using System;
using System.Drawing;
using System.Windows.Forms;
class calculator :Form
{
TextBox t;
Button b,b1,b2,b3,b4,b5,b6,b7,b8,b9,bp,bs,bm,bd,be,bc,ba,pi,sqr,dec;
bool clr=false;
bool deci=false;
decimal opd1,opd2;
string op;
int ope,op1,op2;


calculator()
{
ClientSize = new Size(155,173);
Text="CALCULATOR";

Label l4 =new Label();
l4.Text="CALCULATOR";
l4.Location=new Point(5,5);
l4.ForeColor=Color.Yellow;


t=new TextBox();
t.Location=new Point(5,20);
t.Size=new Size(150,20);

 b=new Button();
b.Text ="1";
b.Location = new Point(5,50);  
b.Click += new EventHandler(b_Click);
b.Size=new Size(30,30);



b1=new Button();
b1.Text ="2";
b1.Location = new Point(35,50);  
b1.Click += new EventHandler(b1_Click);
b1.Size=new Size(30,30);



 b2=new Button();
b2.Text="3";
b2.Location = new Point(65,50);
b2.Click += new EventHandler(b2_Click);
b2.Size=new Size(30,30);



b3=new Button();
b3.Text="4";
b3.Location = new Point(95,50); 
b3.Click += new EventHandler(b3_Click);
b3.Size=new Size(30,30);

 
 b4=new Button();
b4.Text="5";
b4.Location = new Point(125,50);  
b4.Click += new EventHandler(b4_Click);
b4.Size=new Size(30,30);



 b5=new Button();
b5.Text="6";
b5.Location = new Point(5,80);  
b5.Click += new EventHandler(b5_Click);
b5.Size=new Size(30,30);



 b6=new Button();
b6.Text="7";
b6.Location = new Point(35,80);  
b6.Click += new EventHandler(b6_Click);
b6.Size=new Size(30,30);



 b7=new Button();
b7.Text="8";
b7.Location = new Point(65,80);  
b7.Click += new EventHandler(b7_Click);
b7.Size=new Size(30,30);



 b8=new Button();
b8.Text="9";
b8.Location = new Point(95,80);  
b8.Click += new EventHandler(b8_Click);
b8.Size=new Size(30,30);



 b9=new Button();
b9.Text="0";
b9.Location = new Point(125,80);
b9.Click += new EventHandler(b9_Click);
b9.Size=new Size(30,30);

  

 bp=new Button();
bp.Text="+";
bp.Location = new Point(5,110);  
bp.Click += new EventHandler(bp_Click);
bp.Size=new Size(30,30);



bs=new Button();
bs.Text="-";
bs.Location = new Point(35,110);  
bs.Click += new EventHandler(bs_Click);
bs.Size=new Size(30,30);



bm=new Button();
bm.Text="*";
bm.Location = new Point(65,110);  
bm.Click += new EventHandler(bm_Click);
bm.Size=new Size(30,30);



 bd=new Button();
bd.Text="/";
bd.Location = new Point(95,110);  
bd.Click += new EventHandler(bd_Click);
bd.Size=new Size(30,30);


be=new Button();
be.Text="=";
be.Location = new Point(125,110); 
be.Click += new EventHandler(be_Click);
be.Size=new Size(30,30);


bc=new Button();
bc.Text="CLR";
bc.Location = new Point(5,140); 
bc.Click += new EventHandler(bc_Click);
bc.Size=new Size(30,30);


ba=new Button();
ba.Text="AC";
ba.Location = new Point(35,140); 
ba.Click += new EventHandler(ba_Click);
ba.Size=new Size(30,30);


pi=new Button();
pi.Text="pi";
pi.Location = new Point(65,140); 
pi.Click += new EventHandler(pi_Click);
pi.Size=new Size(30,30);


sqr=new Button();
sqr.Text="sqr";
sqr.Location = new Point(95,140); 
sqr.Click += new EventHandler(sqr_Click);
sqr.Size=new Size(30,30);



dec=new Button();
dec.Text=".";
dec.Location = new Point(125,140); 
dec.Click += new EventHandler(dec_Click);
dec.Size=new Size(30,30);
Controls.AddRange(new Control[]{
        t,b,b1,b2,b3,b4,b5,b6,b7,b7,b8,b9,bp,bs,bm,bd,be,bc,ba,pi,sqr,dec}
      );
    
}

private void b_Click(
       object sender, System.EventArgs e) {
                        
       if(clr==true)
       {
        t.Text=" ";
        clr=false;
        }
     t.AppendText(b.Text);
     }
private void b1_Click(
       object sender, System.EventArgs e) {
                         
      
         if(clr==true)
       {
        t.Text=" ";
        clr=false;
        }
          t.AppendText(b1.Text);

  }
private void b2_Click(
       object sender, System.EventArgs e) {
                        
         if(clr==true)
       {
        t.Text=" ";
        clr=false;
        }
    
       t.AppendText(b2.Text);
    }
private void b3_Click(
       object sender, System.EventArgs e) {
                           
         if(clr==true)
       {
        t.Text=" ";
        clr=false;
        }
      t.AppendText(b3.Text);
    
    }
private void b4_Click(
       object sender, System.EventArgs e) {
                         
   if(clr==true)
       {
        t.Text=" ";
        clr=false;
        }
      
     
       t.AppendText(b4.Text);
     
 
    }
    
private void b5_Click(
       object sender, System.EventArgs e) {
                          

   if(clr==true)
       {
        t.Text=" ";
        clr=false;
        }
      
    
       t.AppendText(b5.Text);
     
      


    }
private void b6_Click(
       object sender, System.EventArgs e) {
                     
   if(clr==true)
       {
        t.Text=" ";
        clr=false;
        }
      t.AppendText(b6.Text);
      }
private void b7_Click(
       object sender, System.EventArgs e) {
                       

   if(clr==true)
       {
        t.Text=" ";
        clr=false;
        }
      
     
       t.AppendText(b7.Text);
     

    }
private void b8_Click(
       object sender, System.EventArgs e) {
                         
   if(clr==true)
       {
        t.Text=" ";
        clr=false;
        }
      
   
       t.AppendText(b8.Text);
    



    }
private void b9_Click(
       object sender, System.EventArgs e) {
                         
   if(clr==true)
       {
        t.Text=" ";
        clr=false;
        }
      t.AppendText(b9.Text);
  
 


    }
private void bp_Click(
       object sender, System.EventArgs e) {
       
     op="+";
     
     if(deci!=true)
     {
      op1=Int32.Parse(t.Text);
     
      }
      else
      {
      opd1=Convert.ToDecimal(t.Text);
      Console.WriteLine(opd1);
      }
        t.Text=" ";

      
    }
private void bs_Click(
       object sender, System.EventArgs e) {
    op="-";
     if(deci!=true)
     {
      op1=Int32.Parse(t.Text);
     
      }
      else
      {
      opd1=Convert.ToDecimal(t.Text);
      Console.WriteLine(opd1);
      }

    
    t.Text=" ";
    }
private void bm_Click(
       object sender, System.EventArgs e) {
     
      op="*";
      if(deci!=true)
     {
      op1=Int32.Parse(t.Text);
     
      }
      else
      {
      opd1=Convert.ToDecimal(t.Text);
      Console.WriteLine(opd1);
      }

      t.Text=" ";

    }
private void bd_Click(
       object sender, System.EventArgs e) {
  
      op="/";
      if(deci!=true)
     {
      op1=Int32.Parse(t.Text);
     
      }
      else
      {
      opd1=Convert.ToDecimal(t.Text);
      Console.WriteLine(opd1);
      }

      t.Text=" ";
          
    }

private void be_Click(
       object sender, System.EventArgs e) 
       {
       
       if(deci!=true)
       {
        op2=Int32.Parse(t.Text);
        cal(op);
        }
        else
        {
        opd2=Convert.ToDecimal(t.Text);
        cal(op);
        }
       
     
    }
private void bc_Click(
       object sender, System.EventArgs e) {
                  clr=true;      
                         t.Text="0";
      
}

private void ba_Click(
       object sender, System.EventArgs e) {
                        clr=true;
                         t.Text="0";
      
}
private void pi_Click(
       object sender, System.EventArgs e) {
                        
                         t.Text="3.14";
                         
                         }

private void sqr_Click(
       object sender, System.EventArgs e)
        {
         int s;
         Decimal s1;
         if(deci!=true)
         {
         s=Int32.Parse(t.Text);
         s=s*s;
         t.Text=s.ToString();
         }
         else
         {
         s1=Convert.ToDecimal(t.Text);
         s1= s1 * s1;
         t.Text=s1.ToString();
         }
        
        }
 
 private void dec_Click(
       object sender, System.EventArgs e) {
                      
                      t.AppendText(".");  
                      deci=true; 
                }



void cal(string s)
{
Decimal opd3;
switch(s)
{
case "+":if(deci!=true)
		 {
         ope=op1+op2;
         t.Text=ope.ToString();
         }
         else
         {
         opd3=opd1 + opd2;
         t.Text=opd3.ToString();
         }
       
         
         op=" ";
         break;
case "-":if(deci!=true)
		 {
         ope=op1-op2;
         t.Text=ope.ToString();
        

         }
         else
         {
         opd3=opd1 - opd2;
         t.Text=opd3.ToString();
         }
       

        op=" ";
        break;
case "*":if(deci!=true)
		 {
         ope=op1*op2;
         t.Text=ope.ToString();
       

         }
         else
         {
         opd3=opd1 * opd2;
         t.Text=opd3.ToString();
         }
       

          op=" ";
         break;
case "/":
        if(deci!=true)
		 {
		 try
		 {
         ope=op1 / op2;
         }
         catch(DivideByZeroException de)
         {
          Console.Write("divide by zero erroe");
         }
         finally
         {
         Console.WriteLine("finally");
         }
         
         t.Text=ope.ToString();
        

         }
         else
         {
         opd3=opd1 / opd2;
         t.Text=opd3.ToString();
         }
       
         op=" ";
          break;
}

}
public static void Main()
 {
Application.Run(new calculator());
}
}