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 Calculator { public partial class 计算器 : Form { public static List inputStr = new List(1000); public 计算器() { InitializeComponent(); } public void addaNum(int num) { textBox1.Text = textBox1.Text + num.ToString(); }

    private void button11_Click(object sender, EventArgs e)
    {
        inputStr.Add('*');

        textBox1.AppendText("*");
    }

    private void button8_Click(object sender, EventArgs e)
    {
        inputStr.Add('7');

        textBox1.AppendText("7");
    }

    private void button12_Click(object sender, EventArgs e)
    {
        inputStr.Add('/');

        textBox1.AppendText("/");
    }

    private void button1_Click(object sender, EventArgs e)
    {
        inputStr.Add('8');

        textBox1.AppendText("8");
    }

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
        
    }

    private void button7_Click(object sender, EventArgs e)
    {
        textBox1.Text = "";

        inputStr.Clear();
        textBox2.Text = "";

        inputStr.Clear();
    }

    private void button6_Click(object sender, EventArgs e)
    {
        inputStr.Add('9');

        textBox1.AppendText("9");
    }

    private void button14_Click(object sender, EventArgs e)
    {
        inputStr.Add('4');

        textBox1.AppendText("4");
    }

    private void button13_Click(object sender, EventArgs e)
    {
        inputStr.Add('5');

        textBox1.AppendText("5");
    }

    private void button2_Click(object sender, EventArgs e)
    {
        inputStr.Add('6');

        textBox1.AppendText("6");
    }

    private void button15_Click(object sender, EventArgs e)
    {
        inputStr.Add('1');

        textBox1.AppendText("1");
    }

    private void button10_Click(object sender, EventArgs e)
    {
        inputStr.Add('2');

        textBox1.AppendText("2");
    }

    private void button5_Click(object sender, EventArgs e)
    {
        inputStr.Add('3');

        textBox1.AppendText("3");
    }

    private void button16_Click(object sender, EventArgs e)
    {
        textBox1.AppendText("=");

        textBox1.Text = textBox1.Text;

       textBox2.Text = DataOp.DataMain();
       string temp = DataOp.DataMain();
        inputStr.Clear();
        for (int i = 0; i < temp.Length; i++)
        {
            inputStr.Add(temp[i]);
        }
      
    }

    private void button17_Click(object sender, EventArgs e)
    {
        
    }

    private void button18_Click(object sender, EventArgs e)
    {
        inputStr.Add('0');
        textBox1.AppendText("0");
    }

    private void button19_Click(object sender, EventArgs e)
    {
        inputStr.Add('.');

        textBox1.AppendText(".");
    }

    private void button17_Click_1(object sender, EventArgs e)
    {
        inputStr.Add('(');

        textBox1.AppendText("(");
    }

    private void button20_Click(object sender, EventArgs e)
    {
        inputStr.Add(')');

        textBox1.AppendText(")");
    }

    private void button9_Click(object sender, EventArgs e)
    {
        inputStr.Add('+');

        textBox1.AppendText("+");
    }

    private void button4_Click(object sender, EventArgs e)
    {
        inputStr.Add('-');

        textBox1.AppendText("-");
    }

    private void button3_Click(object sender, EventArgs e)
    {

        //界面撤销
        try { inputStr.RemoveAt(inputStr.Count - 1); }
        catch(System.ArgumentOutOfRangeException)
        {
            textBox1.Text = ("输入错误");
        }
        

        textBox1.Text = "";
        for (int i = 0; i < inputStr.Count; i++)
        {
            textBox1.Text += inputStr[i];
        }
        
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }

    private void textBox2_TextChanged(object sender, EventArgs e)
    {

    }
}
class DataOp : 计算器
{
    //表达式存储在inputStr
    static Stack<double> m = new Stack<double>();//数字栈       
    static Stack<char> s = new Stack<char>();//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;
                    
                    try {n2 = m.Pop();n1 = m.Pop();s1 = s.Pop();
                    double sum = Operat(n1, n2, s1);
                    m.Push(sum);
                    s.Push(inputStr[i]); }
                    catch(System.InvalidOperationException)
                    {
                        MessageBox.Show("Error");


                    }
                    
                    
                }
            }
            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;
            
            try
            {
                n2 = m.Pop();
                n1 = m.Pop();
                s1 = s.Pop();
                sum = Operat(n1, n2, s1);
            }

             catch (System.InvalidOperationException)
           {
                MessageBox.Show("Error");
           }
            
          
            /*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       
    {
        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 '/': if (n2 == 0) { MessageBox.Show("Error"); } sum = n1 / n2; break;
        }
        return sum;
    }
    public static string DataMain()
    {            Read();
        return PopStack().ToString();
    }
}

}