c#实战 计算器(支持加减乘除括号的混合计算)

c#计算器，支持+-*/()的混合运算，对负号不支持.

原理:将点击的按钮赋给inputStr，然后对inputStr分析、计算。看懂代码的重要前提是你有一定的算法基础（前缀、中缀、后缀表达式）和数据结构基础（链表、栈）。

当初写这份代码的时候还是小白，随着对C#的深入学习，个人觉得本文代码还有很多可以优化的地方。

wybing最后编辑于20190510

截图：

运行截图:

界面控制代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace 计算器
{
    public partial class FrmMain : Form
    {
        public static List inputStr=new List(1000);    //用户的输入
        public FrmMain()
        {
            InitializeComponent();
        }

        private void Btn0_Click(object sender, EventArgs e)
        {
            inputStr.Add('0');
            textBox1.AppendText("0");
        }

        private void BtnDot_Click(object sender, EventArgs e)
        {
            inputStr.Add('.');
            textBox1.AppendText(".");
        }

        private void Btn1_Click(object sender, EventArgs e)
        {
            inputStr.Add('1');
            textBox1.AppendText("1");
        }

        private void Btn2_Click(object sender, EventArgs e)
        {
            inputStr.Add('2');
            textBox1.AppendText("2");
        }

        private void Btn3_Click(object sender, EventArgs e)
        {
            inputStr.Add('3');
            textBox1.AppendText("3");
        }

        private void Btn4_Click(object sender, EventArgs e)
        {
            inputStr.Add('4');
            textBox1.AppendText("4");
        }

        private void Btn5_Click(object sender, EventArgs e)
        {
            inputStr.Add('5');
            textBox1.AppendText("5");
        }

        private void Btn6_Click(object sender, EventArgs e)
        {
            inputStr.Add('6');
            textBox1.AppendText("6");
        }

        private void Btn7_Click(object sender, EventArgs e)
        {
            inputStr.Add('7');
            textBox1.AppendText("7");
        }

        private void Btn8_Click(object sender, EventArgs e)
        {
            inputStr.Add('8');
            textBox1.AppendText("8");
        }

        private void Btn9_Click(object sender, EventArgs e)
        {
            inputStr.Add('9');
            textBox1.AppendText("9");
        }

        private void BtnLeft_Click(object sender, EventArgs e)
        {
            inputStr.Add('(');
            textBox1.AppendText("(");
        }

        private void BtnRig_Click(object sender, EventArgs e)
        {
            inputStr.Add(')');
            textBox1.AppendText(")");
        }

        private void BtnEqual_Click(object sender, EventArgs e)
        {
            //等号代码
            textBox1.AppendText("=");
            textBox2.Text = textBox1.Text;
            textBox1.Text = DataOp.DataMain();

            string temp= DataOp.DataMain();
            inputStr.Clear();
            for(int i = 0; i < temp.Length; i++)
            {
                inputStr.Add(temp[i]);
            }
        }

        private void BtnAdd_Click(object sender, EventArgs e)
        {
            inputStr.Add('+');
            textBox1.AppendText("+");
        }

        private void BtnSubt_Click(object sender, EventArgs e)
        {
            inputStr.Add('-');
            textBox1.AppendText("-");
        }

        private void BtnMul_Click(object sender, EventArgs e)
        {
            inputStr.Add('*');
            textBox1.AppendText("*");
        }

        private void BtnDivi_Click(object sender, EventArgs e)
        {
            inputStr.Add('/');
            textBox1.AppendText("/");
        }

        private void BtnCe_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            inputStr.Clear();       //清空链表的所有元素
        }

        private void BtnC_Click(object sender, EventArgs e)
        {
            //界面撤销
            inputStr.RemoveAt(inputStr.Count-1);
            textBox1.Text = "";
            for (int i=0;i

数据操作代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 计算器
{
    //表达式存在inputStr中
    class DataOp : FrmMain
    {
       static Stack m = new Stack();//数字栈
       static Stack s = new Stack();//符号栈
        public static void Read()   //Read()从inputStr输入流中读值
        {
            for (int i = 0; i < inputStr.Count; i++)    
            {
                if (!IsOperator(inputStr[i]))   //数字和小数点
                {
                    string s = null;
                    while (i < inputStr.Count && !IsOperator(inputStr[i]))
                    {
                        s += inputStr[i];
                        i++;
                    }
                    i--;
                    double mm = Convert.ToDouble(s);
                    m.Push(mm);
                }
                else if (IsOper(inputStr[i]))   //+ - * / 
                {
                    if (s.Count.Equals(0) || s.Peek().Equals('('))
                    {
                        s.Push(inputStr[i]);
                    }
                    else if (OperatorPrecedence(inputStr[i]) > OperatorPrecedence(s.Peek()))
                    {
                        s.Push(inputStr[i]);
                    }
                    else
                    {
                        double n1, n2;
                        char s1;
                        n2 = m.Pop();
                        n1 = m.Pop();
                        s1 = s.Pop();
                        double sum = Operat(n1, n2, s1);
                        m.Push(sum);
                        s.Push(inputStr[i]);
                    }
                }
                else                    //（和）
                {
                    if (inputStr[i].Equals('('))
                    {
                        s.Push(inputStr[i]);
                    }
                    else if (inputStr[i].Equals(')'))
                    {
                        while (!s.Peek().Equals('('))
                        {
                            double n1, n2;
                            char s1;
                            n2 = m.Pop();
                            n1 = m.Pop();
                            s1 = s.Pop();
                            double sum = Operat(n1, n2, s1);
                            m.Push(sum);
                        }
                        s.Pop();

                    }
                }
            }
        }
        public static double PopStack()
        {
            double sum = 0;
            while (s.Count != 0)
            {
                double n1, n2;
                char s1;
                n2 = m.Pop();
                n1 = m.Pop();
                s1 = s.Pop();
                sum = Operat(n1, n2, s1);
                m.Push(sum);
            }
            return sum;
        }
        public static bool IsOperator(char c)   //是否是操作符
        {
            if (c.Equals('+') || c.Equals('-') || c.Equals('*') || c.Equals('/') || c.Equals('(') || c.Equals(')'))
                return true;
            return false;
        }
        public static bool IsOper(char c)   //是否是运算符符
        {
            if (c.Equals('+') || c.Equals('-') || c.Equals('*') || c.Equals('/'))
                return true;
            return false;
        }
        public static int OperatorPrecedence(char a)    //操作符优先级
        {
            int i = 0;
            switch (a)
            {
                case '+': i = 3; break;
                case '-': i = 3; break;
                case '*': i = 4; break;
                case '/': i = 4; break;
            }
            return i;
        }
        public static double Operat(double n1, double n2, char s1)
        {
            double sum = 0;
            switch (s1)
            {
                case '+': sum = n1 + n2; break;
                case '-': sum = n1 - n2; break;
                case '*': sum = n1 * n2; break;
                case '/': sum = n1 / n2; break;
            }
            return sum;
        }
        public static string DataMain()
        {
            Read();
            return PopStack().ToString();
        }
    }
}

程序源代码下载地址：https://www.lanzous.com/i1x6mfc