Here is a procedure to create a basic calculator. In this section I will build a basic calculator that can perform the following operations:
- Addition
- Subtraction
- Multiplication
- Division
- Clear
Steps:
Open Microsoft Visual Studio 2010 then click on "File" -> "New" -> "Website".
Then select "ASP.NET Empty Website".
Then "Add New Item":
Then select "Web Form":
And click "Add". Now it will open the page as in the following:
Here we will write our code:.
Process to create calculator
First we need to create a TextBox and 16 Buttons as in the following:
- 10 Buttons for numbers (0-9)
- 5 Buttons to perform operation (addition (+), Subtraction (-) , Multiplication (*), Division (/) ,Clear (CLR) )
- 1 Buttons for evaluation (=)
Here is the code for the "Default.aspx" page:
- <html xmlns="http://www.w3.org/1999/xhtml">
- <head id="Head1" runat="server">
- <title></title>
- <style type="text/css">
- .cal
- {
- position:absolute;
- top:50px;
- left:150px;
- right:400px;
- height:500px;
- bottom:100px;
- background-color:Teal;
- }
- </style>
- </head>
- <body>
- <form id="form1" runat="server">
- <div class="cal">
- <asp:Label ID="l" Text=" BASIC CALCULATOR" runat="server" Style="margin-left: 200px"
- Font-Bold="False" Font-Italic="False"></asp:Label>
- <asp:TextBox ID="t" runat="server" Style="margin-left: 100px; margin-top: 24px;"
- Width="335px" Height="41px"></asp:TextBox>
- <asp:Button ID="b1" Text="1" runat="server" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="b1_Click" />
- <asp:Button ID="b2" Text="2" runat="server" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="b2_Click" />
- <asp:Button ID="b3" Text="3" runat="server" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="b3_Click" />
- <asp:Button ID="add" Text="+" runat="server" Height="37px" Style="margin-left: 0px;
- margin-top: 0px;" Width="57px" OnClick="add_Click" />
- <asp:Button ID="b4" Text="4" runat="server" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="b4_Click" />
- <asp:Button ID="b5" Text="5" runat="server" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="b5_Click" />
- <asp:Button ID="b6" Text="6" runat="server" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="b6_Click" />
- <asp:Button ID="sub" Text="-" runat="server" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="sub_Click" />
- <asp:Button ID="b7" Text="7" runat="server" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="b7_Click" />
- <asp:Button ID="b8" Text="8" runat="server" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="b8_Click" />
- <asp:Button ID="b9" Text="9" runat="server" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="b9_Click" />
- <asp:Button ID="mul" Text="*" runat="server" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="mul_Click" />
- <asp:Button ID="b0" runat="server" Text="0" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="b0_Click" />
- <asp:Button ID="clr" runat="server" Text="CLR" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="clr_Click" />
- <asp:Button ID="eql" runat="server" Text="=" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="eql_Click" />
- <asp:Button ID="div" Text="/" runat="server" Height="37px" Style="margin-left: 0px"
- Width="57px" OnClick="div_Click" />
- </div>
- </form>
- </body>
- </html>
Here is the code for the "Default.aspx.cs" page (the code for all the buttons) :
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Web;
- using System.Web.UI;
- using System.Web.UI.WebControls;
- public partial class _Default : System.Web.UI.Page
- {
- static float a, c, d;
- static char b;
- protected void Page_Load(object sender, EventArgs e)
- {
- }
- protected void b1_Click(object sender, EventArgs e)
- {
- if ((t.Text == "+") || (t.Text == "-") || (t.Text == "*") || (t.Text == "/"))
- {
- t.Text = "";
- t.Text = t.Text + b1.Text;
- }
- else
- t.Text = t.Text + b1.Text;
- }
- protected void b2_Click(object sender, EventArgs e)
- {
- if ((t.Text == "+") || (t.Text == "-") || (t.Text == "*") || (t.Text == "/"))
- {
- t.Text = "";
- t.Text = t.Text + b2.Text;
- }
- else
- t.Text = t.Text + b2.Text;
- }
- protected void b3_Click(object sender, EventArgs e)
- {
- if ((t.Text == "+") || (t.Text == "-") || (t.Text == "*") || (t.Text == "/"))
- {
- t.Text = "";
- t.Text = t.Text + b3.Text;
- }
- else
- t.Text = t.Text + b3.Text;
- }
- protected void b4_Click(object sender, EventArgs e)
- {
- if ((t.Text == "+") || (t.Text == "-") || (t.Text == "*") || (t.Text == "/"))
- {
- t.Text = "";
- t.Text = t.Text + b4.Text;
- }
- else
- t.Text = t.Text + b4.Text;
- }
- protected void b5_Click(object sender, EventArgs e)
- {
- if ((t.Text == "+") || (t.Text == "-") || (t.Text == "*") || (t.Text == "/"))
- {
- t.Text = "";
- t.Text = t.Text + b5.Text;
- }
- else
- t.Text = t.Text + b5.Text;
- }
- protected void b6_Click(object sender, EventArgs e)
- {
- if ((t.Text == "+") || (t.Text == "-") || (t.Text == "*") || (t.Text == "/"))
- {
- t.Text = "";
- t.Text = t.Text + b6.Text;
- }
- else
- t.Text = t.Text + b5.Text;
- }
- protected void b7_Click(object sender, EventArgs e)
- {
- if ((t.Text == "+") || (t.Text == "-") || (t.Text == "*") || (t.Text == "/"))
- {
- t.Text = "";
- t.Text = t.Text + b7.Text;
- }
- else
- t.Text = t.Text + b7.Text;
- }
- protected void b8_Click(object sender, EventArgs e)
- {
- if ((t.Text == "+") || (t.Text == "-") || (t.Text == "*") || (t.Text == "/"))
- {
- t.Text = "";
- t.Text = t.Text + b8.Text;
- }
- else
- t.Text = t.Text + b8.Text;
- }
- protected void b9_Click(object sender, EventArgs e)
- {
- if ((t.Text == "+") || (t.Text == "-") || (t.Text == "*") || (t.Text == "/"))
- {
- t.Text = "";
- t.Text = t.Text + b9.Text;
- }
- else
- t.Text = t.Text + b9.Text;
- }
- protected void b0_Click(object sender, EventArgs e)
- {
- if ((t.Text == "+") || (t.Text == "-") || (t.Text == "*") || (t.Text == "/"))
- {
- t.Text = "";
- t.Text = t.Text + b0.Text;
- }
- else
- t.Text = t.Text + b0.Text;
- }
- protected void add_Click(object sender, EventArgs e)
- {
- a = Convert.ToInt32(t.Text);
- t.Text = "";
- b = '+';
- t.Text += b;
- }
- protected void sub_Click(object sender, EventArgs e)
- {
- a = Convert.ToInt32(t.Text);
- t.Text = "";
- b = '-';
- t.Text += b;
- }
- protected void mul_Click(object sender, EventArgs e)
- {
- a = Convert.ToInt32(t.Text);
- t.Text = "";
- b = '*';
- t.Text += b;
- }
- protected void div_Click(object sender, EventArgs e)
- {
- a = Convert.ToInt32(t.Text);
- t.Text = "";
- b = '/';
- t.Text += b;
- }
- protected void eql_Click(object sender, EventArgs e)
- {
- c = Convert.ToInt32(t.Text);
- t.Text = "";
- if (b == '/')
- {
- d = a / c;
- t.Text += d;
- a = d;
- }
- else if (b == '+')
- {
- d = a + c;
- t.Text += d;
- a = d;
- }
- else if (b == '-')
- {
- d = a - c;
- t.Text += d;
- a = d;
- }
- else
- {
- d = a * c;
- t.Text += d;
- a = d;
- }
- }
- protected void clr_Click(object sender, EventArgs e)
- {
- t.Text = "";
- }
- }
The final output looks as in the following: