C-Sharp Log Example – Code Sample Syntax
C-Sharp Log Example – Code Sample Syntax
Purpose: – Illustrates using C-Sharp 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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Quick Example | Log(90) // Returns 4.49980967033027 |
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Step 1: Click cs to Cut-n-paste code into clsLog.cs
using System; public class clsLog { public void 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 // // Quick Example: Log(90) // Returns 4.49980967033027 // //******************************************************************************** // This example is from http://idealprogrammer.com Console.WriteLine("Example #1: Log(90)"); Console.WriteLine(Math.Log(90)); // Returns 4.49980967033027 //write blank line to make output easier to read Console.WriteLine(); Console.WriteLine("Example #2: Log(-3.4)"); Console.WriteLine(Math.Log(-3.4)); // Returns NaN Not a Number //write blank line to make output easier to read Console.WriteLine(); Console.WriteLine("Example #3: Log(0)"); Console.WriteLine(Math.Log(0)); // Returns -Infinity //Prevent console from closing before you press enter Console.ReadLine(); } } |
Step 2: Click cs to Cut-n-paste code into Module1.cs
Module Module1 Sub Main() Dim myclsLog As New clsLog myclsLog.Main() End Sub End Module |
Prerequistes:
- Install C-Sharp (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.cs
Instructions:
- Use C-Sharp 2010 Express or Standard Edition
- Create new project;
- Click File/New Project
- Select Console Application Template
- Select C-Sharp for Language
- name of project could be C-Sharp_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 cs in code in step 1 above to copy code into clsLog.cs
- Click on cs in code in step 2 above to copy code into Module1.cs
- Click green arrow or press F5 to run program