Freetutes.com

VB6 beginners tutorial - Learn VB6

Advanced VB6 tutorial - Learn Advanced VB6

VB .NET - Learn Visual Basic .NET

Systems Analysis - System analysis and Design tutorial for Software Engineering

Browse Topics

- Getting started
- Data Types
- Modules
- Operators in VB6
- VB6 Variable
- VB6 Procedures
- VB6 Control Structures
- Loops in VB6
- VB6 Exit Do & With End With
- Arrays in VB6
- User-Defined Data Types
- VB6 Constants
-
VB6 Built-in Functions
- Date and Time in VB6
- VB6 Controls
- TextBox Control
- ComboBox & OptionButton
- Label & Frame
- PictureBox & ImageBox
- Timer Control
- ListBox & ComboBox
- VB6 ScrollBar
- Control Arrays in VB6
- Files controls in VB6
- VB6 CheckBox
- Forms in VB6
- Menus in VB6
- MDI Form in VB6
- InputBox
- MessageBox
- Mouse events
- Mouse Move
- Error Handling
-
Error Handling (2)
-
VB6 Database


You are here: Visual Basic > VB6 (Beginners Tutorial)

Previous Page | Table of Contents | Next Page

Constants, Data Type Conversion, Visual Basic Built-in Functions

Constants

Constants are named storage locations in memory, the value of which does not change during program Execution. They remain the same throughout the program execution. When the user wants to use a value that never changes, a constant can be declared and created. The Const statement is used to create a constant. Constants can be declared in local, form, module or global scope and can be public or private as for variables. Constants can be declared as illustrated below.

Public Const gravityconstant As Single = 9.81

Predefined Visual Basic Constants

The predefined constants can be used anywhere in the code in place of the actual numeric values. This makes the code easier to read and write.

For example consider a statement that will set the window state of a form to be maximized.

Form1.Windowstate = 2

The same task can be performed using a Visual Basic constant

Form1.WindowState = vbMaximized

Data Type Conversion

Visual Basic functions either to convert a string into an integer or vice versa and many more conversion functions. A complete listing of all the conversion functions offered by Visual Basic is elucidated below.

Conversion To
Function
Boolean Cbool
Byte Cbyte
Currency Ccur
Date Cdate
Decimals Cdec
Double CDbl
Integer Cint
Long CLng
Single CSng
String CStr
Variant Cvar
Error CVErr

A conversion function should always be placed at the right hand side of the calculation statement.

Visual Basic Built-in Functions

Many built-in functions are offered by Visual Basic fall under various categories. These functions are procedures that return a value. The functions fall into the following basic categories that will be discussed in the follwing sections at length.

  • Date and Time Functions

  • Format Function

  • String Functions

Related Topics


  

Previous Page | Table of Contents | Next Page

   

Home | Link to Us | About Us | Privacy Policy | Contact Us

Copyright © Freetutes.com | All Rights Reserved