I want to overwrite 0 with any other value in calculator on pressing on

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I am making a calculator. It is working fine but when i press on it gives 0 and after it pressing of any digit leads to the value but followed by zero.
I want to overwrite the value on zero on any of the button click on calculator,
Please help me out, its urgent, in addition i am pasting the code here, please do the necessary corrections and send back the code.

Calculator:

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
namespace Calculator_full
{
    public partial class calculator : System.Web.UI.Page
    {
        //float a;
        //float b;
        //float c;
        //bool plus = false;
        //bool minus = false;
        //bool multiply = false;
        //bool divide = false;
        Decimal Num1;
        Decimal Num2;
       // string Symbol;

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                
                btn_power.Text = "ON";

                btn_power.BackColor = Color.Green;


                //btn_0.Enabled = true;
                //btn_1.Enabled = true;
                //btn_2.Enabled = true;
                //btn_3.Enabled = true;
                //btn_4.Enabled = true;
                //btn_5.Enabled = true;
                //btn_6.Enabled = true;
                //btn_7.Enabled = true;
                //btn_8.Enabled = true;
                //btn_9.Enabled = true;
                //btn_clear.Enabled = true;
                //btn_clearall.Enabled = true;
                //btn_power.Enabled = true;
                //btn_multiply.Enabled = true;
                //btn_divide.Enabled = true;
                //btn_equal.Enabled = true;
                //btn_add.Enabled = true;
                //btn_sub.Enabled = true;

                btn_0.Enabled = false;
                btn_1.Enabled = false;
                btn_2.Enabled = false;
                btn_3.Enabled = false;
                btn_4.Enabled = false;
                btn_5.Enabled = false;
                btn_6.Enabled = false;
                btn_7.Enabled = false;
                btn_8.Enabled = false;
                btn_9.Enabled = false;
                btn_clear.Enabled = false;
                btn_clearall.Enabled = false;
                btn_multiply.Enabled = false;
                btn_divide.Enabled = false;
                btn_equal.Enabled = false;
                btn_add.Enabled = false;
                btn_sub.Enabled = false;

               // txt_result.Text = txt_result.Text + btn_0.Text;
            }
        }



        protected void btn_1_Click(object sender, EventArgs e)
        {
            //txt_result.Text = txt_result.Text + btn_1.Text;

            txt_result.Text = txt_result.Text + 1;
            //Num1 = Convert.ToInt32(txt_result.Text);

        }

        protected void btn_8_Click(object sender, EventArgs e)
        {
            txt_result.Text = txt_result.Text + btn_8.Text;
        }

        protected void btn_2_Click(object sender, EventArgs e)
        {
            //txt_result.Text = txt_result.Text + btn_2.Text;
            txt_result.Text = txt_result.Text + 2;
        }

        protected void btn_3_Click(object sender, EventArgs e)
        {
            txt_result.Text = txt_result.Text + btn_3.Text;
        }

        protected void btn_4_Click(object sender, EventArgs e)
        {
            txt_result.Text = txt_result.Text + btn_4.Text;
        }

        protected void btn_5_Click(object sender, EventArgs e)
        {
            txt_result.Text = txt_result.Text + btn_5.Text;
        }

        protected void btn_6_Click(object sender, EventArgs e)
        {
            txt_result.Text = txt_result.Text + btn_6.Text;
        }

        protected void btn_7_Click(object sender, EventArgs e)
        {
            txt_result.Text = txt_result.Text + btn_7.Text;
        }

        protected void btn_9_Click(object sender, EventArgs e)
        {
            txt_result.Text = txt_result.Text + btn_9.Text;
        }

        protected void btn_0_Click(object sender, EventArgs e)
        {
            txt_result.Text = txt_result.Text + btn_0.Text;
        }

        protected void btn_add_Click(object sender, EventArgs e)
        {
            //txt_result.Text = txt_result.Text + btn_add.Text; 
            //a = Convert.ToInt32(txt_result.Text);
            //// txt_result.Text = "";
            //txt_result.Text += btn_add.Text;
            //plus = true;

            Num1 = Convert.ToDecimal(txt_result.Text);
            Session["first"] = Num1;
            Session["Func"] = "ADD";
            txt_result.Text = string.Empty;
        }

        protected void btn_equal_Click(object sender, EventArgs e)
        {
            //b = Convert.ToInt32(txt_result.Text);
            //if (plus == true)
            //{
            //    c = Convert.ToInt32(txt_result.Text);
            //    txt_result.Text = Convert.ToString(c);
            //}
            //else if (minus == true)
            //{
            //    c = a - b;
            //    txt_result.Text = Convert.ToString(c);
            //}
            //else if (multiply == true)
            //{
            //    c = a * b;
            //    txt_result.Text = Convert.ToString(c);
            //}
            //else if (divide == true)
            //{
            //    c = a / b;
            //    txt_result.Text = Convert.ToString(c);
            //}
            //else
            //{
            //    txt_result.Text = "";
            //}

            Num2 = Convert.ToDecimal(txt_result.Text);
            if (Session["Func"].ToString() == "ADD")
            {
                decimal res = 0;
                //txt_result.Text = Convert.ToString(Convert.ToDecimal(Session["First"]) + Num2);
                res = Convert.ToDecimal(Session["First"]) + Num2;
                txt_result.Text = String.Format("{0:0.########}", res);
            }
            else if (Session["Func"].ToString() == "SUB")
            {
                decimal res = 0;
                res = Convert.ToDecimal(Session["First"]) - Num2;
                txt_result.Text = String.Format("{0:0.########}", res);
            }
            else if (Session["Func"].ToString() == "DIV")
            {
                //txt_result.Text = Convert.ToString(Convert.ToDecimal(Session["First"]) / Num2);
                decimal res = 0;
                res = Convert.ToDecimal(Session["First"]) / Num2;
                txt_result.Text = String.Format("{0:0.########}", res);
            }
            else if (Session["Func"].ToString() == "MUL")
            {
                //txt_result.Text = Convert.ToString(Convert.ToDecimal(Session["First"]) * Num2);
                decimal res = 0;
                res = Convert.ToDecimal(Session["First"]) * Num2;
                txt_result.Text = String.Format("{0:0.########}", res);

            }

            //else if (Symbol == "*")
            //{
            //    txt_result.Text = Num1 * Num2;
            //}
            //else if (Symbol == "/")   
            //{
            //    txt_result.Text = Num1 / Num2;
            //}


        }

    

        protected void btn_divide_Click(object sender, EventArgs e)
        {
            ////txt_result.Text = txt_result.Text + btn_divide.Text; 
            //a = Convert.ToInt32(txt_result.Text);
            //txt_result.Text = "";
            //divide = true;
            Num1 = Convert.ToDecimal(txt_result.Text);
            Session["first"] = Num1;
            Session["Func"] = "DIV";
            txt_result.Text = string.Empty;
        }

        protected void btn_multiply_Click(object sender, EventArgs e)
        {
            ////txt_result.Text = txt_result.Text + btn_multiply.Text; 
            //a = Convert.ToInt32(txt_result.Text);
            //txt_result.Text = "";
            //multiply = true;
            Num1 = Convert.ToDecimal(txt_result.Text);
            Session["first"] = Num1;
            Session["Func"] = "MUL";
            txt_result.Text = string.Empty;
        }

        protected void btn_sub_Click(object sender, EventArgs e)
        {
            ////txt_result.Text = txt_result.Text + btn_sub.Text; 
            //a = Convert.ToInt32(txt_result.Text);
            //txt_result.Text = "";
            //minus = true;

            Num1 = Convert.ToDecimal(txt_result.Text);
            Session["first"] = Num1;
            Session["Func"] = "SUB";
            txt_result.Text = string.Empty;
        }

        protected void btn_clear_Click(object sender, EventArgs e)
        {
            clearall();
        }

        protected void btn_clearall_Click(object sender, EventArgs e)
        {
            clearall();
        }

        protected void btn_power_Click(object sender, EventArgs e)
        {
            //if (txt_result.Text = txt_result.Text,
            //    txt_result.Text = txt_result.Text + btn_0.Text);
            //else txt_result.Text = "";
            btn_power.Text = "OFF";
            btn_power.BackColor = Color.Red;



            btn_0.Enabled = true;
            btn_1.Enabled = true;
            btn_2.Enabled = true;
            btn_3.Enabled = true;
            btn_4.Enabled = true;
            btn_5.Enabled = true;
            btn_6.Enabled = true;
            btn_7.Enabled = true;
            btn_8.Enabled = true;
            btn_9.Enabled = true;
            btn_clear.Enabled = true;
            btn_clearall.Enabled = true;
            //btn_power.Enabled = true;
            btn_multiply.Enabled = true;
            btn_divide.Enabled = true;
            btn_equal.Enabled = true;
            btn_add.Enabled = true;
            btn_sub.Enabled = true;

            //btn_0.Enabled = false;
            //btn_1.Enabled = false;
            //btn_2.Enabled = false;
            //btn_3.Enabled = false;
            //btn_4.Enabled = false;
            //btn_5.Enabled = false;
            //btn_6.Enabled = false;
            //btn_7.Enabled = false;
            //btn_8.Enabled = false;
            //btn_9.Enabled = false;
            //btn_clear.Enabled = false;
            //btn_clearall.Enabled = false;

            //btn_multiply.Enabled = false;
            //btn_divide.Enabled = false;
            //btn_equal.Enabled = false;
            //btn_add.Enabled = false;
            //btn_sub.Enabled = false;

            //txt_result.Text = "";
            //a = 0;
            //b = 0;
            //c = 0;
            //plus = false;
            //minus = false;
            //multiply = false;
            //divide = false;


           txt_result.Text = txt_result.Text + btn_0.Text ;
         

            Session.Abandon();

        }

        public void clearall()
        {
            txt_result.Text = "";
        }

        protected void txt_result_TextChanged(object sender, EventArgs e)
        {
            
        }

        protected void btn_decimal_Click(object sender, EventArgs e)
        {
            txt_result.Text = txt_result.Text + btn_decimal.Text;
        }
        //public override string txt_result.text;
        //{
        //    get { return txt_result.Text.Replace(",", ""); }
        //    set { txt_result.Text = value; }
        //}
    }

Posted 30-Jan-13 23:35pm

Ravinder Kumar Sharma

Updated 30-Jan-13 23:39pm

Joezer BH

v2

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4 solutions

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Vijayavel Nadar · Answer 1 · 2013-01-30T23:43:00

Solution 1

Change the following code

C#

protected void btn_decimal_Click(object sender, EventArgs e)
{
txt_result.Text = txt_result.Text + btn_decimal.Text;
}

to

C#

protected void btn_decimal_Click(object sender, EventArgs e)
{
if(txt_result.Text=="0")
{
   txt_result.Text = btn_decimal.Text;
}
else
{
   txt_result.Text = txt_result.Text + btn_decimal.Text;
}
}

Posted 30-Jan-13 23:43pm

Vijayavel Nadar

Comments

Ravinder Kumar Sharma 31-Jan-13 6:24am

Please read the code carefully and then understand the help that I need.

I want that there is zero in the result textbox when I press ON.
After this I want that now the value that goes in the textbox must replace 0 that we get on pressing ON and on the same button the text is changed i.e. afer pressing ON the text on the same button changes to Off. So, i want clear textbox on pressing OFF, Please help me out.

T Pat · Answer 2 · 2013-01-30T23:51:00

Why don't you try checking the length of the result text as well as its value.
Try the following modification on button click it might solve your problem

C#

protected void btn_1_Click(object sender, EventArgs e)
        {
            //txt_result.Text = txt_result.Text + btn_1.Text;
            if(txt_result.Text.length == 1 && txt_result.Text == "0")
            {
               txt_result.Text = "1";
            }
            else
            {
               txt_result.Text = txt_result.Text + 1;
               //Num1 = Convert.ToInt32(txt_result.Text);
            }
        }

Vijayavel Nadar · Answer 3 · 2013-02-04T03:47:00

Well..in this case you can just have one event for all your number text boxes or you can replace all the button event code as below whereever applicable

C#

protected void numberbutton_Click(object sender, EventArgs e)
 {
  if(txt_result.Text=="0")
   {
    txt_result.Text = sender.Text;
   }
 else
 {
   txt_result.Text = txt_result.Text + sender.Text;
 }
}

Typecase the sender to button if required.

Trics071 · Answer 4 · 2013-01-30T23:55:00

Solution 3

JUST WRITE THE FOLLOWING CODE IT WILL WORK FINE..........

1.CHOOSE YOUR EVENT LIKE PAGE LOAD,TEXTCHANGED,BUTTON CLICK WHICH IS RIGHT 4 U
2. (I HAVE TAKEN TEXT CHANGED EVENT)
3.
PUT THE CODE
if ( TextBox1.Text.StartsWith(Convert.ToString(0)))
{
TextBox1.Text = TextBox1.Text.Remove(0,1);

}

Posted 30-Jan-13 23:55pm

Trics071

Comments

clivethescott 10-Feb-13 17:03pm

why call Convert.ToString(0) when you can just use the string "0". And calling Remove and then eventually inserting the pressed button text looks like doing double the job

I want to overwrite 0 with any other value in calculator on pressing on

4 solutions

Solution 1

Solution 2

Solution 4

Solution 3

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