VB.NET Log Example – Code Sample Syntax
VB.NET Log Example – Code Sample Syntax
Purpose: – Illustrates using VB.NET Log Code Example.
Purpose:
takes a double data type number and returns the natural
(base e) logarithm as a double data type.
Syntax:
Log(doublenumber)
Log(doublenumber)
Parameters | Description | doublenumber | Any valid System.Double data type number 1. Positive – returns natural logarithm 2. Zero – returns -Infinity 3. Negative – returns NaN (Not a Number) |
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Result Data Type | Description | double | the natural (base e) logarithm |
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Step 1: Click Visual Basic to Cut-n-paste code into clsLog.vb
Imports System.Math Public Class clsLog Public Sub Main() '******************************************************************************** ' Purpose: takes a double data type number and returns the natural ' (base e) logarithm as a double data type. ' ' ' Syntax: Log(doublenumber) ' ' Parameter1: doublenumber - Any valid System.Double data type number ' 1. Positive - returns natural logarithm ' 2. Zero - returns -Infinity ' 3. Negative - returns NaN (Not a Number) ' ' Result: double - the natural (base e) logarithm ' '******************************************************************************** ' This example is from http://idealprogrammer.com Console.WriteLine("Example #1: Log(doublenumber)") Console.WriteLine(Log(90)) ' Returns 4.49980967033027 'write blank line to make output easier to read Console.WriteLine() Console.WriteLine("Example #2: Log(doublenumber)") Console.WriteLine(Log(-3.4)) ' Returns NaN Not a Number 'write blank line to make output easier to read Console.WriteLine() Console.WriteLine("Example #3: Log(doublenumber)") Console.WriteLine(Log(0)) ' Returns -Infinity 'Prevent console from closing before you press enter Console.ReadLine() End Sub End Class |
Step 2: Click Visual Basic to Cut-n-paste code into Module1.vb
Module Module1 Sub Main() Dim myclsLog As New clsLog myclsLog.Main() End Sub End Module |
Prerequistes:
- Install Visual Basic (Express or Standard Edition)
- Install SQL Server Express
- Download Northwind and pubs Database
- Attach Northwind Database to Databases in Sql Express
- Attach pubs Database to Databases in Sql Express
Notes:
- Console Application is used to simplify things, but Windows Forms or Web Forms could also be used
- You can build a library of syntax examples by using same project over and over and just commenting out what you do not want to execute in Module1.vb
Instructions:
- Use Visual Basic 2010 Express or Standard Edition
- Create new project;
- Click File/New Project
- Select Console Application Template
- Select Visual Basic for Language
- name of project could be VBNET_Syntax.
- Add New folder named “Functions”
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: Functions
- Add New subfolder named “MathFunctions”
- Right-click Functions folder in solution explorer;
- add new folder;
- name of folder could be: MathFunctions
- Add Class Named clsLog to MathFunctions folder
- Right-click MathFunctions folder;
- add new item;
- Select class
- Class name could be clsLog
- Click on Visual Basic in code in step 1 above to copy code into clsLog.vb
- Click on Visual Basic in code in step 2 above to copy code into Module1.vb
- Click green arrow or press F5 to run program