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| Managing Visual Basic Data |
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Types of Visual Basic Data
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1.Numeric Data
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Numeric data are data that consists of numbers, which can be computed mathematically with various standard operators such as add, minus, multiply, divide and so on and the numeric data are divided into 7 types, they are summarized in the given table:
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|
Type |
Storage |
Range of Values |
|
1 byte |
0 to 255 |
|
|
Integer |
2 bytes |
-32,768 to 32,767 |
|
Long |
4 bytes |
-2,147,483,648 to 2,147,483,648 |
|
Single |
4 bytes |
-3.402823E+38 to -1.401298E-45 for negative values
1.401298E-45 to 3.402823E+38 for positive values. |
|
Double |
8 bytes |
-1.79769313486232e+308 to -4.94065645841247E-324
for negative values
4.94065645841247E-324 to 1.79769313486232e+308 for positive values. |
|
Currency |
8 bytes |
-922,337,203,685,477.5808 to
922,337,203,685,477.5807 |
|
Decimal |
12 bytes |
+/- 79,228,162,514,264,337,593,543,950,335 if no
decimal is use
+/- 7.9228162514264337593543950335 (28 decimal places). |
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2.Non-numeric Data Types
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the nonnumeric data types are summarized in the table which is given below:
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|
Data Type |
Storage |
Range |
|
String(fixed length) |
Length of string |
1 to 65,400 characters |
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String(variable length) |
Length + 10 bytes |
0 to 2 billion characters |
|
Date |
8 bytes |
January 1, 100 to December 31, 9999 |
|
Boolean |
2 bytes |
True or False |
|
Object |
4 bytes |
Any embedded object |
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Variant(numeric) |
16 bytes |
Any value as large as Double |
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Variant(text) |
Length+22 bytes |
Same as variable-length string |
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Declaring Variables
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In Visual Basic, one needs to declare the variables before using them by assigning names and data types and they are normally declared in the general section of the codes' windows using the Dim statement.
The format is as follows:
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Dim variableNmae as DataType
Example:
Dim password As String
Dim yourName As String
Dim firstnum As Integer
Dim secondnum As Integer
Dim total As Integer
Dim doDate As Date
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