By Sachin Kumar 
The possible variable types and their ranges :
| Variable type | Bytes of Storage | Range |
|---|---|---|
| Boolean | 1 | True or False |
| Byte | 1 | 0 to 255 |
| Currency | 8 | -922,337,203,685,477.5808 to 922,337,203,685,477.5807 |
| Date | 8 | 1 January 100 to 31 December 9999 and times from 0:00:00 to 23:59:59 |
| Decimal | 12 | -79,228,162,514,264,337,593,543,950,335 to 79,228,162,514,264,337,593,543,950,335 |
| Double | 8 | -1.79769313486232E08 to 4.94065645841247E-324 for negative values and from 4.94065645841247E-324 to 1.79769313486232E08 for positive values |
| Integer | 2 | -32,768 to 32,767 |
| Long | 4 | -2,147,483,648 to 2,147,483,647 |
| Object | 4 | N/A |
| Single | 4 | -3.402823E38 to -1.401298E-45 for negative values and from 1.401298E-45 to 3.402823E38 for positive values |
| String | N/A | A variable-length string can contain up to approximately 2 billion characters; a fixed-length string can contain 1 to approximately 64K characters. |
| User-defined data type | N/A | N/A |
| Variant | N/A | N/A |
We can define a variable: Dim varName As varType
Where varName is the name of variable and varType is the type of variable. If we don’t define the type of variable then it will the variant type variable.