Log10 Example Syntax VB.NET ASP.NET | Log10 | Source Code

Posted by on Saturday, May 14, 2011 · Leave a Comment 

Log10 Example Syntax VB.NET ASP.NET | Log10 | Source Code

Summary: – Illustrates using with in VB.NET ASP.NET.


View Other VB.NET ASP.NET Source Code Examples


Purpose:
takes a double data type number and returns the base 10
logarithm as a double data type.

Syntax:
Log10(doublenumber)

Parameters Description
doublenumber Any valid System.Double data type number
1. Positive – returns base 10 logarithm of the input parameter
2. Zero – returns -Negative Infinity
3. Negative – returns NaN (Not a Number)

Result Data Type Description
double returns the base 10 logarithm of the input parameter

Quick Example
Log10(100) ‘ Returns 2

Step 1: Click on Visual Basic to Cut-n-paste code into Log10.aspx.vb

 
Imports System
Imports System.IO
Imports System.Data
Imports System.Math
 
'********************************************************************************
' Purpose: takes a double data type number and returns the base 10
' logarithm as a double data type.
'
'
' Syntax: 	Log10(doublenumber)
'
' Parameter1: doublenumber - Any valid System.Double data type number
' 1. Positive - returns base 10 logarithm of the input parameter
' 2. Zero - returns -Negative Infinity
' 3. Negative - returns NaN (Not a Number)
'
' Result: double - returns the base 10 logarithm of the input parameter
'
' Quick Example: Log10(100) ' Returns 2
'
'********************************************************************************
' This example is from http://idealprogrammer.com
 
 
 
Partial Class _Log10
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
 
 
        Label1.Text = "Example #1: 	Log10(doublenumber)"
 
 
        TextBox1.Text = String.Format("Log10(100) = {0}", Log10(100)) ' Returns 2
 
 
        Label2.Text = "Example #2: 	Log10(doublenumber)"
 
 
        TextBox2.Text = String.Format("Log10(1000) = {0}", Log10(1000)) ' Returns 3
 
 
        Label3.Text = "Example #3: 	Log10(doublenumber)"
 
 
 
 
        TextBox3.Text = String.Format("Log10(0) = {0}", Log10(0)) ' Returns -Infinity
 
 
    End Sub
End Class

Step 2: Click on XML to Cut-n-paste code into Log10.aspx

< %@ Page Language="VB" AutoEventWireup="false" CodeFile="Log10.aspx.vb" Inherits="_Log10" %>
 
< !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>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h1><asp:label ID="Label1" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox1" runat="server"></asp:textbox><br />
          <h1><asp:label ID="Label2" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox2" runat="server"></asp:textbox><br />
          <h1><asp:label ID="Label3" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox3" runat="server"></asp:textbox><br />
 
 
 
    </div>
    </form>
</body>
</html>

Prerequistes:

  1. Install Visual Web Developer 2010
  2. Install SQL Server Express
  3. Download Northwind and Pubs Databases
  4. Attach Northwind Database to Databases in Sql Express
  5. Attach pubs Database to Databases in Sql Express

Notes:

  • You can build your own library of syntax examples by using same web site over and over and just add new web forms to it.

Instructions:

VB.NET ASP.NET Syntax Functions MathFunctions Log10
  1. Use Visual Web Developer 2010
  2. Create new web site;
    • Click File/New Web Site
    • Select ASP.NET Website Template
    • Select Visual Basic for Language
    • name of Web Site could be VBNET_ASPNET_Syntax.
  3. Add New folder named “Functions”
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: Functions
  4. Add New subfolder named “MathFunctions”
    • Right-click Functions folder in solution explorer;
    • add new folder;
    • name of folder could be: MathFunctions
  5. Add Web Form Named Log10 to MathFunctions folder
    • Right-click MathFunctions folder;
    • add new item;
    • Select Web Form
    • Check place code behind in separate file
    • Web Form name could be Log10
  6. Click on Visual Basic in step 1 at the top of this page to copy code into code-behind Log10.aspx.vb
  7. Click on XML in step 2 above to copy code into web form Log10.aspx
  8. Right-click on Log10.aspx in solution explorer and select view in browser

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