數(shù)棧棧頂?shù)膬蓚€數(shù)，進(jìn)行加法運(yùn)算，并將結(jié)果壓入數(shù)棧。此時棧頂是左括號了，那么將左括號彈出棧。此時數(shù)棧里還有一個23，運(yùn)算符棧為空。接著來。此時輪到了+號，直接壓入數(shù)棧，遇到3，直接壓入數(shù)棧。此時發(fā)現(xiàn)串已經(jīng)結(jié)尾了，但是運(yùn)算符棧還沒有清空。那么就清空吧，把+號拿出來，數(shù)棧的23和3拿出來，加法運(yùn)算，結(jié)果壓入數(shù)棧。此時運(yùn)算符棧清空，數(shù)棧剩個26。這就是最后的結(jié)果。是不是很簡單但是有一點(diǎn)云里霧里。。

說一下運(yùn)算規(guī)則吧。優(yōu)先級大家都知道了，優(yōu)先級從高到低依次是 "*/","+-","()"，每當(dāng)要壓運(yùn)算符時，首先得看看運(yùn)算符棧里有什么，如果沒有，肯定是可以直接壓入的，左括號也是可以不管三七二十一直接壓入的，除此之外，如果遇到棧頂運(yùn)算符優(yōu)先級更高時，是必須將棧頂運(yùn)算符先取出來運(yùn)算，直到棧頂元素優(yōu)先級小于或者等于要壓入的運(yùn)算符的優(yōu)先級才可壓入。比如3*5+5+5，在壓入第一個+號時，必須先將棧里的*號先拿出來運(yùn)算結(jié)束后，才能放進(jìn)去，否則計(jì)算結(jié)果將是錯誤的。當(dāng)壓入的是右括號時，必須一直彈運(yùn)算符棧進(jìn)行運(yùn)算，直到遇到左括號為止。當(dāng)串掃描到末尾時，也必須將運(yùn)算符棧清空，最后留在數(shù)棧的數(shù)就是結(jié)果。關(guān)于小數(shù)點(diǎn)，關(guān)于復(fù)數(shù)加減運(yùn)算，我寫的小程序里有了一定的處理

就類似于這樣的簡單功能。。。。恩，將就看看吧。。程序不完善，不過也懶得改了，畢竟是練習(xí)，最近事又多。

下面貼一下源碼

主要用到的幾個類和方法:

類Parser 的parse方法，比如給一個“3+4i”的字符串，返回給你一個3個結(jié)點(diǎn)的隊(duì)，隊(duì)列第一個元素是一個ComplexNumber對象，實(shí)數(shù)域?yàn)?，隊(duì)列的第二個元素是“+”號，隊(duì)列第三個元素是一個ComplexNumber對象，實(shí)數(shù)域?yàn)?,虛數(shù)域?yàn)?。

類Operators  用于測試字符是否是運(yùn)算符，用來進(jìn)行控制運(yùn)算，比較運(yùn)算符優(yōu)先級....

類Handler 給一個字符串，他幫你處理，返回給你一個結(jié)果。其實(shí)就是調(diào)一下Parser類的方法去解析一下字符串，然后算一下結(jié)果，然后返回結(jié)果。

類ComplexNumber，就是復(fù)數(shù)類啊，不用說了，提供實(shí)數(shù)域虛數(shù)域，getset方法，加減乘除以及toString()方法

using System;using System.Collections;using System.Text;namespace MySpace{class Parser{public static Queue Parse(string input){char[] arr = input.ToCharArray();Queue queue = new Queue();foreach(char x in arr){queue.Enqueue(x);}queue = ParseStringQueue(queue);return queue;}//傳入字符串隊(duì)列，返回封裝好的隊(duì)列。//ComplexNumber對象或char類型運(yùn)算符各占用一個結(jié)點(diǎn)private static Queue ParseStringQueue(Queue queue){Queue secondQ = new Queue();char c;StringBuilder sb = null;string temp;int count = queue.Count;bool flag = false; //false表示允許創(chuàng)建新SB對象進(jìn)行緩存數(shù)字字符串for(int i=0;i<count;i++){c = (char)queue.Dequeue();if(!Operators.Contains(c)){//如果掃描到的不是運(yùn)算符，則將其加入到buffer尾部if(!flag){flag = true;sb = new StringBuilder();}sb.Append(c);}if(Operators.Contains(c) || queue.Count == 0){//如果掃描到的是運(yùn)算符，則將緩沖區(qū)中的串加入隊(duì)尾if(sb != null && flag == true){temp = sb.ToString();try{if(temp.EndsWith("i")){if(temp.Length==1){secondQ.Enqueue(new ComplexNumber(0,1));}else{//i前有數(shù)字則開出數(shù)字部分。temp = temp.Substring(0,temp.Length-1);secondQ.Enqueue(new ComplexNumber(0,double.Parse(temp)));}}else{secondQ.Enqueue(new ComplexNumber(double.Parse(temp),0));}sb = null;flag = false;}catch(Exception e){Console.WriteLine("Error");}}//如果是運(yùn)算符，則最后將運(yùn)算符放入隊(duì)。if(Operators.Contains(c)){secondQ.Enqueue(c);}}}return secondQ;}}class ComplexNumber{private double m_dRealPart;private double m_dImaginPart;public ComplexNumber(){m_dRealPart = 0.0;m_dImaginPart = 0.0;}public ComplexNumber(double r,double i){m_dRealPart = r;m_dImaginPart = i;}public ComplexNumber(ComplexNumber c){m_dRealPart = c.GetRealPart();m_dImaginPart = c.GetImaginaryPart();}//get,set方法public double GetRealPart(){return m_dRealPart;}public double GetImaginaryPart(){  return m_dImaginPart;}public void SetRealPart(double d){  m_dRealPart = d;}public void SetImaginaryPart(double d){  m_dImaginPart = d;}public ComplexNumber ComplexAdd(ComplexNumber c){  return new ComplexNumber(this.m_dRealPart + c.GetRealPart(),this.m_dImaginPart + c.GetImaginaryPart());}public ComplexNumber ComplexAdd(double c){return new ComplexNumber(  this.m_dRealPart + c,this.m_dImaginPart);}public ComplexNumber ComplexMinus(ComplexNumber c){ return new ComplexNumber(this.m_dRealPart - c.GetRealPart(),this.m_dImaginPart - c.GetImaginaryPart());}public ComplexNumber ComplexMinus(double c){return new ComplexNumber(this.m_dRealPart - c, this.m_dImaginPart);}//乘public ComplexNumber ComplexMulti(ComplexNumber c){return new ComplexNumber(this.m_dRealPart * c.GetRealPart()- this.m_dImaginPart * c.GetImaginaryPart(),this.m_dRealPart *c.GetImaginaryPart()+ this.m_dImaginPart *c.GetRealPart());}public ComplexNumber ComplexMulti(double c){returnnew ComplexNumber(this.m_dRealPart * c,this.m_dImaginPart * c);}//除public ComplexNumber ComplexDivision(ComplexNumber c){returnnew ComplexNumber((this.m_dRealPart*c.GetRealPart()+this.m_dImaginPart*c.GetImaginaryPart())/(c.GetRealPart()*c.GetRealPart()+c.GetImaginaryPart()*c.GetImaginaryPart()),(this.m_dImaginPart*c.GetRealPart()-this.m_dRealPart*c.GetImaginaryPart())/(c.GetRealPart()*c.GetRealPart()+c.GetImaginaryPart()*c.GetImaginaryPart()));}public ComplexNumber ComplexDivision(double c){return newComplexNumber(this.m_dRealPart/c,this.m_dImaginPart/c);}public override String ToString(){ return "(" + m_dRealPart + " + " + m_dImaginPart + " i" + ")";}}class Operators{static char[][] signOperator;static Operators(){signOperator = new char[3][];signOperator[0] = new char[2];signOperator[0][0]='*';signOperator[0][1]='/';signOperator[1] = new char[2];signOperator[1][0]='+';signOperator[1][1]='-';signOperator[2] = new char[2];signOperator[2][0]='(';signOperator[2][1]=')';}public static int ComparePriority(char firstSign,char secondSign){int priorityF = 0,priorityS = 0;for(int i = 0; i<signOperator.Length;i++){foreach(char x in signOperator[i]){if(firstSign == x){priorityF = i;}if(secondSign == x){priorityS = i;}}}return (priorityF-priorityS);}public static bool Contains(char x){foreach(char[] arr in signOperator){foreach(char y in arr){if(x == y){return true;}}}return false;}public static ComplexNumber Compute(char ope,ComplexNumber c1,ComplexNumber c2){ComplexNumber result = null;switch(ope){case '+':result=c1.ComplexAdd(c2);break;case '-':result=c2.ComplexMinus(c1);break;case '*':result=c1.ComplexMulti(c2);break;case '/':result=c1.ComplexDivision(c2);break;}return result;}}class Handler{private Stack complexNumberStack = new Stack();private Stack operatorStack = new Stack();private static Handler handler = new Handler();private Handler(){}public static Handler GetHandler(){return handler;}public ComplexNumber Process(string inputString){Queue queue = Parser.Parse(inputString);ComplexNumber complexNumber = null;char c,top,ct;int count = queue.Count;for(int i=0;i<count;i++){Object obj = queue.Dequeue();if(obj is char){c = (char)obj;if(operatorStack.Count == 0){operatorStack.Push(c);}else{top = (char)operatorStack.Peek();if(c=='('){operatorStack.Push(c); //左括號直接壓入。不判斷棧頂}else if(c==')'){//右括號壓入前觀察棧頂，若棧頂是左括號，則彈出棧頂?shù)淖罄ㄌ?/否則彈出棧頂運(yùn)算符，從數(shù)棧中彈出操作數(shù)進(jìn)行運(yùn)算，并將結(jié)果重新壓入數(shù)棧，直到遇到左括號while((ct=(char)operatorStack.Pop())!='('){ComplexNumber c1 = (ComplexNumber)complexNumberStack.Pop();ComplexNumber c2 = (ComplexNumber)complexNumberStack.Pop();ComplexNumber c3 = Operators.Compute(ct,c1,c2);complexNumberStack.Push(c3);}}else if(Operators.ComparePriority(top,c)<0){//若即將壓入的運(yùn)算符不是括號，則比較棧頂運(yùn)算符和即將壓入的運(yùn)算符的優(yōu)先級//如果棧頂優(yōu)先級高，則將棧頂運(yùn)算符取出運(yùn)算，直到棧頂優(yōu)先級不大于其。while(Operators.ComparePriority((char)operatorStack.Peek(),c)<0){ComplexNumber c1 = (ComplexNumber)complexNumberStack.Pop();ComplexNumber c2 = (ComplexNumber)complexNumberStack.Pop();ComplexNumber c3 = Operators.Compute((char)operatorStack.Pop(),c1,c2);complexNumberStack.Push(c3);operatorStack.Push(c);}}else{operatorStack.Push(c);}}}else if(obj is ComplexNumber) {complexNumber = (ComplexNumber)obj;complexNumberStack.Push(complexNumber);}if(queue.Count == 0){if(operatorStack.Count != 0){while(operatorStack.Count != 0){c = (char)operatorStack.Pop();ComplexNumber c1 = (ComplexNumber)complexNumberStack.Pop();ComplexNumber c2 = (ComplexNumber)complexNumberStack.Pop();ComplexNumber c3 = Operators.Compute(c,c1,c2);complexNumberStack.Push(c3);}}}}return (ComplexNumber)complexNumberStack.Pop();}}class PrimeClass{static void Main(string[] args){String input;Handler handler = Handler.GetHandler();while(!(input = Console.ReadLine()).Equals("END")){ComplexNumber c = (ComplexNumber)handler.Process(input);Console.WriteLine(c);};}}}

Don_Yao整合修復(fù)一些bug后的代碼

using System;using System.Collections;using System.Collections.Generic;using System.Text;// 解析計(jì)算字符串公式namespace CalcuStrFormula{  // 處理類  class Handler  {    private Stack _complexNumberStack = new Stack();    private Stack _operatorStack = new Stack();    private Parser _parser = new Parser();    private Operators _operators = new Operators();    private static Handler _instance;    public static Handler instance    {      get      {        if (_instance == null)        {          _instance = new Handler();        }        return _instance;      }    }    public ComplexNumber Process(string inputString)    {      _complexNumberStack.Clear();      _operatorStack.Clear();      Queue<object> queue = _parser.Parse(inputString);      ComplexNumber complexNumber = null;      char op, topOp;      int count = queue.Count;      for (int i = 0; i < count; i++)      {        object obj = queue.Dequeue();        if (obj is char)        {          op = (char)obj;          if (_operatorStack.Count == 0)          {            _operatorStack.Push(op);          }          else          {            topOp = (char)_operatorStack.Peek();            if (op == '(')            {              _operatorStack.Push(op); // 左括號直接壓入。不判斷棧頂            }            else if (op == ')')            {              // 右括號壓入前觀察棧頂，若棧頂是左括號，則彈出棧頂?shù)淖罄ㄌ?             // 否則彈出棧頂運(yùn)算符，從數(shù)棧中彈出操作數(shù)進(jìn)行運(yùn)算，并將結(jié)果重新壓入數(shù)棧，直到遇到左括號              while ((topOp = (char)_operatorStack.Pop()) != '(')              {                ComplexNumber c1 = (ComplexNumber)_complexNumberStack.Pop(); // 符號右邊數(shù)                ComplexNumber c2 = null; // 符號左邊數(shù)                if (_operators.IsTwoNumOperator(topOp))                {                  c2 = (ComplexNumber)_complexNumberStack.Pop();                }                ComplexNumber c3 = _operators.Compute(topOp, c2, c1);                _complexNumberStack.Push(c3);              }            }            else if (_operators.ComparePriority(topOp, op) <= 0)            {              // 若即將壓入的運(yùn)算符不是括號，則比較棧頂運(yùn)算符和即將壓入的運(yùn)算符的優(yōu)先級              // 如果棧頂優(yōu)先級高，則將棧頂運(yùn)算符取出運(yùn)算，直到棧頂優(yōu)先級不大于其。              while (_operatorStack.Count != 0 && _operators.ComparePriority((char)_operatorStack.Peek(), op) <= 0)              {                topOp = (char)_operatorStack.Pop();                ComplexNumber c1 = (ComplexNumber)_complexNumberStack.Pop(); // 符號右邊數(shù)                ComplexNumber c2 = null; // 符號左邊數(shù)                if (_operators.IsTwoNumOperator(topOp))                {                  c2 = (ComplexNumber)_complexNumberStack.Pop();                }                ComplexNumber c3 = _operators.Compute(topOp, c2, c1);                _complexNumberStack.Push(c3);              }              _operatorStack.Push(op);            }            else            {              _operatorStack.Push(op);            }          }        }        else if (obj is ComplexNumber)        {          complexNumber = (ComplexNumber)obj;          _complexNumberStack.Push(complexNumber);        }        if (queue.Count == 0)        {          while (_operatorStack.Count != 0)          {            topOp = (char)_operatorStack.Pop();            ComplexNumber c1 = (ComplexNumber)_complexNumberStack.Pop(); // 符號右邊數(shù)            ComplexNumber c2 = null; // 符號左邊數(shù)            if (_operators.IsTwoNumOperator(topOp))            {              c2 = (ComplexNumber)_complexNumberStack.Pop();            }            ComplexNumber c3 = _operators.Compute(topOp, c2, c1);            _complexNumberStack.Push(c3);          }        }      }      return (ComplexNumber)_complexNumberStack.Pop();    }  }  // 3+4i解析成Queue包含 3, +, 4i  public class Parser  {    private Operators _operators = new Operators();    public Queue<object> Parse(string input)    {      input = input.Replace(" ", "");      if (input.StartsWith("-")) input = '0' + input;      char[] arr = input.ToCharArray();      Queue<char> queueChar = new Queue<char>();      foreach (char x in arr)      {        queueChar.Enqueue(x);      }      Queue<object> queueResult = ParseStringQueue(queueChar);      return queueResult;    }    // 傳入字符串隊(duì)列，返回封裝好的隊(duì)列。    // ComplexNumber對象或char類型運(yùn)算符各占用一個結(jié)點(diǎn)    private Queue<object> ParseStringQueue(Queue<char> queue)    {      Queue<object> secondQ = new Queue<object>();      char c;      StringBuilder sb = null;      string temp;      int count = queue.Count;      bool flag = false; // false表示允許創(chuàng)建新SB對象進(jìn)行緩存數(shù)字字符串      for (int i = 0; i < count; i++)      {        c = queue.Dequeue();        if (!_operators.Contains(c))        {          // 如果掃描到的不是運(yùn)算符，則將其加入到buffer尾部          if (!flag)          {            flag = true;            sb = new StringBuilder();          }          sb.Append(c);        }        if (_operators.Contains(c) || queue.Count == 0)        {          // 如果掃描到的是運(yùn)算符，則將緩沖區(qū)中的串加入隊(duì)尾          if (sb != null && flag == true)          {            temp = sb.ToString();            try            {              if (temp.EndsWith("i"))              {                if (temp.Length == 1)                {                  secondQ.Enqueue(new ComplexNumber(0, 1));                }                else                {                  // i前有數(shù)字則開出數(shù)字部分。                  temp = temp.Substring(0, temp.Length - 1);                  secondQ.Enqueue(new ComplexNumber(0, double.Parse(temp)));                }              }              else              {                secondQ.Enqueue(new ComplexNumber(double.Parse(temp), 0));              }              sb = null;              flag = false;            }            catch (Exception e)            {              UnityEngine.Debug.Log("Error " + e.ToString());            }          }          // 如果是運(yùn)算符，則最后將運(yùn)算符放入隊(duì)。          if (_operators.Contains(c))          {            secondQ.Enqueue(c);          }        }      }      return secondQ;    }  }  // 復(fù)數(shù)類，提供實(shí)數(shù)域虛數(shù)域，getset方法，加減乘除以及toString()方法  class ComplexNumber  {    private double _realPart; // 實(shí)數(shù)部分    private double _imaginPart; // 虛數(shù)部分    public ComplexNumber()    {      _realPart = 0.0;      _imaginPart = 0.0;    }    public ComplexNumber(double r, double i)    {      _realPart = r;      _imaginPart = i;    }    public ComplexNumber(ComplexNumber c)    {      _realPart = c.GetRealPart();      _imaginPart = c.GetImaginaryPart();    }    // get,set方法    public double GetRealPart()    {      return _realPart;    }    public double GetImaginaryPart()    {      return _imaginPart;    }    public void SetRealPart(double d)    {      _realPart = d;    }    public void SetImaginaryPart(double d)    {      _imaginPart = d;    }    // 加    public ComplexNumber ComplexAdd(ComplexNumber c)    {      return new ComplexNumber(_realPart + c.GetRealPart(), _imaginPart + c.GetImaginaryPart());    }    public ComplexNumber ComplexAdd(double c)    {      return new ComplexNumber(_realPart + c, _imaginPart);    }    // 減    public ComplexNumber ComplexMinus(ComplexNumber c)    {      return new ComplexNumber(_realPart - c.GetRealPart(), _imaginPart - c.GetImaginaryPart());    }    public ComplexNumber ComplexMinus(double c)    {      return new ComplexNumber(_realPart - c, _imaginPart);    }    // 乘    public ComplexNumber ComplexMulti(ComplexNumber c)    {      return new ComplexNumber(      _realPart * c.GetRealPart()      - _imaginPart * c.GetImaginaryPart(),      _realPart *      c.GetImaginaryPart()      + _imaginPart *      c.GetRealPart());    }    public ComplexNumber ComplexMulti(double c)    {      return new ComplexNumber(_realPart * c, _imaginPart * c);    }    // 除    public ComplexNumber ComplexDivision(ComplexNumber c)    {      return new ComplexNumber((_realPart * c.GetRealPart() + _imaginPart * c.GetImaginaryPart())        / (c.GetRealPart() * c.GetRealPart() + c.GetImaginaryPart() * c.GetImaginaryPart())        , (_imaginPart * c.GetRealPart() - _realPart * c.GetImaginaryPart())        / (c.GetRealPart() * c.GetRealPart() + c.GetImaginaryPart() * c.GetImaginaryPart()));    }    public ComplexNumber ComplexDivision(double c)    {      return new ComplexNumber(_realPart / c, _imaginPart / c);    }    // 冪    public ComplexNumber ComplexPow(ComplexNumber c)    {      int pow;      if (int.TryParse(c.GetRealPart().ToString(), out pow))      {        ComplexNumber origin = new ComplexNumber(this);        ComplexNumber multi = new ComplexNumber(this);        for (int i = 0; i < pow - 1; i++)        {          origin = origin.ComplexMulti(multi);        }        return origin;      }      else      {        return ComplexPow(c.GetRealPart());      }    }    public ComplexNumber ComplexPow(double c)    {      return new ComplexNumber(Math.Pow(_realPart, c), 0.0);    }    // 最小值    public ComplexNumber ComplexMinimum(ComplexNumber c)    {      if (_realPart <= c.GetRealPart()) return this;      return c;    }    // 最大值    public ComplexNumber ComplexMaximum(ComplexNumber c)    {      if (_realPart >= c.GetRealPart()) return this;      return c;    }    // 轉(zhuǎn)int    public ComplexNumber ToFloorInt()    {      _realPart = Math.Floor(_realPart);      return this;    }    public override string ToString()    {      return "(" + _realPart + " + " + _imaginPart + " i" + ")";    }  }  // 操作符類  class Operators  {    private char[][] _signOperator;    public Operators()    {      // 從上到下，優(yōu)先級由高到低      _signOperator = new char[4][];      _signOperator[0] = new char[4];      _signOperator[0][0] = '^';      _signOperator[0][1] = 's'; // 最小值      _signOperator[0][2] = 'b'; // 最大值      _signOperator[0][3] = 'i'; // int值      _signOperator[1] = new char[2];      _signOperator[1][0] = '*';      _signOperator[1][1] = '/';      _signOperator[2] = new char[2];      _signOperator[2][0] = '+';      _signOperator[2][1] = '-';      _signOperator[3] = new char[2];      _signOperator[3][0] = '(';      _signOperator[3][1] = ')';    }    // 比較操作符優(yōu)先級    public int ComparePriority(char firstSign, char secondSign)    {      int priorityF = 0, priorityS = 0;      for (int i = 0; i < _signOperator.Length; i++)      {        foreach (char x in _signOperator[i])        {          if (firstSign == x)          {            priorityF = i;          }          if (secondSign == x)          {            priorityS = i;          }        }      }      return (priorityF - priorityS);    }    // 是否是需要兩個參數(shù)的操作符    public bool IsTwoNumOperator(char op)    {      if (op == 'i') return false;      return true;    }    public bool Contains(char x)    {      if (x == '（' || x == '）')      {        UnityEngine.Debug.LogError(x + "為中文字符，請改為英文字符");      }      foreach (char[] arr in _signOperator)      {        foreach (char y in arr)        {          if (x == y)          {            return true;          }        }      }      return false;    }    public ComplexNumber Compute(char op, ComplexNumber c1, ComplexNumber c2)    {      ComplexNumber result = null;      switch (op)      {        case '+': result = c1.ComplexAdd(c2); break;        case '-': result = c1.ComplexMinus(c2); break;        case '*': result = c1.ComplexMulti(c2); break;        case '/': result = c1.ComplexDivision(c2); break;        case '^': result = c1.ComplexPow(c2); break;        case 's': result = c1.ComplexMinimum(c2); break;        case 'b': result = c1.ComplexMaximum(c2); break;        case 'i': result = c2.ToFloorInt(); break;      }      return result;    }  }}

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