How to replace 0 on pressing ON in a calculator

Question

0.00/5 (No votes)

See more:

I have made a calculator, it is working fine but there is a power button whose text is changed on clicking the button.First it is ON and 0 is written in the result text box. Now i want to replace it with the value on the click of the button, but it is not happening.
Please help me out with this.
There is code also for the convenience as:

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
    {
        
        Decimal Num1;
        Decimal Num2;
       
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {

                btn_power.Text = "ON";

                btn_power.BackColor = Color.Green;

                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;

             }
        }



        protected void btn_1_Click(object sender, EventArgs e)
        {
            txt_result.Text = txt_result.Text + 1;
           
        }

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

            }

        }



        protected void btn_divide_Click(object sender, EventArgs e)
        {
            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)
        {
            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)
        {
            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)
        {
            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_multiply.Enabled = true;
            btn_divide.Enabled = true;
            btn_equal.Enabled = true;
            btn_add.Enabled = true;
            btn_sub.Enabled = true;

            txt_result.Text = "0";
            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;

        }
       
    }
}

Please help me out ~~as it is urgent.~~

Posted 31-Jan-13 0:59am

Ravinder Kumar Sharma

Updated 31-Jan-13 2:02am

Abhishek Pant

v3

Add a Solution

Comments

Mike Meinz 31-Jan-13 7:44am

Please clarify what you mean.

You say Now I want to replace it with the value on the click of the button

What is "it"?
What is "the value"?
What is "the button"?

ZurdoDev 31-Jan-13 7:54am

Your description sounds very easy but there is lots of code. Can you simplify down what the problem is?

[no name] 31-Jan-13 8:08am

can you provide .aspx page code also..??

Ravinder Kumar Sharma 1-Feb-13 2:35am

Thanx, I am sending the aspx code as well as under:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="calculator.aspx.cs" Inherits="Calculator_full.calculator" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<link href="Calculator.css" rel="stylesheet" type="text/css" />

<style type="text/css">
.style2
{
margin-left: 4px;
}
.style3
{
margin-left: 0px;
}
.style4
{
background-color: Olive;
font-family: Arial;
font-size: 15px;
font-weight: bold;
color: Black;
}
.style5
{
background-color: red;
font-family: Arial;
font-size: 15px;
font-weight: bold;
color: Black;
}
.style6
{
background-color: Olive;
font-family: Arial;
font-size: 15px;
font-weight: bold;
color: Black;
margin-left: 0px;
}
.style7
{
background-color: gray;
border: solid 2px black;
font-family: Arial;
font-weight: bold;
color: black;
font-size: 16px;
vertical-align: middle;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<contenttemplate>

<table align="center" width="35%" style="border-left: 2px solid #00F; border-right: 2px solid #00F;
border-bottom: 2px solid #00F; border-top: 2px solid #00F;">
<tr>
<td colspan="6">

</td>
</tr>
<tr>
<td colspan="6" align="center">
<asp:TextBox ID="txt_result" runat="server" Style="text-align: right" Width="93%"
Height="30px" BorderColor="Black" BorderStyle="Groove" CssClass="style3" OnTextChanged="txt_result_TextChanged">
</td>
</tr>
<tr>
<td colspan="6">

</td>
</tr>
<tr>
<td colspan="2" width="33.33%" align="center">
<asp:Button ID="btn_clear" runat="server" CssClass="style6" Text="C" BorderColor="Black"
Font-Bold="True" Width="104px" OnClick="btn_clear_Click" />
</td>
<td colspan="2" width="33.33%" align="center">
<asp:Button ID="btn_clearall" runat="server" Text="CE" CssClass="style4" BorderColor="Black"
Font-Bold="True" Width="102px" OnClick="btn_clearall_Click" />
</td>
<td colspan="2" width="33.33%" align="center">
<asp:Button ID="btn_power" runat="server" Text="ON/OFF" CssClass="style5" BorderColor="Black"
Font-Bold="True" Width="108px" OnClick="btn_power_Click" />
</td>
</tr>
<tr>
<%--<td width = "33.33%" class="style1">
<asp:Button ID="btn_clear" runat="server" Text="C" BorderColor="Black" Font-Bold="True"
Width="55px" />
</td>

<td width="33.33%">
<asp:Button ID="btn_clearall" runat="server" Text="CE" BorderColor="Black" Font-Bold="True"
Width="60px" />

2 solutions

Solution 1

I think you need as below code...

C#

public static string str= "";
public static int count = 0;
protected void Button1_Click(object sender, EventArgs e)
{
    count++;
    if (count % 2 == 0)
        str = "On";
    else
        str = "Off";
    Button1.Text = str;
}

Thanks
If it helps you, plz dont forget to marks as solution and vote.
C#/Asp.Net Help[^]
Hemant Singh

Posted 31-Jan-13 2:09am

Hemant Singh Rautela

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

fjdiewornncalwe · Accepted Answer · 2013-01-31T04:39:00

Just a few hints here on making your code a little cleaner...

C#

protected void btn_power_Click(object sender, EventArgs e)
{
   bool isPowerTurningOn = (btn_power.Text == "OFF");

   // This will act as a toggle switch for the button text
   btn_power.Text = isPowerTurningOn ? "ON" : "OFF";
   btn_power.BackColor = isPowerTurningOn ? Color.Green : Color.Red;

   // Instead of calling each item in a separate line,
   // use a loop to make your life easier.
   foreach( var ctl in Controls )
   {
      if( ctl is Button )
      {
         ctl.Enabled = isPowerTurningOn;
      }
   } 
   
   txt_result.Text = isPowerTurningOn ? "0" : string.Empty;
   Session.Abandon();
 
}