C-Sharp ConvertToDouble Example – Code Sample Syntax
C-Sharp ConvertToDouble Example – Code Sample Syntax
Purpose: – Illustrates using C-Sharp ConvertToDouble Code Example.
Purpose:
Converts positive and negative numbers into double data type
Syntax:
Convert.ToDouble(expression)
Convert.ToDouble(expression)
Parameters | Description | expression | -1.79769313486231570E+308 through -4.94065645841246544E-324 for negative values; 4.94065645841246544E-324 through 1.79769313486231570E+308 for positive values. |
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Result Data Type | Description | double | double precision floating point number |
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Quick Example | Convert.ToDouble(1.33) // Returns 1.33 |
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Step 1: Click cs to Cut-n-paste code into clsConvertToDouble.cs
using System; public class clsConvertToDouble { public void Main() { //**************************************************************************************** // Purpose: Converts positive and negative numbers into double data type // // Syntax: Convert.ToDouble(expression) // // Parameter1: expression - -1.79769313486231570E+308 through // -4.94065645841246544E-324 for negative values; // 4.94065645841246544E-324 through // 1.79769313486231570E+308 for positive values. // // Result: double - double precision floating point number // // Quick Example: Convert.ToDouble(1.33) // Returns 1.33 // //**************************************************************************************** // This example is from http://idealprogrammer.com Console.WriteLine("Example #1: Convert.ToDouble(expression)"); double double1 = Convert.ToDouble(1.33); Console.WriteLine(double1); // Returns 1.33 //write blank line to make output easier to read Console.WriteLine(); Console.WriteLine("Example #2: Convert.ToDouble(expression)"); double Double2 = Convert.ToDouble(-3.4); Console.WriteLine(Double2); // Returns -3.4 //write blank line to make output easier to read Console.WriteLine(); Console.WriteLine("Example #3: Convert.ToDouble(expression)"); double Double3 = Convert.ToDouble(5); Console.WriteLine(Convert.ToDouble(Double3)); // Returns 5 //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 myclsConvertToDouble As New clsConvertToDouble myclsConvertToDouble.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 “ConversionFunctions”
- Right-click Functions folder in solution explorer;
- add new folder;
- name of folder could be: ConversionFunctions
- Add New subfolder named “TypeConversionFunctions”
- Right-click ConversionFunctions folder in solution explorer;
- add new folder;
- name of folder could be: TypeConversionFunctions
- Add Class Named clsConvertToDouble to TypeConversionFunctions folder
- Right-click TypeConversionFunctions folder;
- add new item;
- Select class
- Class name could be clsConvertToDouble
- Click on cs in code in step 1 above to copy code into clsConvertToDouble.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