Please help !! Urgent !!

hi all ,

how are you Hope everything is OK ..

I have this calculator program that is written in C++ language ...

what i need to do is to make some changes on the code of the program to make it not reliable but still Functional ..

In other words, the program will execute without error !! 100% executable ... but it will not be reliable ...

an example of that , maybe the program will take a long time (5 seconds for example) to give you this square root of 4 .... so we can say that the program is not reliable but still functional ..

plz guys !! i need this .... plz help !! waiting for your comments ..

This is the code :

<PRE>using System;
using System.Windows.Forms;
using System.Drawing;

public class win:Form {

Button[] b = new Button[10];
Button bDot,bPlus,bSub,bMul,bDiv,bEqu,bClr;
Panel panCalc;
TextBox txtCalc;

Double dblAcc;
Double dblSec;
bool blnClear,blnFrstOpen;
String strOper;

public win() {
try {
this.Text="Calculator";
panCalc=new Panel();
txtCalc = new TextBox();

txtCalc.Location = new Point(10,10);
txtCalc.Size=new Size(150,10);
txtCalc.ReadOnly=true;
txtCalc.RightToLeft=RightToLeft.Yes;
panCalc.Size=new Size(200,200);
panCalc.BackColor=Color.Aqua;
panCalc.Controls.Add(txtCalc);
addButtons(panCalc);
this.Size=new Size(200,225);
this.Controls.Add(panCalc);

dblAcc=0;
dblSec=0;
blnFrstOpen=true;
blnClear=false;
strOper=new String('=',1);
}
catch (Exception e) {
Console.WriteLine("error ...... " + e.StackTrace);
}
}

private void addButtons(Panel p) {
for (int i=0;i<=9;i++) {
b=new Button();
b.Text=Convert.ToString(i);
b.Size=new Size(25,25);
b.BackColor=Color.White;
b.Click+=new EventHandler(btn_clk);
p.Controls.Add(b);
}
b[0].Location=new Point(10,160);
b[1].Location=new Point(10,120);
b[4].Location=new Point(10,80);
b[7].Location=new Point(10,40);

b[2].Location=new Point(50,120);
b[5].Location=new Point(50,80);
b.Location=new Point(50,40);

b[3].Location=new Point(90,120);
b.Location=new Point(90,80);
b[9].Location=new Point(90,40);

bDot=new Button();
bDot.Size=new Size(25,25);
bDot.Location=new Point(50,160);
bDot.BackColor=Color.White;
bDot.Text=".";
bDot.Click+=new EventHandler(btn_clk);

bPlus=new Button();
bPlus.Size=new Size(25,25);
bPlus.Location=new Point(130,160);
bPlus.BackColor=Color.White;
bPlus.Text="+";
bPlus.Click+=new EventHandler(btn_Oper);

bSub=new Button();
bSub.Size=new Size(25,25);
bSub.Location=new Point(130,120);
bSub.BackColor=Color.White;
bSub.Text="-";
bSub.Click+=new EventHandler(btn_Oper);

bMul=new Button();
bMul.Size=new Size(25,25);
bMul.Location=new Point(130,80);
bMul.BackColor=Color.White;
bMul.Text="*";
bMul.Click+=new EventHandler(btn_Oper);

bDiv=new Button();
bDiv.Size=new Size(25,25);
bDiv.Location=new Point(130,40);
bDiv.BackColor=Color.White;
bDiv.Text="/";
bDiv.Click+=new EventHandler(btn_Oper);

bEqu=new Button();
bEqu.Size=new Size(25,25);
bEqu.Location=new Point(90,160);
bEqu.BackColor=Color.White;
bEqu.Text="=";
bEqu.Click+=new EventHandler(btn_equ);

bClr=new Button();
bClr.Size=new Size(20,45);
bClr.Location=new Point(170,40);
bClr.BackColor=Color.Orange;
bClr.Text="AC";
bClr.Click+=new EventHandler(btn_clr);

p.Controls.Add(bDot);
p.Controls.Add(bPlus);
p.Controls.Add(bSub);
p.Controls.Add(bMul);
p.Controls.Add(bDiv);
p.Controls.Add(bEqu);
p.Controls.Add(bClr);
}

private void btn_clk(object obj,EventArgs ea) {
if(blnClear)
txtCalc.Text="";

Button b3=(Button)obj;

txtCalc.Text+=b3.Text;

if (txtCalc.Text==".")
txtCalc.Text="0.";
dblSec=Convert.ToDouble(txtCalc.Text);

blnClear=false;
}

private static void Main() {
Application.Run(new win());
}

private void btn_Oper(object obj,EventArgs ea) {
Button tmp=(Button)obj;
strOper=tmp.Text;
if (blnFrstOpen)
dblAcc=dblSec;
else
calc();

blnFrstOpen=false;
blnClear=true;
}

private void btn_clr(object obj,EventArgs ea) {
clear();
}

private void btn_equ(object obj,EventArgs ea) {
calc();

}

private void calc() {

switch(strOper) {

case "+":
dblAcc+=dblSec;
break;
case "-":
dblAcc-=dblSec;
break;
case "*":
dblAcc*=dblSec;
break;
case "/":
dblAcc/=dblSec;
break;
}

strOper="=";
blnFrstOpen=true;
txtCalc.Text=Convert.ToString(dblAcc);
dblSec=dblAcc;
}

private void clear() {
dblAcc=0;
dblSec=0;
blnFrstOpen=true;
txtCalc.Text="";
txtCalc.Focus();

}
}</PRE>

SAM